emptyLike

Create an uninitialized ndarray having the same shape and data type as a provided ndarray.

Installation

npm install @stdlib/ndarray-base-empty-like

Usage

var emptyLike = require( '@stdlib/ndarray-base-empty-like' );

emptyLike( x )

Creates an uninitialized ndarray having the same shape and data type as a provided ndarray.

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

var x = zeros( 'float64', [ 2, 2 ], 'row-major' );
// returns <ndarray>

var y = emptyLike( x );
// returns <ndarray>

var sh = y.shape;
// returns [ 2, 2 ]

Notes

• Along with data type, shape, and order, the function infers the "class" of the returned ndarray from the provided ndarray. For example, if provided a "base" ndarray, the function returns a base ndarray. If provided a non-base ndarray, the function returns a non-base ndarray.
• If the inferred output ndarray data type is 'generic', the function always returns a zero-filled ndarray.
• For returned ndarrays whose underlying memory is not initialized, memory contents are unknown and may contain sensitive data.

Examples

var dtypes = require( '@stdlib/ndarray-dtypes' );
var empty = require( '@stdlib/ndarray-base-empty' );
var emptyLike = require( '@stdlib/ndarray-base-empty-like' );

// Get a list of data types:
var dt = dtypes();

// Generate uninitialized arrays...
var x;
var y;
var i;
for ( i = 0; i < dt.length; i++ ) {
    x = empty( dt[ i ], [ 2, 2 ], 'row-major' );
    y = emptyLike( x );
    console.log( y.data );
}

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

License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.