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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.
*/
/* eslint-disable max-params */
'use strict';
// MODULES //
var isRowMajor = require( '@stdlib/ndarray/base/assert/is-row-major' );
var sfill = require( '@stdlib/blas/ext/base/sfill' ).ndarray;
var scopy = require( '@stdlib/blas/base/scopy' ).ndarray;
// MAIN //
/**
* Computes the Cartesian product for two single-precision floating-point strided arrays 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} M - number of indexed elements in `x`
* @param {NonNegativeInteger} N - number of indexed elements in `y`
* @param {Float32Array} x - first input array
* @param {integer} strideX - stride length for `x`
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {Float32Array} y - second input array
* @param {integer} strideY - stride length for `y`
* @param {NonNegativeInteger} offsetY - starting index for `y`
* @param {Float32Array} 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 {Float32Array} output array
*
* @example
* var Float32Array = require( '@stdlib/array/float32' );
*
* var x = new Float32Array( [ 1.0, 2.0 ] );
* var y = new Float32Array( [ 3.0, 4.0 ] );
* var out = new Float32Array( 8 );
*
* scartesianProduct( x.length, y.length, x, 1, 0, y, 1, 0, out, 2, 1, 0 );
* // out => <Float32Array>[ 1.0, 3.0, 1.0, 4.0, 2.0, 3.0, 2.0, 4.0 ]
*/
function scartesianProduct( M, N, x, strideX, offsetX, y, strideY, offsetY, out, strideOut1, strideOut2, offsetOut ) { // eslint-disable-line max-len
var iy;
var ix;
var io;
var v;
var i;
var j;
if ( M <= 0 || N <= 0 ) {
return out;
}
ix = offsetX;
io = offsetOut;
if ( isRowMajor( [ strideOut1, strideOut2 ] ) ) {
for ( i = 0; i < M; i++ ) {
v = x[ ix ];
iy = offsetY;
for ( j = 0; j < N; j++ ) {
out[ io ] = v;
out[ io + strideOut2 ] = y[ iy ];
iy += strideY;
io += strideOut1;
}
ix += strideX;
}
return out;
}
// Column-major...
for ( i = 0; i < M; i++ ) {
sfill( N, x[ ix ], out, strideOut1, io );
io += N * strideOut1;
ix += strideX;
}
io = offsetOut + strideOut2;
for ( i = 0; i < M; i++ ) {
scopy( N, y, strideY, offsetY, out, strideOut1, io );
io += N * strideOut1;
}
return out;
}
// EXPORTS //
module.exports = scartesianProduct;
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