62 lines
1.3 KiB
JavaScript
62 lines
1.3 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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// MODULES //
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var isComplexLike = require( '@stdlib/assert/is-complex-like' );
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var real = require( '@stdlib/complex/real' );
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var imag = require( '@stdlib/complex/imag' );
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// MAIN //
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/**
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* Returns a strided array of real and imaginary components.
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*
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* @private
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* @param {Float64Array} buf - output array
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* @param {Array} arr - array containing complex numbers
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* @returns {(Float64Array|null)} output array or null
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*/
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function fromArray( buf, arr ) {
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var len;
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var v;
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var i;
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var j;
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len = arr.length;
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j = 0;
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for ( i = 0; i < len; i++ ) {
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v = arr[ i ];
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if ( !isComplexLike( v ) ) {
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return null;
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}
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buf[ j ] = real( v );
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buf[ j+1 ] = imag( v );
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j += 2; // stride
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}
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return buf;
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}
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// EXPORTS //
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module.exports = fromArray;
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