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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 emptyLike = require( '@stdlib/ndarray/base/empty-like' );
var unflatten = require( '@stdlib/ndarray/base/unflatten' );
var assign = require( '@stdlib/ndarray/base/assign' );
// MAIN //
/**
* Returns a new ndarray in which a specified dimension of an input ndarray is expanded over multiple dimensions.
*
* @param {ndarray} x - input array
* @param {integer} dim - dimension index
* @param {NonNegativeIntegerArray} sizes - new shape of the unflattened dimension
* @throws {RangeError} must provide a valid dimension index
* @throws {RangeError} product of the sizes must be equal to the size of the dimension to be unflattened
* @returns {ndarray} output array
*
* @example
* var array = require( '@stdlib/ndarray/array' );
*
* var x = array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
* // returns <ndarray>[ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ]
*
* var y = toUnflattened( x, 0, [ 2, 3 ] );
* // returns <ndarray>[ [ 1.0, 2.0, 3.0 ], [ 4.0, 5.0, 6.0 ] ]
*/
function toUnflattened( x, dim, sizes ) {
var out;
var xv;
// Create an unflattened view of the input ndarray:
xv = unflatten( x, dim, sizes, false );
// Create an output ndarray with the same data type as the input ndarray having the unflattened shape:
out = emptyLike( xv );
// Assign the elements of the unflattened input ndarray view to the output ndarray:
assign( [ xv, out ] );
return out;
}
// EXPORTS //
module.exports = toUnflattened;
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