@stdlib/array-base-map3d
v0.2.2
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Apply a function to elements in a three-dimensional nested input array and assign results to elements in a new three-dimensional nested output array.
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map3d
Apply a function to elements in a three-dimensional nested input array and assign results to elements in a new three-dimensional nested output array.
Installation
npm install @stdlib/array-base-map3d
Usage
var map3d = require( '@stdlib/array-base-map3d' );
map3d( x, shape, fcn[, thisArg] )
Applies a function to elements in a three-dimensional nested input array and assigns results to elements in a new three-dimensional nested output array.
var naryFunction = require( '@stdlib/utils-nary-function' );
var abs = require( '@stdlib/math-base-special-abs' );
var x = [ [ [ -1.0, -2.0 ], [ -3.0, -4.0 ] ] ];
var shape = [ 1, 2, 2 ];
var y = map3d( x, shape, naryFunction( abs, 1 ) );
// returns [ [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ] ]
The function accepts the following arguments:
- x: input nested array.
- shape: array shape.
- fcn: function to apply.
- thisArg: applied function execution context (optional).
To set the applied function's execution context, provide a thisArg
.
function fcn( x ) {
this.count += 1;
return x;
}
var x = [ [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ] ];
var shape = [ 1, 2, 2 ];
var ctx = {
'count': 0
};
var y = map3d( x, shape, fcn, ctx );
// returns [ [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ] ]
var v = ctx.count;
// returns 4
map3d.assign( x, y, shape, fcn[, thisArg] )
Applies a function to elements in a three-dimensional nested input array and assigns results to elements in a three-dimensional nested output array.
var naryFunction = require( '@stdlib/utils-nary-function' );
var zeros3d = require( '@stdlib/array-base-zeros3d' );
var abs = require( '@stdlib/math-base-special-abs' );
var x = [ [ [ -1.0, -2.0 ], [ -3.0, -4.0 ] ] ];
var shape = [ 1, 2, 2 ];
var y = zeros3d( shape );
var out = map3d.assign( x, y, shape, naryFunction( abs, 1 ) );
// returns [ [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ] ]
var bool = ( out === y );
// returns true
The function accepts the following arguments:
- x: input nested array.
- y: output nested array.
- shape: array shape.
- fcn: function to apply.
- thisArg: applied function execution context (optional).
The function assumes that the input and output arrays have the same shape.
Examples
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' ).factory;
var filled3dBy = require( '@stdlib/array-base-filled3d-by' );
var naryFunction = require( '@stdlib/utils-nary-function' );
var abs = require( '@stdlib/math-base-special-abs' );
var map3d = require( '@stdlib/array-base-map3d' );
var shape = [ 3, 3, 3 ];
var x = filled3dBy( shape, discreteUniform( -100, 100 ) );
console.log( x );
var y = map3d( x, shape, naryFunction( abs, 1 ) );
console.log( y );
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.