Return the strides of a provided ndarray.
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> Return the strides of a provided [ndarray][@stdlib/ndarray/base/ctor].
``bash`
npm install @stdlib/ndarray-base-strides
`javascript`
var strides = require( '@stdlib/ndarray-base-strides' );
#### strides( x, copy )
Returns the strides of a provided [ndarray][@stdlib/ndarray/base/ctor].
`javascript
var zeros = require( '@stdlib/ndarray-zeros' );
var x = zeros( [ 3, 2, 3 ] );
// returns
var st = strides( x, false );
// returns [ 6, 3, 1 ]
`
When copy is false, changes to the returned strides array may mutate the input [ndarray][@stdlib/ndarray/base/ctor] strides. If there is a chance that the returned strides will be mutated (either directly or by downstream consumers), set copy to true to prevent unintended side effects.
`javascript
var zeros = require( '@stdlib/ndarray-zeros' );
var x = zeros( [ 3, 2, 3 ] );
// returns
var st = strides( x, true );
// returns [ 6, 3, 1 ]
var bool = ( x.strides === st );
// returns false
`
`javascript
var zeros = require( '@stdlib/ndarray-zeros' );
var slice = require( '@stdlib/ndarray-slice' );
var E = require( '@stdlib/slice-multi' );
var S = require( '@stdlib/slice-ctor' );
var strides = require( '@stdlib/ndarray-base-strides' );
// Create an array:
var x = zeros( [ 10, 10, 10, 10 ] );
// returns
// Define some slices:
var slices = [
// :,:,:,:
E( null, null, null, null ),
// 5:10,4,2:4,::-1
E( S( 5, 10 ), 4, S( 2, 4 ), S( null, null, -1 ) ),
// :,:,2,:
E( null, null, 2, null ),
// 1,2,3,:
E( 1, 2, 3, null ),
// 1,3,::2,4::2
E( 1, 3, S( null, null, 2 ), S( 4, null, 2 ) )
];
// Determine the strides of each slice...
var s;
var i;
for ( i = 0; i < slices.length; i++ ) {
s = slice( x, slices[ i ] );
console.log( '(%s) => (%s)', x.strides.join( ',' ), strides( s, false ).join( ',' ) );
}
`
*
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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---
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