45 lines
1.1 KiB
JavaScript
45 lines
1.1 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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/**
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* Generates a binomially distributed pseudorandom number by computing the sum of Bernoulli random variables.
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*
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* @private
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* @param {PRNG} rand - PRNG for uniformly distributed numbers
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* @param {PositiveInteger} n - number of trials
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* @param {Probability} p - success probability
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* @returns {NonNegativeInteger} pseudorandom number
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*/
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function sample( rand, n, p ) {
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var sum = 0;
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var i;
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for ( i = 0; i < n; i++ ) {
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if ( rand() <= p ) {
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sum += 1;
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}
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}
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return sum;
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}
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// EXPORTS //
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module.exports = sample;
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