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* @license Apache-2.0
*
* Copyright (c) 2023 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 args2multislice = require( '@stdlib/slice/base/args2multislice' );
var Slice = require( '@stdlib/slice/ctor' );
var slice = require( '@stdlib/ndarray/base/slice' );
var nulls = require( '@stdlib/array/base/nulls' );
var ndims = require( '@stdlib/ndarray/base/ndims' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns a view of an input ndarray in which the order of elements along a specified dimension is reversed.
*
* @param {ndarray} x - input array
* @param {integer} dim - index of dimension to reverse
* @param {boolean} writable - boolean indicating whether a returned array should be writable
* @throws {TypeError} first argument must be an ndarray having one or more dimensions
* @throws {RangeError} dimension index exceeds the number of dimensions
* @returns {ndarray} ndarray view
*
* @example
* var ndarray = require( '@stdlib/ndarray/ctor' );
* var getShape = require( '@stdlib/ndarray/shape' );
*
* var buffer = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
* var shape = [ 3, 2 ];
* var strides = [ 2, 1 ];
* var offset = 0;
*
* var x = ndarray( 'generic', buffer, shape, strides, offset, 'row-major' );
* // returns <ndarray>[ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]
*
* var sh = getShape( x );
* // returns [ 3, 2 ]
*
* var y = reverseDimension( x, 0, false );
* // returns <ndarray>[ [ 5.0, 6.0 ], [ 3.0, 4.0 ], [ 1.0, 2.0 ] ]
*
* sh = getShape( y );
* // returns [ 3, 2 ]
*/
function reverseDimension( x, dim, writable ) {
var args;
var N;
var d;
// Retrieve the number of array dimensions:
N = ndims( x );
// Check whether we were provided a zero-dimensional array...
if ( N === 0 ) {
throw new TypeError( format( 'invalid argument. First argument must be an ndarray having one or more dimensions. Number of dimensions: %d.', N ) );
}
// Normalize the dimension index...
d = dim;
if ( d < 0 ) {
d += N;
if ( d < 0 ) {
throw new RangeError( format( 'invalid argument. Dimension index exceeds the number of dimensions. Number of dimensions: %d. Value: `%d`.', N, dim ) );
}
} else if ( d >= N ) {
throw new RangeError( format( 'invalid argument. Dimension index exceeds the number of dimensions. Number of dimensions: %d. Value: `%d`.', N, dim ) );
}
// Define a list of MultiSlice constructor arguments:
args = nulls( N );
args[ d ] = new Slice( null, null, -1 );
// Return a new array view:
return slice( x, args2multislice( args ), true, writable );
}
// EXPORTS //
module.exports = reverseDimension;
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