sample1.js (1154B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 /** 22 * Generates a binomially distributed pseudorandom number by computing the sum of Bernoulli random variables. 23 * 24 * @private 25 * @param {PRNG} rand - PRNG for uniformly distributed numbers 26 * @param {PositiveInteger} n - number of trials 27 * @param {Probability} p - success probability 28 * @returns {NonNegativeInteger} pseudorandom number 29 */ 30 function sample( rand, n, p ) { 31 var sum = 0; 32 var i; 33 for ( i = 0; i < n; i++ ) { 34 if ( rand() <= p ) { 35 sum += 1; 36 } 37 } 38 return sum; 39 } 40 41 42 // EXPORTS // 43 44 module.exports = sample;