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* @license Apache-2.0
*
* Copyright (c) 2022 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 strides2offset = require( '@stdlib/ndarray/base/strides2offset' );
var getDType = require( '@stdlib/ndarray/base/dtype' );
var getShape = require( '@stdlib/ndarray/base/shape' );
var getStrides = require( '@stdlib/ndarray/base/strides' );
var getOrder = require( '@stdlib/ndarray/base/order' );
var getData = require( '@stdlib/ndarray/base/data-buffer' );
// MAIN //
/**
* Transpose a matrix (or a stack of matrices).
*
* @param {ndarray} x - input array
* @throws {Error} must provide an array with two or more dimensions
* @returns {ndarray} ndarray
*
* @example
* var array = require( '@stdlib/ndarray/array' );
*
* var x = array( [ [ 1, 2, 3 ], [ 4, 5, 6 ] ] );
* // returns <ndarray>
*
* var sh = x.shape;
* // returns [ 2, 3 ]
*
* var y = transpose( x );
* // returns <ndarray>
*
* sh = y.shape;
* // returns [ 3, 2 ]
*
* var bool = ( x.data === y.data );
* // returns true
*
* bool = ( x.get( 0, 1 ) === y.get( 1, 0 ) );
* // returns true
*/
function transpose( x ) {
var tmp;
var sh;
var st;
var N;
sh = getShape( x, true );
N = sh.length;
if ( N < 2 ) {
throw new Error( 'invalid argument. Must provide an ndarray having two or more dimensions.' );
}
st = getStrides( x, true );
tmp = sh[ N-2 ];
sh[ N-2 ] = sh[ N-1 ];
sh[ N-1 ] = tmp;
tmp = st[ N-2 ];
st[ N-2 ] = st[ N-1 ];
st[ N-1 ] = tmp;
// FIXME: handling of offset seems incorrect. Should also handle READ-ONLY arrays.
return new x.constructor( getDType( x ), getData( x ), sh, st, strides2offset( sh, st ), getOrder( x ) ); // eslint-disable-line max-len
}
// EXPORTS //
module.exports = transpose;
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