41 lines
886 B
Go
41 lines
886 B
Go
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package poindexter
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// Factor is a value–weight pair for composite scoring.
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type Factor struct {
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Value float64
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Weight float64
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}
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// WeightedScore computes the weighted sum of factors.
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// Each factor contributes Value * Weight to the total.
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// Returns 0 for empty slices.
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func WeightedScore(factors []Factor) float64 {
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var total float64
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for _, f := range factors {
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total += f.Value * f.Weight
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}
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return total
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}
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// Ratio returns part/whole safely. Returns 0 if whole is 0.
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func Ratio(part, whole float64) float64 {
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if whole == 0 {
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return 0
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}
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return part / whole
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}
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// Delta returns the difference new_ - old.
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func Delta(old, new_ float64) float64 {
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return new_ - old
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}
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// DeltaPercent returns the percentage change from old to new_.
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// Returns 0 if old is 0.
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func DeltaPercent(old, new_ float64) float64 {
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if old == 0 {
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return 0
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}
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return (new_ - old) / old * 100
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}
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