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 | 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 3x 3x 3x 3x 3x 3x 3x 3x 23x 23x 23x 23x 23x 23x 4x 4x 23x 2x 2x 17x 17x 23x 63x 63x 63x 63x 17x 23x 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 dcabs1 = require( '@stdlib/blas/base/dcabs1' );
var cmul = require( '@stdlib/complex/float64/base/mul' );
var cadd = require( '@stdlib/complex/float64/base/add' );
// 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} za - scalar constant
* @param {Complex128Array} zx - first input array
* @param {integer} strideX - `zx` stride length
* @param {integer} offsetX - starting index for `zx`
* @param {Complex128Array} zy - second input array
* @param {integer} strideY - `zy` stride length
* @param {integer} offsetY - starting index for `zy`
* @returns {Complex128Array} second input array
*
* @example
* var Complex128Array = require( '@stdlib/array/complex128' );
* var Complex128 = require( '@stdlib/complex/float64/ctor' );
* var real = require( '@stdlib/complex/float64/real' );
* var imag = require( '@stdlib/complex/float64/imag' );
*
* var zx = new Complex128Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
* var zy = new Complex128Array( [ 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 ] );
* var za = new Complex128( 2.0, 2.0 );
*
* zaxpy( 3, za, zx, 1, 0, zy, 1, 0 );
*
* var z = zy.get( 0 );
* // returns <Complex128>
*
* var re = real( z );
* // returns -1.0
*
* var im = imag( z );
* // returns 7.0
*/
function zaxpy( N, za, zx, strideX, offsetX, zy, strideY, offsetY ) {
var ix;
var iy;
var i;
if ( N <= 0 ) {
return zy;
}
if ( dcabs1( za ) === 0.0 ) {
return zy;
}
ix = offsetX;
iy = offsetY;
for ( i = 0; i < N; i++ ) {
zy.set( cadd( cmul( za, zx.get( ix ) ), zy.get( iy ) ), iy );
ix += strideX;
iy += strideY;
}
return zy;
}
// EXPORTS //
module.exports = zaxpy;
|