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Create an uninitialized ndarray having the same shape and data type as a provided ndarray.
npm install @stdlib/ndarray-empty-like
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var emptyLike = require( '@stdlib/ndarray-empty-like' );
Creates an uninitialized ndarray having the same shape and data type as a provided ndarray.
var getShape = require( '@stdlib/ndarray-shape' ); var getDType = require( '@stdlib/ndarray-dtype' ); var zeros = require( '@stdlib/ndarray-zeros' ); var x = zeros( [ 2, 2 ] ); // returns <ndarray>[ [ 0.0, 0.0 ], [ 0.0, 0.0 ] ] var y = emptyLike( x ); // returns <ndarray> var sh = getShape( y ); // returns [ 2, 2 ] var dt = String( getDType( y ) ); // returns 'float64'
The function supports the following options:
- dtype: output ndarray data type. Overrides the input ndarray's inferred data type.
- shape: output ndarray shape. Overrides the input ndarray's inferred shape.
- order: specifies whether the output ndarray should be
'row-major'(C-style) or'column-major'(Fortran-style). Overrides the input ndarray's inferred order. - mode: specifies how to handle indices which exceed array dimensions (see ndarray). Default:
'throw'. - submode: a mode array which specifies for each dimension how to handle subscripts which exceed array dimensions (see ndarray). If provided fewer modes than dimensions, the constructor recycles modes using modulo arithmetic. Default:
[ options.mode ].
To override either the dtype, shape, or order, specify the corresponding option. For example, to override the inferred data type,
var getShape = require( '@stdlib/ndarray-shape' ); var getDType = require( '@stdlib/ndarray-dtype' ); var zeros = require( '@stdlib/ndarray-zeros' ); var x = zeros( [ 2, 2 ] ); // returns <ndarray>[ [ 0.0, 0.0 ], [ 0.0, 0.0 ] ] var dt = String( getDType( x ) ); // returns 'float64' var y = emptyLike( x, { 'dtype': 'int32' }); // returns <ndarray> var sh = getShape( y ); // returns [ 2, 2 ] dt = String( getDType( y ) ); // returns 'int32'
- If the resolved output data type is
'generic', the function always returns a zero-filled array. - For returned ndarrays whose underlying memory is not initialized, memory contents are unknown and may contain sensitive data.
var dtypes = require( '@stdlib/ndarray-dtypes' ); var empty = require( '@stdlib/ndarray-empty' ); var ndarray2array = require( '@stdlib/ndarray-to-array' ); var emptyLike = require( '@stdlib/ndarray-empty-like' ); // Get a list of data types: var dt = dtypes( 'integer_and_generic' ); // Generate uninitialized arrays... var x; var y; var i; for ( i = 0; i < dt.length; i++ ) { x = empty( [ 2, 2 ], { 'dtype': dt[ i ] }); y = emptyLike( x ); console.log( ndarray2array( y ) ); }
@stdlib/ndarray-empty: create an uninitialized ndarray having a specified shape and data type.@stdlib/ndarray-zeros-like: create a zero-filled ndarray having the same shape and data type as a provided ndarray.
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.
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