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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 isRowMajor = require( '@stdlib/ndarray/base/assert/is-row-major' );
var zfill = require( '@stdlib/blas/ext/base/zfill' ).ndarray;
var zcopy = require( '@stdlib/blas/base/zcopy' ).ndarray;
var reinterpret = require( '@stdlib/strided/base/reinterpret-complex128' );
// MAIN //
/**
* Computes the Cartesian square for a double-precision complex floating-point strided array using alternative indexing semantics.
*
* ## Notes
*
* - Pairs are stored as rows in the output matrix, where the first column contains the first element of each pair and the second column contains the second element.
*
* @param {NonNegativeInteger} N - number of indexed elements
* @param {Complex128Array} x - input array
* @param {integer} strideX - stride length for `x`
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {Complex128Array} out - output array
* @param {integer} strideOut1 - stride length for the first dimension of `out`
* @param {integer} strideOut2 - stride length for the second dimension of `out`
* @param {NonNegativeInteger} offsetOut - starting index for `out`
* @returns {Complex128Array} output array
*
* @example
* var Complex128Array = require( '@stdlib/array/complex128' );
*
* var x = new Complex128Array( [ 1.0, 2.0, 3.0, 4.0 ] );
* var out = new Complex128Array( 8 );
*
* zcartesianSquare( x.length, x, 1, 0, out, 2, 1, 0 );
* // out => <Complex128Array>[ 1.0, 2.0, 1.0, 2.0, 1.0, 2.0, 3.0, 4.0, 3.0, 4.0, 1.0, 2.0, 3.0, 4.0, 3.0, 4.0 ]
*/
function zcartesianSquare( N, x, strideX, offsetX, out, strideOut1, strideOut2, offsetOut ) { // eslint-disable-line max-len
var viewX;
var viewO;
var so1;
var so2;
var sx;
var ix;
var jx;
var io;
var i;
var j;
if ( N <= 0 ) {
return out;
}
if ( isRowMajor( [ strideOut1, strideOut2 ] ) ) {
// Reinterpret the complex arrays as real-valued arrays:
viewX = reinterpret( x, 0 );
viewO = reinterpret( out, 0 );
// Adjust strides and offsets according to the real-valued arrays:
sx = strideX * 2;
so1 = strideOut1 * 2;
so2 = strideOut2 * 2;
ix = offsetX * 2;
io = offsetOut * 2;
for ( i = 0; i < N; i++ ) {
jx = offsetX * 2;
for ( j = 0; j < N; j++ ) {
viewO[ io ] = viewX[ ix ];
viewO[ io+1 ] = viewX[ ix+1 ];
viewO[ io+so2 ] = viewX[ jx ];
viewO[ io+so2+1 ] = viewX[ jx+1 ];
jx += sx;
io += so1;
}
ix += sx;
}
return out;
}
// Column-major:
ix = offsetX;
io = offsetOut;
for ( i = 0; i < N; i++ ) {
zfill( N, x.get( ix ), out, strideOut1, io );
ix += strideX;
io += N * strideOut1;
}
io = offsetOut + strideOut2;
for ( i = 0; i < N; i++ ) {
zcopy( N, x, strideX, offsetX, out, strideOut1, io );
io += N * strideOut1;
}
return out;
}
// EXPORTS //
module.exports = zcartesianSquare;
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