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strided2array3d

Convert a strided array to a three-dimensional nested array.

Installation

npm install @stdlib/array-base-strided2array3d

Alternatively,

• To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
• If you are using Deno, visit the deno branch (see README for usage intructions).
• For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

var strided2array3d = require( '@stdlib/array-base-strided2array3d' );

strided2array3d( x, shape, strides, offset )

Converts a strided array to a three-dimensional nested array.

var x = [ 1, 2, 3, 4, 5, 6 ];

var arr = strided2array3d( x, [ 1, 3, 2 ], [ 6, 2, 1 ], 0 );
// returns [ [ [ 1, 2 ], [ 3, 4 ], [ 5, 6 ] ] ]

arr = strided2array3d( x, [ 1, 3, 2 ], [ 1, 1, 3 ], 0 );
// returns [ [ [ 1, 4 ], [ 2, 5 ], [ 3, 6 ] ] ]

The function accepts the following arguments:

• x: input array.
• shape: array shape.
• strides: dimension strides.
• offset: index of the first indexed value in the input array.

Notes

• The function assumes that the input array is compatible with the specified array shape, dimension strides, and index offset.

Examples

var zeroTo = require( '@stdlib/array-base-zero-to' );
var numel = require( '@stdlib/ndarray-base-numel' );
var shape2strides = require( '@stdlib/ndarray-base-shape2strides' );
var strided2array3d = require( '@stdlib/array-base-strided2array3d' );

var shape = [ 3, 3, 3 ];

var x = zeroTo( numel( shape ) );
console.log( x );

var y = strided2array3d( x, shape, shape2strides( shape, 'row-major' ), 0 );
console.log( y );

y = strided2array3d( x, shape, shape2strides( shape, 'column-major' ), 0 );
console.log( y );

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Notice

This package is part of 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, see the main project repository.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.