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Scatter a list of provided values to specified indices in a new zero-filled "generic" array.
To use in Observable,
scattered = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-scattered@umd/browser.js' )To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var scattered = require( 'path/to/vendor/umd/array-base-scattered/index.js' )To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/array-base-scattered@umd/browser.js"></script>If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.scattered;
})();
</script>Scatters a list of provided values to specified indices in a new zero-filled "generic" array.
var out = scattered( 4, [ 1, 3 ], [ 20, 40 ], 'throw' );
// returns [ 0, 20, 0, 40 ]The function supports the following parameters:
- len: output array length.
- indices: list of indices.
- values: values to scatter. When
indicescontains one or more elements,valuesmust be broadcast compatible withindices(i.e., must have either one element or the same number of elements asindices). - mode: index mode.
If indices is an empty array, the function returns a zero-filled array.
var out = scattered( 4, [], [ 20, 40 ], 'throw' );
// returns [ 0, 0, 0, 0 ]The function supports broadcasting a values array containing a single element against an indices array containing one or more elements.
var out = scattered( 4, [ 1, 3 ], [ 20 ], 'throw' );
// returns [ 0, 20, 0, 20 ]<!DOCTYPE html>
<html lang="en">
<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/array-base-filled-by@umd/browser.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/random-base-discrete-uniform@umd/browser.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/array-base-scattered@umd/browser.js"></script>
<script type="text/javascript">
(function () {
// Generate an array of random indices:
var N = discreteUniform( 5, 15 );
var indices = filledBy( N, discreteUniform.factory( 0, 10 ) );
console.log( indices );
// Generate an array of random values:
var values = filledBy( N, discreteUniform.factory( 1000, 2025 ) );
console.log( values );
// Scatter a random sample of elements to a new array:
var out = scattered( 11, indices, values, 'throw' );
console.log( out );
})();
</script>
</body>
</html>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.
Copyright © 2016-2025. The Stdlib Authors.
