d3-random/src/exponential.js

Generate random numbers from various distributions.

import defaultSource from "./defaultSource.js";

export default (function sourceRandomExponential(source) {
  function randomExponential(lambda) {
    return function() {
      return -Math.log1p(-source()) / lambda;
    };
  }

  randomExponential.source = sourceRandomExponential;

  return randomExponential;
})(defaultSource);