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* @license Apache-2.0
*
* Copyright (c) 2026 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-complex64' );
var Complex64 = require( '@stdlib/complex/float32/ctor' );
// MAIN //
/**
* Computes the dot product `x^H * y` of `x` and `y`.
*
* @param {integer} N - number of indexed elements
* @param {Complex64Array} x - first input array
* @param {integer} strideX - `x` stride length
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {Complex64Array} y - second input array
* @param {integer} strideY - `y` stride length
* @param {NonNegativeInteger} offsetY - starting index for `y`
* @returns {Complex64} dot product
*
* @example
* var Complex64Array = require( '@stdlib/array/complex64' );
* var Complex64 = require( '@stdlib/complex/float32/ctor' );
*
* var x = new Complex64Array( [ 7.0, -8.0, -1.0, -9.0 ] );
* var y = new Complex64Array( [ 6.0, -6.0, -9.0, 5.0 ] );
*
* var z = cdotc( x.length, x, 1, 0, y, 1, 0 );
* // returns <Complex64>[ 54.0, -80.0 ]
*/
function cdotc( N, x, strideX, offsetX, y, strideY, offsetY ) {
var viewX;
var viewY;
var tr;
var ti;
var ix;
var iy;
var sx;
var sy;
var i;
if ( N <= 0 ) {
return new Complex64( 0.0, 0.0 );
}
viewX = reinterpret( x, 0 );
viewY = reinterpret( y, 0 );
ix = offsetX * 2;
iy = offsetY * 2;
sx = strideX * 2;
sy = strideY * 2;
tr = 0.0;
ti = 0.0;
for ( i = 0; i < N; i++ ) {
tr += ( viewX[ ix ] * viewY[ iy ] ) +
( viewX[ ix + 1 ] * viewY[ iy + 1 ] );
ti += ( viewX[ ix ] * viewY[ iy + 1 ] ) -
( viewX[ ix + 1 ] * viewY[ iy ] );
ix += sx;
iy += sy;
}
return new Complex64( tr, ti );
}
// EXPORTS //
module.exports = cdotc;
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