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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 base = require( '@stdlib/ndarray/base/transpose' );
var ndims = require( '@stdlib/ndarray/ndims' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns a read-only view of an input ndarray in which the last two dimensions are transposed.
*
* ## Notes
*
* - The function operates on a stack of matrices, transposing the last two dimensions of the input ndarray.
* - The input ndarray must have at least two dimensions.
*
* @param {ndarray} x - input array
* @throws {TypeError} first argument must be an ndarray
* @throws {RangeError} input ndarray must have at least two dimensions
* @returns {ndarray} ndarray view
*
* @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 = transpose( x );
* // returns <ndarray>[ [ 1.0, 4.0 ], [ 2.0, 5.0 ], [ 3.0, 6.0 ] ]
*/
function transpose( x ) {
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( format( 'invalid argument. Input ndarray must have at least two dimensions. Number of dimensions: `%u`.', ndims( x ) ) );
}
return base( x, false );
}
// EXPORTS //
module.exports = transpose;
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