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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 isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
var ndims = require( '@stdlib/ndarray/ndims' );
var ndarraylike2ndarray = require( '@stdlib/ndarray/base/ndarraylike2ndarray' );
var transpose = require( '@stdlib/ndarray/base/transpose' );
var emptyLike = require( '@stdlib/ndarray/empty-like' );
var assign = require( '@stdlib/ndarray/base/assign' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns a new ndarray containing the elements of an input ndarray but whose last two dimensions are transposed.
*
* @param {ndarray} x - input array
* @throws {TypeError} first argument must be an ndarray
* @throws {RangeError} must provide an ndarray having two or more dimensions
* @returns {ndarray} output ndarray
*
* @example
* var array = require( '@stdlib/ndarray/array' );
*
* var x = array( [ [ 1, 2, 3 ], [ 4, 5, 6 ] ] );
* // returns <ndarray>[ [ 1, 2, 3 ], [ 4, 5, 6 ] ]
*
* var y = toTransposed( x );
* // returns <ndarray>[ [ 1, 4 ], [ 2, 5 ], [ 3, 6 ] ]
*/
function toTransposed( x ) {
var out;
var bv;
if ( !isndarrayLike( x ) ) {
throw new TypeError( format( 'invalid argument. First argument must be an ndarray. Value: `%s`.', x ) );
}
if ( ndims( x ) < 2 ) {
throw new RangeError( 'invalid argument. Must provide an ndarray having two or more dimensions.' );
}
bv = ndarraylike2ndarray( x );
bv = transpose( bv, false );
out = emptyLike( bv );
assign( [ bv, out ] );
return out;
}
// EXPORTS //
module.exports = toTransposed;
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