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PSMath.ts
39 lines (31 loc) · 1001 Bytes
/
PSMath.ts
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/**
* Some useful Maths methods.
*/
export class PSMath {
public static log(base: number, x: number): number {
return Math.log(x) / Math.log(base);
}
public static log10(x: number): number {
return PSMath.log(10, x);
}
public static meanSimple(values: number[]): number {
let sum: number = 0;
for (let i: number = 0; i < values.length; i++) {
sum += values[i];
}
return sum / values.length;
}
public static meanWeighted(values: number[], weights: number[]): number {
if (values.length !== weights.length || values.length === 0) {
return 0;
}
let sumWeigtedValues: number = 0;
let sumWeights: number = 0;
for (let i: number = 0; i < values.length; i++) {
const weight: number = weights[i];
sumWeigtedValues += values[i] * weight;
sumWeights += weight;
}
return sumWeigtedValues / sumWeights;
}
}