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* @license Apache-2.0
*
* Copyright (c) 2025 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 Complex128 = require( '@stdlib/complex/float64/ctor' );
var muladd = require( '@stdlib/complex/float64/base/mul-add' );
// MAIN //
/**
* Calculates the dot product of two double-precision complex floating-point vectors.
*
* @param {integer} N - number of indexed elements
* @param {Complex128Array} zx - first input array
* @param {integer} strideX - `zx` stride length
* @param {NonNegativeInteger} offsetX - starting index for `zx`
* @param {Complex128Array} zy - second input array
* @param {integer} strideY - `zy` stride length
* @param {NonNegativeInteger} offsetY - starting index for `zy`
* @returns {Complex128} dot product
*
* @example
* var Complex128Array = require( '@stdlib/array/complex128' );
* var real = require( '@stdlib/complex/float64/real' );
* var imag = require( '@stdlib/complex/float64/imag' );
*
* var zx = new Complex128Array( [ 4.0, 2.0, -3.0, 5.0, -1.0, 7.0 ] );
* var zy = new Complex128Array( [ 2.0, 6.0, -1.0, -4.0, 8.0, 9.0 ] );
*
* var z = zdotu( 3, zx, 1, 0, zy, 1, 0 );
* // returns <Complex128>
*
* var re = real( z );
* // returns -52.0
*
* var im = imag( z );
* // returns 82.0
*/
function zdotu( N, zx, strideX, offsetX, zy, strideY, offsetY ) {
var dot;
var ix;
var iy;
var i;
dot = new Complex128( 0.0, 0.0 );
if ( N <= 0 ) {
return dot;
}
ix = offsetX;
iy = offsetY;
for ( i = 0; i < N; i++ ) {
dot = muladd( zx.get( ix ), zy.get( iy ), dot );
ix += strideX;
iy += strideY;
}
return dot;
}
// EXPORTS //
module.exports = zdotu;
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