time-to-botec

Benchmark sampling in different programming languages
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ndarray.native.js (2404B)

      1 /**
      2 * @license Apache-2.0
      3 *
      4 * Copyright (c) 2020 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 // MODULES //
     22 
     23 var Float32Array = require( '@stdlib/array/float32' );
     24 var addon = require( './../src/addon.node' );
     25 
     26 
     27 // MAIN //
     28 
     29 /**
     30 * Interchanges two complex single-precision floating-point vectors.
     31 *
     32 * @param {PositiveInteger} N - number of values to swap
     33 * @param {Complex64Array} x - first input array
     34 * @param {integer} strideX - `x` stride length
     35 * @param {NonNegativeInteger} offsetX - starting `x` index
     36 * @param {Complex64Array} y - second input array
     37 * @param {integer} strideY - `y` stride length
     38 * @param {NonNegativeInteger} offsetY - starting `y` index
     39 * @returns {Complex64Array} `y`
     40 *
     41 * @example
     42 * var Complex64Array = require( '@stdlib/array/complex64' );
     43 * var real = require( '@stdlib/complex/real' );
     44 * var imag = require( '@stdlib/complex/imag' );
     45 *
     46 * var x = new Complex64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
     47 * var y = new Complex64Array( [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );
     48 *
     49 * cswap( x.length, x, 1, 0, y, 1, 0 );
     50 *
     51 * var z = y.get( 0 );
     52 * // returns <Complex64>
     53 *
     54 * var re = real( z );
     55 * // returns 1.0
     56 *
     57 * var im = imag( z );
     58 * // returns 2.0
     59 *
     60 * z = x.get( 0 );
     61 * // returns <Complex64>
     62 *
     63 * re = real( z );
     64 * // returns 7.0
     65 *
     66 * im = imag( z );
     67 * // returns 8.0
     68 */
     69 function cswap( N, x, strideX, offsetX, y, strideY, offsetY ) {
     70 	var viewX;
     71 	var viewY;
     72 	if ( strideX < 0 ) {
     73 		offsetX += (N-1) * strideX;
     74 	}
     75 	if ( strideY < 0 ) {
     76 		offsetY += (N-1) * strideY;
     77 	}
     78 	viewX = new Float32Array( x.buffer, x.byteOffset+(x.BYTES_PER_ELEMENT*offsetX), 2*(x.length-offsetX) ); // eslint-disable-line max-len
     79 	viewY = new Float32Array( y.buffer, y.byteOffset+(y.BYTES_PER_ELEMENT*offsetY), 2*(y.length-offsetY) ); // eslint-disable-line max-len
     80 	addon( N, viewX, strideX, viewY, strideY );
     81 	return y;
     82 }
     83 
     84 
     85 // EXPORTS //
     86 
     87 module.exports = cswap;