Return a view of an input ndarray in which the order of elements along a specified dimension is reversed.
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> Return a view of an input ndarray in which the order of elements along a specified dimension is reversed.
``bash`
npm install @stdlib/ndarray-base-reverse-dimension
`javascript`
var reverseDimension = require( '@stdlib/ndarray-base-reverse-dimension' );
#### reverseDimension( x, dim, writable )
Returns a view of an input ndarray in which the order of elements along a specified dimension is reversed.
`javascript
var ndarray = require( '@stdlib/ndarray-ctor' );
var ndarray2array = require( '@stdlib/ndarray-to-array' );
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
var sh = x.shape;
// returns [ 3, 2 ]
var arr = ndarray2array( x );
// returns [ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]
var y = reverseDimension( x, 0, false );
// returns
sh = y.shape;
// returns [ 3, 2 ]
arr = ndarray2array( y );
// returns [ [ 5.0, 6.0 ], [ 3.0, 4.0 ], [ 1.0, 2.0 ] ]
`
The function accepts the following arguments:
- x: input ndarray.
- dim: index of dimension along which to reverse elements. If provided an integer less than zero, the dimension index is resolved relative to the last dimension, with the last dimension corresponding to the value -1.
- writable: boolean indicating whether a returned ndarray should be writable.
- The writable parameter only applies to ndarray constructors supporting read-only instances.
`javascript
var array = require( '@stdlib/ndarray-array' );
var ndarray2array = require( '@stdlib/ndarray-to-array' );
var zeroTo = require( '@stdlib/array-base-zero-to' );
var reverseDimension = require( '@stdlib/ndarray-base-reverse-dimension' );
// Create a linear ndarray buffer:
var buf = zeroTo( 16 );
// Create a three-dimensional ndarray:
var x = array( buf, {
'shape': [ 2, 4, 2 ]
});
// Reverse the order of first axis:
var y0 = reverseDimension( x, 0, false );
// returns
var a0 = ndarray2array( y0 );
// returns [ [ [ 8, 9 ], [ 10, 11 ], [ 12, 13 ], [ 14, 15 ] ], [ [ 0, 1 ], [ 2, 3 ], [ 4, 5 ], [ 6, 7 ] ] ]
// Reverse the order of second axis:
var y1 = reverseDimension( x, 1, false );
// returns
var a1 = ndarray2array( y1 );
// returns [ [ [ 6, 7 ], [ 4, 5 ], [ 2, 3 ], [ 0, 1 ] ], [ [ 14, 15 ], [ 12, 13 ], [ 10, 11 ], [ 8, 9 ] ] ]
// Reverse the order of third axis:
var y2 = reverseDimension( x, 2, false );
// returns
var a2 = ndarray2array( y2 );
// returns [ [ [ 1, 0 ], [ 3, 2 ], [ 5, 4 ], [ 7, 6 ] ], [ [ 9, 8 ], [ 11, 10 ], [ 13, 12 ], [ 15, 14 ] ] ]
`
*
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
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