d3-random/src/pareto.js

Generate random numbers from various distributions.

import defaultSource from "./defaultSource.js";

export default (function sourceRandomPareto(source) {
  function randomPareto(alpha) {
    if ((alpha = +alpha) < 0) throw new RangeError("invalid alpha");
    alpha = 1 / -alpha;
    return function() {
      return Math.pow(1 - source(), alpha);
    };
  }

  randomPareto.source = sourceRandomPareto;

  return randomPareto;
})(defaultSource);