@stdlib/ndarray-base-shape

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shape

Return the shape of a provided ndarray.

Installation

npm install @stdlib/ndarray-base-shape

Usage

var shape = require( '@stdlib/ndarray-base-shape' );

shape( x, copy )

Returns the shape of a provided ndarray.

var zeros = require( '@stdlib/ndarray-zeros' );

var x = zeros( [ 3, 2, 3 ] );
// returns <ndarray>

var sh = shape( x, false );
// returns [ 3, 2, 3 ]

When copy is false, changes to the returned shape array may mutate the input ndarray shape. If there is a chance that the returned shape will be mutated (either directly or by downstream consumers), set copy to true to prevent unintended side effects.

var zeros = require( '@stdlib/ndarray-zeros' );

var x = zeros( [ 3, 2, 3 ] );
// returns <ndarray>

var sh = shape( x, true );
// returns [ 3, 2, 3 ]

var bool = ( x.shape === sh );
// returns false

Examples

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 shape = require( '@stdlib/ndarray-base-shape' );

// Create an array:
var x = zeros( [ 10, 10, 10, 10 ] );
// returns <ndarray>

// 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 shape of each slice...
var s;
var i;
for ( i = 0; i < slices.length; i++ ) {
    s = slice( x, slices[ i ] );
    console.log( 'slice(%s) => %s', x.shape.join( 'x' ), shape( s, false ).join( 'x' ) );
}

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.

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License

See LICENSE.

Copyright

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