103 lines
2.3 KiB
JavaScript
103 lines
2.3 KiB
JavaScript
|
/**
|
||
|
|
* @license Apache-2.0
|
||
|
|
*
|
||
|
|
* Copyright (c) 2020 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 Float32Array = require( '@stdlib/array/float32' );
|
||
|
|
|
||
|
|
|
||
|
|
// MAIN //
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Copies values from one complex single-precision floating-point vector to another complex single-precision floating-point vector.
|
||
|
|
*
|
||
|
|
* @param {PositiveInteger} N - number of values to copy
|
||
|
|
* @param {Complex64Array} x - input array
|
||
|
|
* @param {integer} strideX - `x` stride length
|
||
|
|
* @param {Complex64Array} y - destination array
|
||
|
|
* @param {integer} strideY - `y` stride length
|
||
|
|
* @returns {Complex64Array} `y`
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* var Complex64Array = require( '@stdlib/array/complex64' );
|
||
|
|
* var real = require( '@stdlib/complex/real' );
|
||
|
|
* var imag = require( '@stdlib/complex/imag' );
|
||
|
|
*
|
||
|
|
* var x = new Complex64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
|
||
|
|
* var y = new Complex64Array( [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );
|
||
|
|
*
|
||
|
|
* ccopy( x.length, x, 1, y, 1 );
|
||
|
|
*
|
||
|
|
* var z = y.get( 0 );
|
||
|
|
* // returns <Complex64>
|
||
|
|
*
|
||
|
|
* var re = real( z );
|
||
|
|
* // returns 1.0
|
||
|
|
*
|
||
|
|
* var im = imag( z );
|
||
|
|
* // returns 2.0
|
||
|
|
*/
|
||
|
|
function ccopy( N, x, strideX, y, strideY ) {
|
||
|
|
var viewX;
|
||
|
|
var viewY;
|
||
|
|
var sx;
|
||
|
|
var sy;
|
||
|
|
var ix;
|
||
|
|
var iy;
|
||
|
|
var i;
|
||
|
|
|
||
|
|
if ( N <= 0 ) {
|
||
|
|
return y;
|
||
|
|
}
|
||
|
|
viewX = new Float32Array( x.buffer, x.byteOffset, x.length*2 );
|
||
|
|
viewY = new Float32Array( y.buffer, y.byteOffset, y.length*2 );
|
||
|
|
if ( strideX === 1 && strideY === 1 ) {
|
||
|
|
for ( i = 0; i < N*2; i += 2 ) {
|
||
|
|
viewY[ i ] = viewX[ i ];
|
||
|
|
viewY[ i+1 ] = viewX[ i+1 ];
|
||
|
|
}
|
||
|
|
return y;
|
||
|
|
}
|
||
|
|
if ( strideX < 0 ) {
|
||
|
|
ix = 2 * (1-N) * strideX;
|
||
|
|
} else {
|
||
|
|
ix = 0;
|
||
|
|
}
|
||
|
|
if ( strideY < 0 ) {
|
||
|
|
iy = 2 * (1-N) * strideY;
|
||
|
|
} else {
|
||
|
|
iy = 0;
|
||
|
|
}
|
||
|
|
sx = strideX * 2;
|
||
|
|
sy = strideY * 2;
|
||
|
|
for ( i = 0; i < N; i++ ) {
|
||
|
|
viewY[ iy ] = viewX[ ix ];
|
||
|
|
viewY[ iy+1 ] = viewX[ ix+1 ];
|
||
|
|
ix += sx;
|
||
|
|
iy += sy;
|
||
|
|
}
|
||
|
|
return y;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// EXPORTS //
|
||
|
|
|
||
|
|
module.exports = ccopy;
|