Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var isnan = require( '@stdlib/math/base/assert/is-nan' );
// VARIABLES //
var NUM_WARMUPS = 8;
// MAIN //
/**
* Initializes a shuffle table.
*
* @private
* @param {PRNG} rand - pseudorandom number generator
* @param {Int32Array} table - table
* @param {PositiveInteger} N - table size
* @throws {Error} PRNG returned `NaN`
* @returns {NumberArray} shuffle table
*/
function createTable( rand, table, N ) {
var v;
var i;
// "warm-up" the PRNG...
for ( i = 0; i < NUM_WARMUPS; i++ ) {
v = rand();
// Prevent the above loop from being discarded by the compiler...
if ( isnan( v ) ) {
throw new Error( 'unexpected error. PRNG returned NaN.' );
}
}
// Initialize the shuffle table...
for ( i = N-1; i >= 0; i-- ) {
table[ i ] = rand();
}
return table;
}
// EXPORTS //
module.exports = createTable;
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