88 lines
2.3 KiB
JavaScript
88 lines
2.3 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2020 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 Float32Array = require( '@stdlib/array/float32' );
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var addon = require( './../src/addon.node' );
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// MAIN //
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/**
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* Interchanges two complex single-precision floating-point vectors.
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*
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* @param {PositiveInteger} N - number of values to swap
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* @param {Complex64Array} x - first input array
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* @param {integer} strideX - `x` stride length
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* @param {NonNegativeInteger} offsetX - starting `x` index
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* @param {Complex64Array} y - second input array
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* @param {integer} strideY - `y` stride length
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* @param {NonNegativeInteger} offsetY - starting `y` index
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* @returns {Complex64Array} `y`
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*
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* @example
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* var Complex64Array = require( '@stdlib/array/complex64' );
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* var real = require( '@stdlib/complex/real' );
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* var imag = require( '@stdlib/complex/imag' );
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*
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* var x = new Complex64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
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* var y = new Complex64Array( [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );
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*
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* cswap( x.length, x, 1, 0, y, 1, 0 );
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*
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* var z = y.get( 0 );
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* // returns <Complex64>
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*
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* var re = real( z );
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* // returns 1.0
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*
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* var im = imag( z );
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* // returns 2.0
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*
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* z = x.get( 0 );
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* // returns <Complex64>
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*
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* re = real( z );
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* // returns 7.0
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*
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* im = imag( z );
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* // returns 8.0
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*/
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function cswap( N, x, strideX, offsetX, y, strideY, offsetY ) {
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var viewX;
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var viewY;
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if ( strideX < 0 ) {
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offsetX += (N-1) * strideX;
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}
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if ( strideY < 0 ) {
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offsetY += (N-1) * strideY;
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}
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viewX = new Float32Array( x.buffer, x.byteOffset+(x.BYTES_PER_ELEMENT*offsetX), 2*(x.length-offsetX) ); // eslint-disable-line max-len
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viewY = new Float32Array( y.buffer, y.byteOffset+(y.BYTES_PER_ELEMENT*offsetY), 2*(y.length-offsetY) ); // eslint-disable-line max-len
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addon( N, viewX, strideX, viewY, strideY );
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return y;
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}
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// EXPORTS //
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module.exports = cswap;
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