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Replace elements of an array with provided values according to a provided mask array.
npm install @stdlib/array-mskputAlternatively,
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var mskput = require( '@stdlib/array-mskput' );Replaces elements of an array with provided values according to a provided mask array.
var x = [ 1, 2, 3, 4 ];
var out = mskput( x, [ 1, 0, 1, 0 ], [ 20, 40 ] );
// returns [ 1, 20, 3, 40 ]
var bool = ( out === x );
// returns trueThe function supports the following parameters:
- x: input array.
- mask: mask array.
- values: values to set.
- options: function options.
The function supports the following options:
- mode: string specifying behavior when the number of
valuesdoes not equal the number of falsymaskvalues. Default:'repeat'.
The function supports the following modes:
'strict': specifies that the function must raise an exception when the number ofvaluesdoes not exactly equal the number of falsymaskvalues.'non_strict': specifies that the function must raise an exception when the function is provided insufficientvaluesto satisfy themaskarray.'strict_broadcast': specifies that the function must broadcast a single-elementvaluesarray and otherwise raise an exception when the number ofvaluesdoes not exactly equal the number of falsymaskvalues.'broadcast': specifies that the function must broadcast a single-elementvaluesarray and otherwise raise an exception when the function is provided insufficientvaluesto satisfy themaskarray.'repeat': specifies that the function must reuse providedvalueswhen replacing elements inxin order to satisfy themaskarray.
In broadcasting modes, the function supports broadcasting a values array containing a single element against the number of falsy values in the mask array.
var x = [ 1, 2, 3, 4 ];
var out = mskput( x, [ 1, 0, 1, 0 ], [ 20 ], {
'mode': 'strict_broadcast'
});
// returns [ 1, 20, 3, 20 ]
var bool = ( out === x );
// returns trueIn repeat mode, the function supports recycling elements in a values array to satisfy the number of falsy values in the mask array.
var x = [ 1, 2, 3, 4 ];
var out = mskput( x, [ 0, 0, 1, 0 ], [ 20, 40 ], {
'mode': 'repeat'
});
// returns [ 20, 40, 3, 20 ]
var bool = ( out === x );
// returns true- The function mutates the input array
x. - If a
maskarray element is falsy, the corresponding element inxis replaced; otherwise, the corresponding element inxis "masked" and thus left unchanged. - The
valuesarray must have a data type which can be safely cast to the input array data type. Floating-point data types (both real and complex) are allowed to downcast to a lower precision data type of the same kind (e.g., element values from a'float64'values array can be assigned to corresponding elements in a'float32'input array).
var filledBy = require( '@stdlib/array-base-filled-by' );
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var bernoulli = require( '@stdlib/random-base-bernoulli' );
var linspace = require( '@stdlib/array-base-linspace' );
var mskput = require( '@stdlib/array-mskput' );
// Generate a linearly spaced array:
var x = linspace( 0, 100, 11 );
console.log( x );
// Generate a random mask array:
var N = discreteUniform( 5, 15 );
var mask = filledBy( N, bernoulli.factory( 0.3 ) );
console.log( mask );
// Generate an array of random values:
var values = filledBy( N, discreteUniform.factory( 1000, 2000 ) );
console.log( values );
// Update a random sample of elements in `x`:
var out = mskput( x, mask, values );
console.log( out );@stdlib/array-place: replace elements of an array with provided values according to a provided mask array.@stdlib/array-put: replace specified elements of an array with provided values.@stdlib/array-take: take elements from an array.
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.
See LICENSE.
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