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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 arraylike2object = require( '@stdlib/array/base/arraylike2object' );
var accessors = require( './accessors.js' );
// MAIN //
/**
* Computes the cross product of two input strided arrays and assigns the results to an output strided array.
*
* @param {NumericArray} x - first input array
* @param {integer} strideX - stride length for `x`
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {NumericArray} y - second input array
* @param {integer} strideY - stride length for `y`
* @param {NonNegativeInteger} offsetY - starting index for `y`
* @param {NumericArray} z - output array
* @param {integer} strideZ - stride length for `z`
* @param {NonNegativeInteger} offsetZ - starting index for `z`
* @returns {NumericArray} output array
*
* @example
* var x = [ 1.0, 2.0, 3.0 ];
* var y = [ 4.0, 5.0, 6.0 ];
* var z = [ 0.0, 0.0, 0.0 ];
*
* gcross( x, 1, 0, y, 1, 0, z, 1, 0 );
* // z => [ -3.0, 6.0, -3.0 ]
*/
function gcross( x, strideX, offsetX, y, strideY, offsetY, z, strideZ, offsetZ ) {
var ox;
var oy;
var oz;
var x0;
var x1;
var x2;
var y0;
var y1;
var y2;
ox = arraylike2object( x );
oy = arraylike2object( y );
oz = arraylike2object( z );
if ( ox.accessorProtocol || oy.accessorProtocol || oz.accessorProtocol ) {
accessors( ox, strideX, offsetX, oy, strideY, offsetY, oz, strideZ, offsetZ );
return z;
}
// Cache array elements...
x0 = x[ offsetX ];
x1 = x[ offsetX+strideX ];
x2 = x[ offsetX+(2*strideX) ];
y0 = y[ offsetY ];
y1 = y[ offsetY+strideY ];
y2 = y[ offsetY+(2*strideY) ];
// Resolve cross product...
z[ offsetZ ] = (x1*y2) - (x2*y1);
z[ offsetZ+strideZ ] = (x2*y0) - (x0*y2);
z[ offsetZ+(2*strideZ) ] = (x0*y1) - (x1*y0);
return z;
}
// EXPORTS //
module.exports = gcross;
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