als-statistics/tests/golden/_rng.js

Modular JS statistics toolkit for Node.js and the browser: descriptive stats, correlations (Pearson/Spearman/Kendall), t-tests & ANOVA (Student/Welch), reliability (Cronbach’s alpha), regression (linear/logistic), clustering (DBSCAN/HDBSCAN), and table/co

import seedrandom from 'seedrandom';

export function makeRng(seed) {
  const rng = seedrandom(seed);
  function boxMuller() {
    let u = 0, v = 0;
    while (u === 0) u = rng();
    while (v === 0) v = rng();
    return Math.sqrt(-2 * Math.log(u)) * Math.cos(2 * Math.PI * v);
  }
  return {
    rand: () => rng(),
    normal: (mu=0, sigma=1, n=20) =>
      Array.from({length:n}, () => mu + sigma * boxMuller()),
    uniform: (a=0, b=1, n=20) =>
      Array.from({length:n}, () => a + (b-a)*rng()),
  };
}