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.
The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.
When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.
To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!
Return an element from an n-dimensional nested array.
To use in Observable,
atnd = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-atnd@umd/browser.js' )To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var atnd = require( 'path/to/vendor/umd/array-base-atnd/index.js' )To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/array-base-atnd@umd/browser.js"></script>If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.atnd;
})();
</script>Returns an element from an n-dimensional nested array.
var x = [ [ 1, 2 ], [ 3, 4 ] ];
var out = atnd( x, 0, 1 );
// returns 2
out = atnd( x, 1, 0 );
// returns 3The function accepts the following arguments:
- x: n-dimensional nested input array.
- i0: first dimension index.
- indices: dimension indices.
- Negative indices are resolved relative to the last element along the respective dimension, with the last element corresponding to
-1. - If provided out-of-bounds indices, the function always returns
undefined.
<!DOCTYPE html>
<html lang="en">
<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/utils-papply@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">
(function () {.factory;
var filled2dBy = require( '@stdlib/array-base-filled2d-by' );
var binary2d = require( '@stdlib/array-base-binary2d' );
var zeros2d = require( '@stdlib/array-base-zeros2d' );
var atnd = require( '@stdlib/array-base-atnd' );
var shape = [ 5, 5 ];
// Define a nested input array:
var x = filled2dBy( shape, discreteUniform( -100, 100 ) );
console.log( x );
// Define arrays containing random index values:
var i0 = filled2dBy( shape, discreteUniform( -shape[0], shape[0]-1 ) );
console.log( i0 );
var i1 = filled2dBy( shape, discreteUniform( -shape[1], shape[1]-1 ) );
console.log( i1 );
// Define an output array:
var out = zeros2d( shape );
console.log( out );
// Fill the output array with randomly selected values from the input array:
binary2d( [ i0, i1, out ], shape, papply( atnd, x ) );
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 © 2016-2024. The Stdlib Authors.