forked from Snider/Poindexter
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HTML
1266 lines
No EOL
95 KiB
HTML
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<!doctype html>
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<html lang="en" class="no-js">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<meta name="description" content="Poindexter Go Library Documentation">
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<meta name="author" content="Snider">
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<link rel="prev" href="../dht-best-ping/">
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<link rel="next" href="../api/">
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<link rel="icon" href="../assets/images/favicon.png">
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<meta name="generator" content="mkdocs-1.6.1, mkdocs-material-9.7.1">
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<title>Multi-Dimensional KDTree (DHT) - Poindexter</title>
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<link rel="stylesheet" href="../assets/stylesheets/main.484c7ddc.min.css">
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<link rel="stylesheet" href="../assets/stylesheets/palette.ab4e12ef.min.css">
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<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback">
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<style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style>
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<script>__md_scope=new URL("..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script>
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</head>
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<body dir="ltr" data-md-color-scheme="default" data-md-color-primary="indigo" data-md-color-accent="indigo">
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<input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="__drawer" autocomplete="off">
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<input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search" autocomplete="off">
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<label class="md-overlay" for="__drawer"></label>
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<div data-md-component="skip">
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<a href="#kdtree-multidimensional-search-dht-peers" class="md-skip">
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Skip to content
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</a>
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</div>
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<div data-md-component="announce">
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</div>
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<header class="md-header" data-md-component="header">
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<nav class="md-header__inner md-grid" aria-label="Header">
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<a href=".." title="Poindexter" class="md-header__button md-logo" aria-label="Poindexter" data-md-component="logo">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg>
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</a>
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<label class="md-header__button md-icon" for="__drawer">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg>
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</label>
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<div class="md-header__title" data-md-component="header-title">
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<div class="md-header__ellipsis">
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<div class="md-header__topic">
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<span class="md-ellipsis">
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Poindexter
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</span>
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</div>
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<div class="md-header__topic" data-md-component="header-topic">
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<span class="md-ellipsis">
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Multi-Dimensional KDTree (DHT)
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</span>
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</div>
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</div>
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</div>
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<form class="md-header__option" data-md-component="palette">
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<input class="md-option" data-md-color-media="" data-md-color-scheme="default" data-md-color-primary="indigo" data-md-color-accent="indigo" aria-label="Switch to dark mode" type="radio" name="__palette" id="__palette_0">
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<label class="md-header__button md-icon" title="Switch to dark mode" for="__palette_1" hidden>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg>
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</label>
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<input class="md-option" data-md-color-media="" data-md-color-scheme="slate" data-md-color-primary="indigo" data-md-color-accent="indigo" aria-label="Switch to light mode" type="radio" name="__palette" id="__palette_1">
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<label class="md-header__button md-icon" title="Switch to light mode" for="__palette_0" hidden>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg>
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</label>
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</form>
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<script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script>
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<label class="md-header__button md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg>
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</label>
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<div class="md-search" data-md-component="search" role="dialog">
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<label class="md-search__overlay" for="__search"></label>
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<div class="md-search__inner" role="search">
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<form class="md-search__form" name="search">
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<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" required>
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<label class="md-search__icon md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11z"/></svg>
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</label>
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<nav class="md-search__options" aria-label="Search">
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<button type="reset" class="md-search__icon md-icon" title="Clear" aria-label="Clear" tabindex="-1">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M19 6.41 17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z"/></svg>
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</button>
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</nav>
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<div class="md-search__suggest" data-md-component="search-suggest"></div>
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</form>
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<div class="md-search__output">
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<div class="md-search__scrollwrap" tabindex="0" data-md-scrollfix>
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<div class="md-search-result" data-md-component="search-result">
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<div class="md-search-result__meta">
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Initializing search
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</div>
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<ol class="md-search-result__list" role="presentation"></ol>
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</div>
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</div>
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</div>
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</div>
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</div>
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<div class="md-header__source">
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<a href="https://github.com/Snider/Poindexter" title="Go to repository" class="md-source" data-md-component="source">
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<div class="md-source__icon md-icon">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M439.6 236.1 244 40.5c-5.4-5.5-12.8-8.5-20.4-8.5s-15 3-20.4 8.4L162.5 81l51.5 51.5c27.1-9.1 52.7 16.8 43.4 43.7l49.7 49.7c34.2-11.8 61.2 31 35.5 56.7-26.5 26.5-70.2-2.9-56-37.3L240.3 199v121.9c25.3 12.5 22.3 41.8 9.1 55-6.4 6.4-15.2 10.1-24.3 10.1s-17.8-3.6-24.3-10.1c-17.6-17.6-11.1-46.9 11.2-56v-123c-20.8-8.5-24.6-30.7-18.6-45L142.6 101 8.5 235.1C3 240.6 0 247.9 0 255.5s3 15 8.5 20.4l195.6 195.7c5.4 5.4 12.7 8.4 20.4 8.4s15-3 20.4-8.4l194.7-194.7c5.4-5.4 8.4-12.8 8.4-20.4s-3-15-8.4-20.4"/></svg>
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</div>
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<div class="md-source__repository">
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Snider/Poindexter
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</div>
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</a>
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</div>
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</nav>
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</header>
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<div class="md-container" data-md-component="container">
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<nav class="md-tabs" aria-label="Tabs" data-md-component="tabs">
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<div class="md-grid">
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<ul class="md-tabs__list">
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<li class="md-tabs__item">
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<a href=".." class="md-tabs__link">
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Home
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../getting-started/" class="md-tabs__link">
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Getting Started
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../wasm/" class="md-tabs__link">
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WebAssembly (Browser)
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</a>
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</li>
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<li class="md-tabs__item md-tabs__item--active">
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<a href="../dht-best-ping/" class="md-tabs__link">
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Examples
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../api/" class="md-tabs__link">
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API Reference
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||
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../perf/" class="md-tabs__link">
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Performance
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../license/" class="md-tabs__link">
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License
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</a>
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</li>
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</ul>
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</div>
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</nav>
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<main class="md-main" data-md-component="main">
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<div class="md-main__inner md-grid">
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<div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
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<div class="md-sidebar__scrollwrap">
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<div class="md-sidebar__inner">
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<nav class="md-nav md-nav--primary md-nav--lifted" aria-label="Navigation" data-md-level="0">
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<label class="md-nav__title" for="__drawer">
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<a href=".." title="Poindexter" class="md-nav__button md-logo" aria-label="Poindexter" data-md-component="logo">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg>
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</a>
|
||
Poindexter
|
||
</label>
|
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<div class="md-nav__source">
|
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<a href="https://github.com/Snider/Poindexter" title="Go to repository" class="md-source" data-md-component="source">
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<div class="md-source__icon md-icon">
|
||
|
||
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M439.6 236.1 244 40.5c-5.4-5.5-12.8-8.5-20.4-8.5s-15 3-20.4 8.4L162.5 81l51.5 51.5c27.1-9.1 52.7 16.8 43.4 43.7l49.7 49.7c34.2-11.8 61.2 31 35.5 56.7-26.5 26.5-70.2-2.9-56-37.3L240.3 199v121.9c25.3 12.5 22.3 41.8 9.1 55-6.4 6.4-15.2 10.1-24.3 10.1s-17.8-3.6-24.3-10.1c-17.6-17.6-11.1-46.9 11.2-56v-123c-20.8-8.5-24.6-30.7-18.6-45L142.6 101 8.5 235.1C3 240.6 0 247.9 0 255.5s3 15 8.5 20.4l195.6 195.7c5.4 5.4 12.7 8.4 20.4 8.4s15-3 20.4-8.4l194.7-194.7c5.4-5.4 8.4-12.8 8.4-20.4s-3-15-8.4-20.4"/></svg>
|
||
</div>
|
||
<div class="md-source__repository">
|
||
Snider/Poindexter
|
||
</div>
|
||
</a>
|
||
</div>
|
||
|
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<ul class="md-nav__list" data-md-scrollfix>
|
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<li class="md-nav__item">
|
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<a href=".." class="md-nav__link">
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<span class="md-ellipsis">
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Home
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</span>
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</a>
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</li>
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|
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<li class="md-nav__item">
|
||
<a href="../getting-started/" class="md-nav__link">
|
||
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<span class="md-ellipsis">
|
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|
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|
||
Getting Started
|
||
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</span>
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|
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</a>
|
||
</li>
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<li class="md-nav__item">
|
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<a href="../wasm/" class="md-nav__link">
|
||
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<span class="md-ellipsis">
|
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|
||
WebAssembly (Browser)
|
||
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||
</span>
|
||
|
||
|
||
|
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</a>
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</li>
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<li class="md-nav__item md-nav__item--active md-nav__item--section md-nav__item--nested">
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_4" checked>
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<label class="md-nav__link" for="__nav_4" id="__nav_4_label" tabindex="">
|
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Examples
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Examples
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|
||
<a href="../dht-best-ping/" class="md-nav__link">
|
||
|
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|
||
|
||
<span class="md-ellipsis">
|
||
|
||
|
||
Best Ping Peer (DHT)
|
||
|
||
|
||
|
||
</span>
|
||
|
||
|
||
|
||
</a>
|
||
</li>
|
||
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||
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|
||
Multi-Dimensional KDTree (DHT)
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Multi-Dimensional KDTree (DHT)
|
||
|
||
|
||
|
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Normalization and weights
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|
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|
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|
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|
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<span class="md-ellipsis">
|
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|
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2‑D: Ping + Hop
|
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|
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|
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</a>
|
||
|
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|
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|
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|
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<a href="#3d-ping-hop-geo" class="md-nav__link">
|
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<span class="md-ellipsis">
|
||
|
||
3‑D: Ping + Hop + Geo
|
||
|
||
</span>
|
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</a>
|
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Dynamic updates
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|
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|
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|
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Choosing a metric
|
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Notes on production use
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API Reference
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Performance
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Normalization and weights
|
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|
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2‑D: Ping + Hop
|
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</a>
|
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3‑D: Ping + Hop + Geo
|
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|
||
<h1 id="kdtree-multidimensional-search-dht-peers">KDTree: Multi‑Dimensional Search (DHT peers)</h1>
|
||
<p>This example extends the single‑dimension "best ping" demo to a realistic multi‑dimensional selection:</p>
|
||
<ul>
|
||
<li>ping_ms (lower is better)</li>
|
||
<li>hop_count (lower is better)</li>
|
||
<li>geo_distance_km (lower is better)</li>
|
||
<li>score (higher is better — e.g., capacity/reputation)</li>
|
||
</ul>
|
||
<p>We will:
|
||
- Build 4‑D points over these features
|
||
- Run <code>Nearest</code>, <code>KNearest</code>, and <code>Radius</code> queries
|
||
- Show subsets: ping+hop (2‑D) and ping+hop+geo (3‑D)
|
||
- Demonstrate weighting/normalization to balance disparate units</p>
|
||
<blockquote>
|
||
<p>Tip: KDTree distances are geometric. Mixing units (ms, hops, km, arbitrary score) requires scaling so that each axis contributes proportionally to your decision policy.</p>
|
||
</blockquote>
|
||
<h2 id="dataset">Dataset</h2>
|
||
<p>We’ll use a small, made‑up set of DHT peers in each runnable example below. Each example declares its own <code>Peer</code> type and dataset so you can copy‑paste and run independently.</p>
|
||
<h2 id="normalization-and-weights">Normalization and weights</h2>
|
||
<p>To make heterogeneous units comparable (ms, hops, km, score), use the library helpers which:
|
||
- Min‑max normalize each axis to [0,1] over your provided dataset
|
||
- Optionally invert axes where “higher is better” so they become “lower cost”
|
||
- Apply per‑axis weights so you can emphasize what matters</p>
|
||
<p>Build 4‑D points and query them with helpers (full program):</p>
|
||
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">package</span><span class="w"> </span><span class="nx">main</span>
|
||
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>
|
||
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="kn">import</span><span class="w"> </span><span class="p">(</span>
|
||
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="w"> </span><span class="s">"fmt"</span>
|
||
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="w"> </span><span class="nx">poindexter</span><span class="w"> </span><span class="s">"github.com/Snider/Poindexter"</span>
|
||
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="p">)</span>
|
||
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a>
|
||
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="kd">type</span><span class="w"> </span><span class="nx">Peer</span><span class="w"> </span><span class="kd">struct</span><span class="w"> </span><span class="p">{</span>
|
||
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="w"> </span><span class="nx">ID</span><span class="w"> </span><span class="kt">string</span>
|
||
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="w"> </span><span class="nx">PingMS</span><span class="w"> </span><span class="kt">float64</span>
|
||
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="w"> </span><span class="nx">Hops</span><span class="w"> </span><span class="kt">float64</span>
|
||
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="w"> </span><span class="nx">GeoKM</span><span class="w"> </span><span class="kt">float64</span>
|
||
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="w"> </span><span class="nx">Score</span><span class="w"> </span><span class="kt">float64</span>
|
||
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="p">}</span>
|
||
<a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a>
|
||
<a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="kd">var</span><span class="w"> </span><span class="nx">peers</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">[]</span><span class="nx">Peer</span><span class="p">{</span>
|
||
<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"A"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">22</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="nx">GeoKM</span><span class="p">:</span><span class="w"> </span><span class="mi">1200</span><span class="p">,</span><span class="w"> </span><span class="nx">Score</span><span class="p">:</span><span class="w"> </span><span class="mf">0.86</span><span class="p">},</span>
|
||
<a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"B"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">34</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="nx">GeoKM</span><span class="p">:</span><span class="w"> </span><span class="mi">800</span><span class="p">,</span><span class="w"> </span><span class="nx">Score</span><span class="p">:</span><span class="w"> </span><span class="mf">0.91</span><span class="p">},</span>
|
||
<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"C"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">15</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">4</span><span class="p">,</span><span class="w"> </span><span class="nx">GeoKM</span><span class="p">:</span><span class="w"> </span><span class="mi">4500</span><span class="p">,</span><span class="w"> </span><span class="nx">Score</span><span class="p">:</span><span class="w"> </span><span class="mf">0.70</span><span class="p">},</span>
|
||
<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"D"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">55</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="nx">GeoKM</span><span class="p">:</span><span class="w"> </span><span class="mi">300</span><span class="p">,</span><span class="w"> </span><span class="nx">Score</span><span class="p">:</span><span class="w"> </span><span class="mf">0.95</span><span class="p">},</span>
|
||
<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"E"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">18</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="nx">GeoKM</span><span class="p">:</span><span class="w"> </span><span class="mi">2200</span><span class="p">,</span><span class="w"> </span><span class="nx">Score</span><span class="p">:</span><span class="w"> </span><span class="mf">0.80</span><span class="p">},</span>
|
||
<a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a><span class="p">}</span>
|
||
<a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a>
|
||
<a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a><span class="kd">func</span><span class="w"> </span><span class="nx">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
|
||
<a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a><span class="w"> </span><span class="c1">// Build 4‑D KDTree using Euclidean (L2)</span>
|
||
<a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a><span class="w"> </span><span class="nx">weights4</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="p">[</span><span class="mi">4</span><span class="p">]</span><span class="kt">float64</span><span class="p">{</span><span class="mf">1.0</span><span class="p">,</span><span class="w"> </span><span class="mf">0.7</span><span class="p">,</span><span class="w"> </span><span class="mf">0.2</span><span class="p">,</span><span class="w"> </span><span class="mf">1.2</span><span class="p">}</span>
|
||
<a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a><span class="w"> </span><span class="nx">invert4</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="p">[</span><span class="mi">4</span><span class="p">]</span><span class="kt">bool</span><span class="p">{</span><span class="kc">false</span><span class="p">,</span><span class="w"> </span><span class="kc">false</span><span class="p">,</span><span class="w"> </span><span class="kc">false</span><span class="p">,</span><span class="w"> </span><span class="kc">true</span><span class="p">}</span><span class="w"> </span><span class="c1">// invert score (higher is better)</span>
|
||
<a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a><span class="w"> </span><span class="nx">pts</span><span class="p">,</span><span class="w"> </span><span class="nx">err</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">Build4D</span><span class="p">(</span>
|
||
<a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></a><span class="w"> </span><span class="nx">peers</span><span class="p">,</span>
|
||
<a id="__codelineno-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">string</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">ID</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">PingMS</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-0-32" name="__codelineno-0-32" href="#__codelineno-0-32"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">Hops</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-0-33" name="__codelineno-0-33" href="#__codelineno-0-33"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">GeoKM</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-0-34" name="__codelineno-0-34" href="#__codelineno-0-34"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">Score</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-0-35" name="__codelineno-0-35" href="#__codelineno-0-35"></a><span class="w"> </span><span class="nx">weights4</span><span class="p">,</span><span class="w"> </span><span class="nx">invert4</span><span class="p">,</span>
|
||
<a id="__codelineno-0-36" name="__codelineno-0-36" href="#__codelineno-0-36"></a><span class="w"> </span><span class="p">)</span>
|
||
<a id="__codelineno-0-37" name="__codelineno-0-37" href="#__codelineno-0-37"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="nx">err</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">nil</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nb">panic</span><span class="p">(</span><span class="nx">err</span><span class="p">)</span><span class="w"> </span><span class="p">}</span>
|
||
<a id="__codelineno-0-38" name="__codelineno-0-38" href="#__codelineno-0-38"></a><span class="w"> </span><span class="nx">tree</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">NewKDTree</span><span class="p">(</span><span class="nx">pts</span><span class="p">,</span><span class="w"> </span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">WithMetric</span><span class="p">(</span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">EuclideanDistance</span><span class="p">{}))</span>
|
||
<a id="__codelineno-0-39" name="__codelineno-0-39" href="#__codelineno-0-39"></a>
|
||
<a id="__codelineno-0-40" name="__codelineno-0-40" href="#__codelineno-0-40"></a><span class="w"> </span><span class="c1">// Query target preferences (construct a query in normalized/weighted space)</span>
|
||
<a id="__codelineno-0-41" name="__codelineno-0-41" href="#__codelineno-0-41"></a><span class="w"> </span><span class="c1">// Example: seek very low ping, low hops, moderate geo, high score (low score_cost)</span>
|
||
<a id="__codelineno-0-42" name="__codelineno-0-42" href="#__codelineno-0-42"></a><span class="w"> </span><span class="nx">query</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="p">[]</span><span class="kt">float64</span><span class="p">{</span><span class="nx">weights4</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">*</span><span class="mf">0.0</span><span class="p">,</span><span class="w"> </span><span class="nx">weights4</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">*</span><span class="mf">0.2</span><span class="p">,</span><span class="w"> </span><span class="nx">weights4</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="o">*</span><span class="mf">0.3</span><span class="p">,</span><span class="w"> </span><span class="nx">weights4</span><span class="p">[</span><span class="mi">3</span><span class="p">]</span><span class="o">*</span><span class="mf">0.0</span><span class="p">}</span>
|
||
<a id="__codelineno-0-43" name="__codelineno-0-43" href="#__codelineno-0-43"></a>
|
||
<a id="__codelineno-0-44" name="__codelineno-0-44" href="#__codelineno-0-44"></a><span class="w"> </span><span class="c1">// 1‑NN</span>
|
||
<a id="__codelineno-0-45" name="__codelineno-0-45" href="#__codelineno-0-45"></a><span class="w"> </span><span class="nx">best</span><span class="p">,</span><span class="w"> </span><span class="nx">dist</span><span class="p">,</span><span class="w"> </span><span class="nx">ok</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">tree</span><span class="p">.</span><span class="nx">Nearest</span><span class="p">(</span><span class="nx">query</span><span class="p">)</span>
|
||
<a id="__codelineno-0-46" name="__codelineno-0-46" href="#__codelineno-0-46"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="nx">ok</span><span class="w"> </span><span class="p">{</span>
|
||
<a id="__codelineno-0-47" name="__codelineno-0-47" href="#__codelineno-0-47"></a><span class="w"> </span><span class="nx">fmt</span><span class="p">.</span><span class="nx">Printf</span><span class="p">(</span><span class="s">"Best peer: %s (dist=%.4f)\n"</span><span class="p">,</span><span class="w"> </span><span class="nx">best</span><span class="p">.</span><span class="nx">ID</span><span class="p">,</span><span class="w"> </span><span class="nx">dist</span><span class="p">)</span>
|
||
<a id="__codelineno-0-48" name="__codelineno-0-48" href="#__codelineno-0-48"></a><span class="w"> </span><span class="p">}</span>
|
||
<a id="__codelineno-0-49" name="__codelineno-0-49" href="#__codelineno-0-49"></a>
|
||
<a id="__codelineno-0-50" name="__codelineno-0-50" href="#__codelineno-0-50"></a><span class="w"> </span><span class="c1">// k‑NN (top 3)</span>
|
||
<a id="__codelineno-0-51" name="__codelineno-0-51" href="#__codelineno-0-51"></a><span class="w"> </span><span class="nx">neigh</span><span class="p">,</span><span class="w"> </span><span class="nx">dists</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">tree</span><span class="p">.</span><span class="nx">KNearest</span><span class="p">(</span><span class="nx">query</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">)</span>
|
||
<a id="__codelineno-0-52" name="__codelineno-0-52" href="#__codelineno-0-52"></a><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="nx">i</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="k">range</span><span class="w"> </span><span class="nx">neigh</span><span class="w"> </span><span class="p">{</span>
|
||
<a id="__codelineno-0-53" name="__codelineno-0-53" href="#__codelineno-0-53"></a><span class="w"> </span><span class="nx">fmt</span><span class="p">.</span><span class="nx">Printf</span><span class="p">(</span><span class="s">"%d) %s dist=%.4f\n"</span><span class="p">,</span><span class="w"> </span><span class="nx">i</span><span class="o">+</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="nx">neigh</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">ID</span><span class="p">,</span><span class="w"> </span><span class="nx">dists</span><span class="p">[</span><span class="nx">i</span><span class="p">])</span>
|
||
<a id="__codelineno-0-54" name="__codelineno-0-54" href="#__codelineno-0-54"></a><span class="w"> </span><span class="p">}</span>
|
||
<a id="__codelineno-0-55" name="__codelineno-0-55" href="#__codelineno-0-55"></a>
|
||
<a id="__codelineno-0-56" name="__codelineno-0-56" href="#__codelineno-0-56"></a><span class="w"> </span><span class="c1">// Radius query</span>
|
||
<a id="__codelineno-0-57" name="__codelineno-0-57" href="#__codelineno-0-57"></a><span class="w"> </span><span class="nx">within</span><span class="p">,</span><span class="w"> </span><span class="nx">wd</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">tree</span><span class="p">.</span><span class="nx">Radius</span><span class="p">(</span><span class="nx">query</span><span class="p">,</span><span class="w"> </span><span class="mf">0.35</span><span class="p">)</span>
|
||
<a id="__codelineno-0-58" name="__codelineno-0-58" href="#__codelineno-0-58"></a><span class="w"> </span><span class="nx">fmt</span><span class="p">.</span><span class="nx">Printf</span><span class="p">(</span><span class="s">"Within radius 0.35: "</span><span class="p">)</span>
|
||
<a id="__codelineno-0-59" name="__codelineno-0-59" href="#__codelineno-0-59"></a><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="nx">i</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="k">range</span><span class="w"> </span><span class="nx">within</span><span class="w"> </span><span class="p">{</span>
|
||
<a id="__codelineno-0-60" name="__codelineno-0-60" href="#__codelineno-0-60"></a><span class="w"> </span><span class="nx">fmt</span><span class="p">.</span><span class="nx">Printf</span><span class="p">(</span><span class="s">"%s(%.3f) "</span><span class="p">,</span><span class="w"> </span><span class="nx">within</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">ID</span><span class="p">,</span><span class="w"> </span><span class="nx">wd</span><span class="p">[</span><span class="nx">i</span><span class="p">])</span>
|
||
<a id="__codelineno-0-61" name="__codelineno-0-61" href="#__codelineno-0-61"></a><span class="w"> </span><span class="p">}</span>
|
||
<a id="__codelineno-0-62" name="__codelineno-0-62" href="#__codelineno-0-62"></a><span class="w"> </span><span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span><span class="p">()</span>
|
||
<a id="__codelineno-0-63" name="__codelineno-0-63" href="#__codelineno-0-63"></a><span class="p">}</span>
|
||
</code></pre></div>
|
||
<h2 id="2d-ping-hop">2‑D: Ping + Hop</h2>
|
||
<p>Sometimes you want a strict trade‑off between just latency and path length. Build 2‑D points using helpers:</p>
|
||
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kn">package</span><span class="w"> </span><span class="nx">main</span>
|
||
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>
|
||
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="kn">import</span><span class="w"> </span><span class="p">(</span>
|
||
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w"> </span><span class="s">"fmt"</span>
|
||
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w"> </span><span class="nx">poindexter</span><span class="w"> </span><span class="s">"github.com/Snider/Poindexter"</span>
|
||
<a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="p">)</span>
|
||
<a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a>
|
||
<a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="kd">type</span><span class="w"> </span><span class="nx">Peer</span><span class="w"> </span><span class="kd">struct</span><span class="w"> </span><span class="p">{</span>
|
||
<a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="w"> </span><span class="nx">ID</span><span class="w"> </span><span class="kt">string</span>
|
||
<a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="w"> </span><span class="nx">PingMS</span><span class="w"> </span><span class="kt">float64</span>
|
||
<a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a><span class="w"> </span><span class="nx">Hops</span><span class="w"> </span><span class="kt">float64</span>
|
||
<a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a><span class="p">}</span>
|
||
<a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a>
|
||
<a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></a><span class="kd">var</span><span class="w"> </span><span class="nx">peers</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">[]</span><span class="nx">Peer</span><span class="p">{</span>
|
||
<a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"A"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">22</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">3</span><span class="p">},</span>
|
||
<a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"B"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">34</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">},</span>
|
||
<a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"C"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">15</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">4</span><span class="p">},</span>
|
||
<a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"D"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">55</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">},</span>
|
||
<a id="__codelineno-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"E"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">18</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">},</span>
|
||
<a id="__codelineno-1-20" name="__codelineno-1-20" href="#__codelineno-1-20"></a><span class="p">}</span>
|
||
<a id="__codelineno-1-21" name="__codelineno-1-21" href="#__codelineno-1-21"></a>
|
||
<a id="__codelineno-1-22" name="__codelineno-1-22" href="#__codelineno-1-22"></a><span class="kd">func</span><span class="w"> </span><span class="nx">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
|
||
<a id="__codelineno-1-23" name="__codelineno-1-23" href="#__codelineno-1-23"></a><span class="w"> </span><span class="nx">weights2</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="kt">float64</span><span class="p">{</span><span class="mf">1.0</span><span class="p">,</span><span class="w"> </span><span class="mf">1.0</span><span class="p">}</span>
|
||
<a id="__codelineno-1-24" name="__codelineno-1-24" href="#__codelineno-1-24"></a><span class="w"> </span><span class="nx">invert2</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="kt">bool</span><span class="p">{</span><span class="kc">false</span><span class="p">,</span><span class="w"> </span><span class="kc">false</span><span class="p">}</span>
|
||
<a id="__codelineno-1-25" name="__codelineno-1-25" href="#__codelineno-1-25"></a>
|
||
<a id="__codelineno-1-26" name="__codelineno-1-26" href="#__codelineno-1-26"></a><span class="w"> </span><span class="nx">pts2</span><span class="p">,</span><span class="w"> </span><span class="nx">err</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">Build2D</span><span class="p">(</span>
|
||
<a id="__codelineno-1-27" name="__codelineno-1-27" href="#__codelineno-1-27"></a><span class="w"> </span><span class="nx">peers</span><span class="p">,</span>
|
||
<a id="__codelineno-1-28" name="__codelineno-1-28" href="#__codelineno-1-28"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">string</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">ID</span><span class="w"> </span><span class="p">},</span><span class="w"> </span><span class="c1">// id</span>
|
||
<a id="__codelineno-1-29" name="__codelineno-1-29" href="#__codelineno-1-29"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">PingMS</span><span class="w"> </span><span class="p">},</span><span class="c1">// f1: ping</span>
|
||
<a id="__codelineno-1-30" name="__codelineno-1-30" href="#__codelineno-1-30"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">Hops</span><span class="w"> </span><span class="p">},</span><span class="w"> </span><span class="c1">// f2: hops</span>
|
||
<a id="__codelineno-1-31" name="__codelineno-1-31" href="#__codelineno-1-31"></a><span class="w"> </span><span class="nx">weights2</span><span class="p">,</span><span class="w"> </span><span class="nx">invert2</span><span class="p">,</span>
|
||
<a id="__codelineno-1-32" name="__codelineno-1-32" href="#__codelineno-1-32"></a><span class="w"> </span><span class="p">)</span>
|
||
<a id="__codelineno-1-33" name="__codelineno-1-33" href="#__codelineno-1-33"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="nx">err</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">nil</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nb">panic</span><span class="p">(</span><span class="nx">err</span><span class="p">)</span><span class="w"> </span><span class="p">}</span>
|
||
<a id="__codelineno-1-34" name="__codelineno-1-34" href="#__codelineno-1-34"></a>
|
||
<a id="__codelineno-1-35" name="__codelineno-1-35" href="#__codelineno-1-35"></a><span class="w"> </span><span class="nx">tree2</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">NewKDTree</span><span class="p">(</span><span class="nx">pts2</span><span class="p">,</span><span class="w"> </span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">WithMetric</span><span class="p">(</span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">ManhattanDistance</span><span class="p">{}))</span><span class="w"> </span><span class="c1">// L1 favors axis‑aligned tradeoffs</span>
|
||
<a id="__codelineno-1-36" name="__codelineno-1-36" href="#__codelineno-1-36"></a><span class="w"> </span><span class="c1">// Prefer very low ping, modest hops</span>
|
||
<a id="__codelineno-1-37" name="__codelineno-1-37" href="#__codelineno-1-37"></a><span class="w"> </span><span class="nx">query2</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="p">[]</span><span class="kt">float64</span><span class="p">{</span><span class="nx">weights2</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">*</span><span class="mf">0.0</span><span class="p">,</span><span class="w"> </span><span class="nx">weights2</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">*</span><span class="mf">0.3</span><span class="p">}</span>
|
||
<a id="__codelineno-1-38" name="__codelineno-1-38" href="#__codelineno-1-38"></a><span class="w"> </span><span class="nx">best2</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">tree2</span><span class="p">.</span><span class="nx">Nearest</span><span class="p">(</span><span class="nx">query2</span><span class="p">)</span>
|
||
<a id="__codelineno-1-39" name="__codelineno-1-39" href="#__codelineno-1-39"></a><span class="w"> </span><span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="s">"2D best (ping+hop):"</span><span class="p">,</span><span class="w"> </span><span class="nx">best2</span><span class="p">.</span><span class="nx">ID</span><span class="p">)</span>
|
||
<a id="__codelineno-1-40" name="__codelineno-1-40" href="#__codelineno-1-40"></a><span class="p">}</span>
|
||
</code></pre></div>
|
||
<h2 id="3d-ping-hop-geo">3‑D: Ping + Hop + Geo</h2>
|
||
<p>Add geography to discourage far peers when latency is similar. Use the 3‑D helper:</p>
|
||
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="kn">package</span><span class="w"> </span><span class="nx">main</span>
|
||
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>
|
||
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="kn">import</span><span class="w"> </span><span class="p">(</span>
|
||
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w"> </span><span class="s">"fmt"</span>
|
||
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="nx">poindexter</span><span class="w"> </span><span class="s">"github.com/Snider/Poindexter"</span>
|
||
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="p">)</span>
|
||
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a>
|
||
<a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="kd">type</span><span class="w"> </span><span class="nx">Peer</span><span class="w"> </span><span class="kd">struct</span><span class="w"> </span><span class="p">{</span>
|
||
<a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a><span class="w"> </span><span class="nx">ID</span><span class="w"> </span><span class="kt">string</span>
|
||
<a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a><span class="w"> </span><span class="nx">PingMS</span><span class="w"> </span><span class="kt">float64</span>
|
||
<a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a><span class="w"> </span><span class="nx">Hops</span><span class="w"> </span><span class="kt">float64</span>
|
||
<a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a><span class="w"> </span><span class="nx">GeoKM</span><span class="w"> </span><span class="kt">float64</span>
|
||
<a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a><span class="p">}</span>
|
||
<a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a>
|
||
<a id="__codelineno-2-15" name="__codelineno-2-15" href="#__codelineno-2-15"></a><span class="kd">var</span><span class="w"> </span><span class="nx">peers</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">[]</span><span class="nx">Peer</span><span class="p">{</span>
|
||
<a id="__codelineno-2-16" name="__codelineno-2-16" href="#__codelineno-2-16"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"A"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">22</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="nx">GeoKM</span><span class="p">:</span><span class="w"> </span><span class="mi">1200</span><span class="p">},</span>
|
||
<a id="__codelineno-2-17" name="__codelineno-2-17" href="#__codelineno-2-17"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"B"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">34</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="nx">GeoKM</span><span class="p">:</span><span class="w"> </span><span class="mi">800</span><span class="p">},</span>
|
||
<a id="__codelineno-2-18" name="__codelineno-2-18" href="#__codelineno-2-18"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"C"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">15</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">4</span><span class="p">,</span><span class="w"> </span><span class="nx">GeoKM</span><span class="p">:</span><span class="w"> </span><span class="mi">4500</span><span class="p">},</span>
|
||
<a id="__codelineno-2-19" name="__codelineno-2-19" href="#__codelineno-2-19"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"D"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">55</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="nx">GeoKM</span><span class="p">:</span><span class="w"> </span><span class="mi">300</span><span class="p">},</span>
|
||
<a id="__codelineno-2-20" name="__codelineno-2-20" href="#__codelineno-2-20"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"E"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">18</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="nx">GeoKM</span><span class="p">:</span><span class="w"> </span><span class="mi">2200</span><span class="p">},</span>
|
||
<a id="__codelineno-2-21" name="__codelineno-2-21" href="#__codelineno-2-21"></a><span class="p">}</span>
|
||
<a id="__codelineno-2-22" name="__codelineno-2-22" href="#__codelineno-2-22"></a>
|
||
<a id="__codelineno-2-23" name="__codelineno-2-23" href="#__codelineno-2-23"></a><span class="kd">func</span><span class="w"> </span><span class="nx">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
|
||
<a id="__codelineno-2-24" name="__codelineno-2-24" href="#__codelineno-2-24"></a><span class="w"> </span><span class="nx">weights3</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="p">[</span><span class="mi">3</span><span class="p">]</span><span class="kt">float64</span><span class="p">{</span><span class="mf">1.0</span><span class="p">,</span><span class="w"> </span><span class="mf">0.7</span><span class="p">,</span><span class="w"> </span><span class="mf">0.3</span><span class="p">}</span>
|
||
<a id="__codelineno-2-25" name="__codelineno-2-25" href="#__codelineno-2-25"></a><span class="w"> </span><span class="nx">invert3</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="p">[</span><span class="mi">3</span><span class="p">]</span><span class="kt">bool</span><span class="p">{</span><span class="kc">false</span><span class="p">,</span><span class="w"> </span><span class="kc">false</span><span class="p">,</span><span class="w"> </span><span class="kc">false</span><span class="p">}</span>
|
||
<a id="__codelineno-2-26" name="__codelineno-2-26" href="#__codelineno-2-26"></a>
|
||
<a id="__codelineno-2-27" name="__codelineno-2-27" href="#__codelineno-2-27"></a><span class="w"> </span><span class="nx">pts3</span><span class="p">,</span><span class="w"> </span><span class="nx">err</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">Build3D</span><span class="p">(</span>
|
||
<a id="__codelineno-2-28" name="__codelineno-2-28" href="#__codelineno-2-28"></a><span class="w"> </span><span class="nx">peers</span><span class="p">,</span>
|
||
<a id="__codelineno-2-29" name="__codelineno-2-29" href="#__codelineno-2-29"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">string</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">ID</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-2-30" name="__codelineno-2-30" href="#__codelineno-2-30"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">PingMS</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-2-31" name="__codelineno-2-31" href="#__codelineno-2-31"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">Hops</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-2-32" name="__codelineno-2-32" href="#__codelineno-2-32"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">GeoKM</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-2-33" name="__codelineno-2-33" href="#__codelineno-2-33"></a><span class="w"> </span><span class="nx">weights3</span><span class="p">,</span><span class="w"> </span><span class="nx">invert3</span><span class="p">,</span>
|
||
<a id="__codelineno-2-34" name="__codelineno-2-34" href="#__codelineno-2-34"></a><span class="w"> </span><span class="p">)</span>
|
||
<a id="__codelineno-2-35" name="__codelineno-2-35" href="#__codelineno-2-35"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="nx">err</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">nil</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nb">panic</span><span class="p">(</span><span class="nx">err</span><span class="p">)</span><span class="w"> </span><span class="p">}</span>
|
||
<a id="__codelineno-2-36" name="__codelineno-2-36" href="#__codelineno-2-36"></a>
|
||
<a id="__codelineno-2-37" name="__codelineno-2-37" href="#__codelineno-2-37"></a><span class="w"> </span><span class="nx">tree3</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">NewKDTree</span><span class="p">(</span><span class="nx">pts3</span><span class="p">,</span><span class="w"> </span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">WithMetric</span><span class="p">(</span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">EuclideanDistance</span><span class="p">{}))</span>
|
||
<a id="__codelineno-2-38" name="__codelineno-2-38" href="#__codelineno-2-38"></a><span class="w"> </span><span class="c1">// Prefer low ping/hop, modest geo</span>
|
||
<a id="__codelineno-2-39" name="__codelineno-2-39" href="#__codelineno-2-39"></a><span class="w"> </span><span class="nx">query3</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="p">[]</span><span class="kt">float64</span><span class="p">{</span><span class="nx">weights3</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">*</span><span class="mf">0.0</span><span class="p">,</span><span class="w"> </span><span class="nx">weights3</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">*</span><span class="mf">0.2</span><span class="p">,</span><span class="w"> </span><span class="nx">weights3</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="o">*</span><span class="mf">0.4</span><span class="p">}</span>
|
||
<a id="__codelineno-2-40" name="__codelineno-2-40" href="#__codelineno-2-40"></a><span class="w"> </span><span class="nx">top3</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">tree3</span><span class="p">.</span><span class="nx">Nearest</span><span class="p">(</span><span class="nx">query3</span><span class="p">)</span>
|
||
<a id="__codelineno-2-41" name="__codelineno-2-41" href="#__codelineno-2-41"></a><span class="w"> </span><span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="s">"3D best (ping+hop+geo):"</span><span class="p">,</span><span class="w"> </span><span class="nx">top3</span><span class="p">.</span><span class="nx">ID</span><span class="p">)</span>
|
||
<a id="__codelineno-2-42" name="__codelineno-2-42" href="#__codelineno-2-42"></a><span class="p">}</span>
|
||
</code></pre></div>
|
||
<h2 id="dynamic-updates">Dynamic updates</h2>
|
||
<p>Your routing table changes constantly. Insert/remove peers. For consistent normalization, compute and reuse your min/max stats (preferred) or rebuild points when the candidate set changes.</p>
|
||
<p>Tip: Use the WithStats helpers to reuse normalization across updates:</p>
|
||
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="c1">// Compute once over your baseline</span>
|
||
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="nx">stats</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">ComputeNormStats2D</span><span class="p">(</span><span class="nx">peers</span><span class="p">,</span>
|
||
<a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">PingMS</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">Hops</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="p">)</span>
|
||
<a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a>
|
||
<a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a><span class="c1">// Build now or later using the same stats</span>
|
||
<a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="nx">ts</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">Build2DWithStats</span><span class="p">(</span>
|
||
<a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a><span class="w"> </span><span class="nx">peers</span><span class="p">,</span>
|
||
<a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">string</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">ID</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">PingMS</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-3-12" name="__codelineno-3-12" href="#__codelineno-3-12"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">Hops</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-3-13" name="__codelineno-3-13" href="#__codelineno-3-13"></a><span class="w"> </span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="kt">float64</span><span class="p">{</span><span class="mi">1</span><span class="p">,</span><span class="mi">1</span><span class="p">},</span><span class="w"> </span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="kt">bool</span><span class="p">{</span><span class="kc">false</span><span class="p">,</span><span class="kc">false</span><span class="p">},</span><span class="w"> </span><span class="nx">stats</span><span class="p">,</span>
|
||
<a id="__codelineno-3-14" name="__codelineno-3-14" href="#__codelineno-3-14"></a><span class="p">)</span>
|
||
</code></pre></div>
|
||
<div class="highlight"><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="kn">package</span><span class="w"> </span><span class="nx">main</span>
|
||
<a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a>
|
||
<a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a><span class="kn">import</span><span class="w"> </span><span class="p">(</span>
|
||
<a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a><span class="w"> </span><span class="s">"fmt"</span>
|
||
<a id="__codelineno-4-5" name="__codelineno-4-5" href="#__codelineno-4-5"></a><span class="w"> </span><span class="nx">poindexter</span><span class="w"> </span><span class="s">"github.com/Snider/Poindexter"</span>
|
||
<a id="__codelineno-4-6" name="__codelineno-4-6" href="#__codelineno-4-6"></a><span class="p">)</span>
|
||
<a id="__codelineno-4-7" name="__codelineno-4-7" href="#__codelineno-4-7"></a>
|
||
<a id="__codelineno-4-8" name="__codelineno-4-8" href="#__codelineno-4-8"></a><span class="kd">type</span><span class="w"> </span><span class="nx">Peer</span><span class="w"> </span><span class="kd">struct</span><span class="w"> </span><span class="p">{</span>
|
||
<a id="__codelineno-4-9" name="__codelineno-4-9" href="#__codelineno-4-9"></a><span class="w"> </span><span class="nx">ID</span><span class="w"> </span><span class="kt">string</span>
|
||
<a id="__codelineno-4-10" name="__codelineno-4-10" href="#__codelineno-4-10"></a><span class="w"> </span><span class="nx">PingMS</span><span class="w"> </span><span class="kt">float64</span>
|
||
<a id="__codelineno-4-11" name="__codelineno-4-11" href="#__codelineno-4-11"></a><span class="w"> </span><span class="nx">Hops</span><span class="w"> </span><span class="kt">float64</span>
|
||
<a id="__codelineno-4-12" name="__codelineno-4-12" href="#__codelineno-4-12"></a><span class="p">}</span>
|
||
<a id="__codelineno-4-13" name="__codelineno-4-13" href="#__codelineno-4-13"></a>
|
||
<a id="__codelineno-4-14" name="__codelineno-4-14" href="#__codelineno-4-14"></a><span class="kd">var</span><span class="w"> </span><span class="nx">peers</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="p">[]</span><span class="nx">Peer</span><span class="p">{</span>
|
||
<a id="__codelineno-4-15" name="__codelineno-4-15" href="#__codelineno-4-15"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"A"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">22</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">3</span><span class="p">},</span>
|
||
<a id="__codelineno-4-16" name="__codelineno-4-16" href="#__codelineno-4-16"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"B"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">34</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">},</span>
|
||
<a id="__codelineno-4-17" name="__codelineno-4-17" href="#__codelineno-4-17"></a><span class="w"> </span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"C"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">15</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">4</span><span class="p">},</span>
|
||
<a id="__codelineno-4-18" name="__codelineno-4-18" href="#__codelineno-4-18"></a><span class="p">}</span>
|
||
<a id="__codelineno-4-19" name="__codelineno-4-19" href="#__codelineno-4-19"></a>
|
||
<a id="__codelineno-4-20" name="__codelineno-4-20" href="#__codelineno-4-20"></a><span class="kd">func</span><span class="w"> </span><span class="nx">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
|
||
<a id="__codelineno-4-21" name="__codelineno-4-21" href="#__codelineno-4-21"></a><span class="w"> </span><span class="c1">// Initial 2‑D build (ping + hops)</span>
|
||
<a id="__codelineno-4-22" name="__codelineno-4-22" href="#__codelineno-4-22"></a><span class="w"> </span><span class="nx">weights2</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="kt">float64</span><span class="p">{</span><span class="mf">1.0</span><span class="p">,</span><span class="w"> </span><span class="mf">1.0</span><span class="p">}</span>
|
||
<a id="__codelineno-4-23" name="__codelineno-4-23" href="#__codelineno-4-23"></a><span class="w"> </span><span class="nx">invert2</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="kt">bool</span><span class="p">{</span><span class="kc">false</span><span class="p">,</span><span class="w"> </span><span class="kc">false</span><span class="p">}</span>
|
||
<a id="__codelineno-4-24" name="__codelineno-4-24" href="#__codelineno-4-24"></a>
|
||
<a id="__codelineno-4-25" name="__codelineno-4-25" href="#__codelineno-4-25"></a><span class="w"> </span><span class="c1">// Compute normalization stats once over your baseline set</span>
|
||
<a id="__codelineno-4-26" name="__codelineno-4-26" href="#__codelineno-4-26"></a><span class="w"> </span><span class="nx">stats</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">ComputeNormStats2D</span><span class="p">(</span>
|
||
<a id="__codelineno-4-27" name="__codelineno-4-27" href="#__codelineno-4-27"></a><span class="w"> </span><span class="nx">peers</span><span class="p">,</span>
|
||
<a id="__codelineno-4-28" name="__codelineno-4-28" href="#__codelineno-4-28"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">PingMS</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-4-29" name="__codelineno-4-29" href="#__codelineno-4-29"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">Hops</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-4-30" name="__codelineno-4-30" href="#__codelineno-4-30"></a><span class="w"> </span><span class="p">)</span>
|
||
<a id="__codelineno-4-31" name="__codelineno-4-31" href="#__codelineno-4-31"></a>
|
||
<a id="__codelineno-4-32" name="__codelineno-4-32" href="#__codelineno-4-32"></a><span class="w"> </span><span class="c1">// Build using the precomputed stats so future inserts share the same scale</span>
|
||
<a id="__codelineno-4-33" name="__codelineno-4-33" href="#__codelineno-4-33"></a><span class="w"> </span><span class="nx">pts</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">Build2DWithStats</span><span class="p">(</span>
|
||
<a id="__codelineno-4-34" name="__codelineno-4-34" href="#__codelineno-4-34"></a><span class="w"> </span><span class="nx">peers</span><span class="p">,</span>
|
||
<a id="__codelineno-4-35" name="__codelineno-4-35" href="#__codelineno-4-35"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">string</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">ID</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-4-36" name="__codelineno-4-36" href="#__codelineno-4-36"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">PingMS</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-4-37" name="__codelineno-4-37" href="#__codelineno-4-37"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">Hops</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-4-38" name="__codelineno-4-38" href="#__codelineno-4-38"></a><span class="w"> </span><span class="nx">weights2</span><span class="p">,</span><span class="w"> </span><span class="nx">invert2</span><span class="p">,</span><span class="w"> </span><span class="nx">stats</span><span class="p">,</span>
|
||
<a id="__codelineno-4-39" name="__codelineno-4-39" href="#__codelineno-4-39"></a><span class="w"> </span><span class="p">)</span>
|
||
<a id="__codelineno-4-40" name="__codelineno-4-40" href="#__codelineno-4-40"></a><span class="w"> </span><span class="nx">tree</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">NewKDTree</span><span class="p">(</span><span class="nx">pts</span><span class="p">)</span>
|
||
<a id="__codelineno-4-41" name="__codelineno-4-41" href="#__codelineno-4-41"></a>
|
||
<a id="__codelineno-4-42" name="__codelineno-4-42" href="#__codelineno-4-42"></a><span class="w"> </span><span class="c1">// Insert a new peer: reuse the same normalization stats to keep scale consistent</span>
|
||
<a id="__codelineno-4-43" name="__codelineno-4-43" href="#__codelineno-4-43"></a><span class="w"> </span><span class="nx">newPeer</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">Peer</span><span class="p">{</span><span class="nx">ID</span><span class="p">:</span><span class="w"> </span><span class="s">"Z"</span><span class="p">,</span><span class="w"> </span><span class="nx">PingMS</span><span class="p">:</span><span class="w"> </span><span class="mi">12</span><span class="p">,</span><span class="w"> </span><span class="nx">Hops</span><span class="p">:</span><span class="w"> </span><span class="mi">2</span><span class="p">}</span>
|
||
<a id="__codelineno-4-44" name="__codelineno-4-44" href="#__codelineno-4-44"></a><span class="w"> </span><span class="nx">addPts</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">poindexter</span><span class="p">.</span><span class="nx">Build2DWithStats</span><span class="p">(</span>
|
||
<a id="__codelineno-4-45" name="__codelineno-4-45" href="#__codelineno-4-45"></a><span class="w"> </span><span class="p">[]</span><span class="nx">Peer</span><span class="p">{</span><span class="nx">newPeer</span><span class="p">},</span>
|
||
<a id="__codelineno-4-46" name="__codelineno-4-46" href="#__codelineno-4-46"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">string</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">ID</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-4-47" name="__codelineno-4-47" href="#__codelineno-4-47"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">PingMS</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-4-48" name="__codelineno-4-48" href="#__codelineno-4-48"></a><span class="w"> </span><span class="kd">func</span><span class="p">(</span><span class="nx">p</span><span class="w"> </span><span class="nx">Peer</span><span class="p">)</span><span class="w"> </span><span class="kt">float64</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">p</span><span class="p">.</span><span class="nx">Hops</span><span class="w"> </span><span class="p">},</span>
|
||
<a id="__codelineno-4-49" name="__codelineno-4-49" href="#__codelineno-4-49"></a><span class="w"> </span><span class="nx">weights2</span><span class="p">,</span><span class="w"> </span><span class="nx">invert2</span><span class="p">,</span><span class="w"> </span><span class="nx">stats</span><span class="p">,</span>
|
||
<a id="__codelineno-4-50" name="__codelineno-4-50" href="#__codelineno-4-50"></a><span class="w"> </span><span class="p">)</span>
|
||
<a id="__codelineno-4-51" name="__codelineno-4-51" href="#__codelineno-4-51"></a><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="nx">tree</span><span class="p">.</span><span class="nx">Insert</span><span class="p">(</span><span class="nx">addPts</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span>
|
||
<a id="__codelineno-4-52" name="__codelineno-4-52" href="#__codelineno-4-52"></a>
|
||
<a id="__codelineno-4-53" name="__codelineno-4-53" href="#__codelineno-4-53"></a><span class="w"> </span><span class="c1">// Verify nearest now prefers Z for low ping target</span>
|
||
<a id="__codelineno-4-54" name="__codelineno-4-54" href="#__codelineno-4-54"></a><span class="w"> </span><span class="nx">best</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="p">,</span><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nx">tree</span><span class="p">.</span><span class="nx">Nearest</span><span class="p">([]</span><span class="kt">float64</span><span class="p">{</span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">})</span>
|
||
<a id="__codelineno-4-55" name="__codelineno-4-55" href="#__codelineno-4-55"></a><span class="w"> </span><span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="s">"Best after insert:"</span><span class="p">,</span><span class="w"> </span><span class="nx">best</span><span class="p">.</span><span class="nx">ID</span><span class="p">)</span>
|
||
<a id="__codelineno-4-56" name="__codelineno-4-56" href="#__codelineno-4-56"></a>
|
||
<a id="__codelineno-4-57" name="__codelineno-4-57" href="#__codelineno-4-57"></a><span class="w"> </span><span class="c1">// Delete by ID when peer goes offline</span>
|
||
<a id="__codelineno-4-58" name="__codelineno-4-58" href="#__codelineno-4-58"></a><span class="w"> </span><span class="nx">_</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="nx">tree</span><span class="p">.</span><span class="nx">DeleteByID</span><span class="p">(</span><span class="s">"Z"</span><span class="p">)</span>
|
||
<a id="__codelineno-4-59" name="__codelineno-4-59" href="#__codelineno-4-59"></a><span class="p">}</span>
|
||
</code></pre></div>
|
||
<h2 id="choosing-a-metric">Choosing a metric</h2>
|
||
<ul>
|
||
<li>Euclidean (L2): smooth trade‑offs across axes; good default for blended preferences</li>
|
||
<li>Manhattan (L1): emphasizes per‑axis absolute differences; useful when each unit of ping/hop matters equally</li>
|
||
<li>Chebyshev (L∞): min‑max style; dominated by the worst axis (e.g., reject any peer with too many hops regardless of ping)</li>
|
||
</ul>
|
||
<h2 id="notes-on-production-use">Notes on production use</h2>
|
||
<ul>
|
||
<li>Keep and reuse normalization parameters (min/max or mean/std) rather than recomputing per query to avoid drift.</li>
|
||
<li>Consider capping outliers (e.g., clamp geo distances > 5000 km).</li>
|
||
<li>For large N (≥ 1e5) and low dims (≤ 8), consider swapping the internal engine to <code>gonum.org/v1/gonum/spatial/kdtree</code> behind the same API for faster queries.</li>
|
||
</ul>
|
||
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