About stdlib...
We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.
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Take elements from an indexed array.
To use in Observable,
takeIndexed = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-take-indexed@umd/browser.js' )To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var takeIndexed = require( 'path/to/vendor/umd/array-base-take-indexed/index.js' )To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/array-base-take-indexed@umd/browser.js"></script>If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.takeIndexed;
})();
</script>Takes elements from an indexed array.
var x = [ 1, 2, 3, 4 ];
var y = takeIndexed( x, [ 1, 3 ] );
// returns [ 2, 4 ]If indices is an empty array, the function returns an empty array.
var x = [ 1, 2, 3, 4 ];
var y = takeIndexed( x, [] );
// returns []- The function does not perform bounds checking. If an index is less than zero or greater than the maximum index of
x, the value of the corresponding element in the output array is undefined. - An indexed array-like object is a data structure in which one retrieves elements via integer indices using bracket
[]notation (e.g.,Float64Array,Int32Array,Array, etc). This is in contrast to an accessor array-like object in which one retrieves elements usinggetandsetmethods (e.g.,Complex64ArrayandComplex128Array).
<!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-linspace@umd/browser.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/array-base-take-indexed@umd/browser.js"></script>
<script type="text/javascript">
(function () {
// Generate a linearly spaced array:
var x = linspace( 0, 100, 11 );
// Generate an array of random indices:
var N = discreteUniform( 5, 15 );
var indices = filledBy( N, discreteUniform.factory( 0, x.length-1 ) );
// Take a random sample of elements from `x`:
var y = takeIndexed( x, indices );
console.log( x );
console.log( indices );
console.log( y );
})();
</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 © 2016-2024. The Stdlib Authors.