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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 numelDimension = require( '@stdlib/ndarray/base/numel-dimension' );
var getStride = require( '@stdlib/ndarray/base/stride' );
var getOffset = require( '@stdlib/ndarray/base/offset' );
var getData = require( '@stdlib/ndarray/base/data-buffer' );
var strided = require( '@stdlib/blas/ext/base/gwhere' ).ndarray;
// MAIN //
/**
* Takes elements from one of two one-dimensional ndarrays depending on a condition.
*
* ## Notes
*
* - The function expects the following ndarrays:
*
* - a one-dimensional condition ndarray.
* - first one-dimensional input ndarray.
* - second one-dimensional input ndarray.
* - a one-dimensional output ndarray.
*
* @param {ArrayLikeObject<Object>} arrays - array-like object containing ndarrays
* @returns {ndarray} output ndarray
*
* @example
* var vector = require( '@stdlib/ndarray/vector/ctor' );
*
* var condition = vector( [ 1, 0, 1, 0, 1 ], 'generic' );
* var x = vector( [ 1.0, 2.0, 3.0, 4.0, 5.0 ], 'generic' );
* var y = vector( [ 6.0, 7.0, 8.0, 9.0, 10.0 ], 'generic' );
* var out = vector( [ 0.0, 0.0, 0.0, 0.0, 0.0 ], 'generic' );
*
* var v = gwhere( [ condition, x, y, out ] );
* // returns <ndarray>[ 1.0, 7.0, 3.0, 9.0, 5.0 ]
*/
function gwhere( arrays ) {
var condition;
var out;
var x;
var y;
condition = arrays[ 0 ];
x = arrays[ 1 ];
y = arrays[ 2 ];
out = arrays[ 3 ];
strided( numelDimension( condition, 0 ), getData( condition ), getStride( condition, 0 ), getOffset( condition ), getData( x ), getStride( x, 0 ), getOffset( x ), getData( y ), getStride( y, 0 ), getOffset( y ), getData( out ), getStride( out, 0 ), getOffset( out ) ); // eslint-disable-line max-len
return out;
}
// EXPORTS //
module.exports = gwhere;
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