Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 25x 8x 8x 17x 17x 17x 17x 17x 17x 17x 17x 25x 63x 63x 63x 63x 17x 25x 3x 3x 3x 3x 3x | /**
* @license Apache-2.0
*
* Copyright (c) 2024 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 reinterpret = require( '@stdlib/strided/base/reinterpret-complex128' );
var muladd = require( '@stdlib/complex/float64/base/mul-add' ).assign;
var real = require( '@stdlib/complex/float64/real' );
var imag = require( '@stdlib/complex/float64/imag' );
var dcabs1 = require( '@stdlib/blas/base/dcabs1' );
// MAIN //
/**
* Scales a double-precision complex floating-point vector by a double-precision complex floating-point constant and adds the result to a double-precision complex floating-point vector.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {Complex128} alpha - scalar constant
* @param {Complex128Array} x - first input array
* @param {integer} strideX - `x` stride length
* @param {integer} offsetX - starting index for `x`
* @param {Complex128Array} y - second input array
* @param {integer} strideY - `y` stride length
* @param {integer} offsetY - starting index for `y`
* @returns {Complex128Array} second input array
*
* @example
* var Complex128Array = require( '@stdlib/array/complex128' );
* var Complex128 = require( '@stdlib/complex/float64/ctor' );
*
* var x = new Complex128Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
* var y = new Complex128Array( [ 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 ] );
* var alpha = new Complex128( 2.0, 2.0 );
*
* zaxpy( 3, alpha, x, 1, 0, y, 1, 0 );
* // y => <Complex128Array>[ -1.0, 7.0, -1.0, 15.0, -1.0, 23.0 ]
*/
function zaxpy( N, alpha, x, strideX, offsetX, y, strideY, offsetY ) {
var viewX;
var viewY;
var sx;
var sy;
var ix;
var iy;
var re;
var im;
var i;
if ( N <= 0 || dcabs1( alpha ) === 0.0 ) {
return y;
}
re = real( alpha );
im = imag( alpha );
viewX = reinterpret( x, 0 );
viewY = reinterpret( y, 0 );
sx = strideX * 2;
sy = strideY * 2;
ix = offsetX * 2;
iy = offsetY * 2;
for ( i = 0; i < N; i++ ) {
muladd( re, im, viewX[ ix ], viewX[ ix+1 ], viewY[ iy ], viewY[ iy+1 ], viewY, 1, iy ); // eslint-disable-line max-len
ix += sx;
iy += sy;
}
return y;
}
// EXPORTS //
module.exports = zaxpy;
|