uniform.js (1107B)
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 * Returns a uniformly distributed pseudorandom number with minimum support `a` and maximum support `b`. 23 * 24 * @private 25 * @param {PRNG} rand - pseudorandom number generator 26 * @param {number} a - minimum support (inclusive) 27 * @param {number} b - maximum support (exclusive) 28 * @returns {number} pseudorandom number 29 */ 30 function uniform( rand, a, b ) { 31 var r = rand(); 32 return ( b*r ) + ( (1.0-r)*a ); // equivalent to (b-a)*r + a 33 } 34 35 36 // EXPORTS // 37 38 module.exports = uniform;