d3-random/src/logistic.js

Generate random numbers from various distributions.

import defaultSource from "./defaultSource.js";

export default (function sourceRandomLogistic(source) {
  function randomLogistic(a, b) {
    a = a == null ? 0 : +a;
    b = b == null ? 1 : +b;
    return function() {
      var u = source();
      return a + b * Math.log(u / (1 - u));
    };
  }

  randomLogistic.source = sourceRandomLogistic;

  return randomLogistic;
})(defaultSource);