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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 rotr90 = require( '@stdlib/ndarray/base/rotr90' );
var assign = require( '@stdlib/ndarray/base/assign' );
// MAIN //
/**
* Returns a new ndarray where a matrix (or a stack of matrices) is rotated 90 degrees clockwise.
*
* @param {ndarray} x - input array
* @param {integer} k - number of times to rotate by 90 degrees
* @returns {ndarray} output array
*
* @example
* var array = require( '@stdlib/ndarray/array' );
*
* var x = array( [ [ 1, 2 ], [ 3, 4 ] ] );
* // returns <ndarray>[ [ 1, 2 ], [ 3, 4 ] ]
*
* var y = toRotr90( x, 1 );
* // returns <ndarray>[ [ 3, 1 ], [ 4, 2 ] ]
*/
function toRotr90( x, k ) {
var out;
var xr;
// Create a rotated view of the input ndarray:
xr = rotr90( x, k, false );
// Create an output ndarray having the same shape and data type as the rotated view:
out = emptyLike( xr );
// Assign the elements of the rotated view to the output ndarray:
assign( [ xr, out ] );
return out;
}
// EXPORTS //
module.exports = toRotr90;
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