forked from Snider/Poindexter
fa998619dc
Centralizes common math operations used across core/go-ai, core/go, and core/mining into Poindexter as the math pillar (alongside Borg=data, Enchantrix=encryption). New modules: - stats: Sum, Mean, Variance, StdDev, MinMax, IsUnderrepresented - scale: Lerp, InverseLerp, Remap, RoundToN, Clamp, MinMaxScale - epsilon: ApproxEqual, ApproxZero - score: WeightedScore, Ratio, Delta, DeltaPercent - signal: RampUp, SineWave, Oscillate, Noise (seeded RNG) 235 LOC implementation, 509 LOC tests, zero external deps, WASM-safe. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
61 lines
1.3 KiB
Go
61 lines
1.3 KiB
Go
package poindexter
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import "math"
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// Lerp performs linear interpolation between a and b.
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// t=0 returns a, t=1 returns b, t=0.5 returns the midpoint.
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func Lerp(t, a, b float64) float64 {
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return a + t*(b-a)
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}
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// InverseLerp returns where v falls between a and b as a fraction [0,1].
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// Returns 0 if a == b.
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func InverseLerp(v, a, b float64) float64 {
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if a == b {
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return 0
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}
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return (v - a) / (b - a)
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}
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// Remap maps v from the range [inMin, inMax] to [outMin, outMax].
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// Equivalent to Lerp(InverseLerp(v, inMin, inMax), outMin, outMax).
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func Remap(v, inMin, inMax, outMin, outMax float64) float64 {
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return Lerp(InverseLerp(v, inMin, inMax), outMin, outMax)
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}
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// RoundToN rounds f to n decimal places.
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func RoundToN(f float64, decimals int) float64 {
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mul := math.Pow(10, float64(decimals))
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return math.Round(f*mul) / mul
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}
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// Clamp restricts v to the range [min, max].
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func Clamp(v, min, max float64) float64 {
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if v < min {
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return min
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}
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if v > max {
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return max
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}
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return v
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}
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// ClampInt restricts v to the range [min, max].
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func ClampInt(v, min, max int) int {
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if v < min {
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return min
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}
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if v > max {
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return max
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}
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return v
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}
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// MinMaxScale normalizes v into [0,1] given its range [min, max].
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// Returns 0 if min == max.
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func MinMaxScale(v, min, max float64) float64 {
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if min == max {
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return 0
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}
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return (v - min) / (max - min)
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}
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