N00b's Programming Machine

    @stdlib/utils-tabulate
    TypeScript icon, indicating that this package has built-in type declarations

    0.0.8 • Public • Published

    tabulate

    NPM version Build Status Coverage Status

    Generate a frequency table.

    Installation

    npm install @stdlib/utils-tabulate

    Usage

    var tabulate = require( '@stdlib/utils-tabulate' );

    tabulate( collection )

    Generates a frequency table.

    var arr = [ 'beep', 'boop', 'foo', 'beep' ];
    
    var out = tabulate( arr );
    // returns [ [ 'beep', 2, 0.5 ], [ 'boop', 1, 0.25 ], [ 'foo', 1, 0.25 ] ]

    The returned frequency table is an array of arrays. Each sub-array corresponds to a unique value in the input collection and is structured as follows:

    • 0: unique value
    • 1: value count
    • 2: frequency percentage

    Notes

    • A collection may be either an Array, Typed Array, or an array-like Object (excluding strings and functions).

    Examples

    var randu = require( '@stdlib/random-base-randu' );
    var floor = require( '@stdlib/math-base-special-floor' );
    var tabulate = require( '@stdlib/utils-tabulate' );
    
    var vals;
    var arr;
    var out;
    var i;
    var j;
    
    vals = [ 'beep', 'boop', 'foo', 'bar', 'woot', 'woot' ];
    
    // Generate a random collection...
    arr = new Array( 100 );
    for ( i = 0; i < arr.length; i++ ) {
        j = floor( randu()*vals.length );
        arr[ i ] = vals[ j ];
    }
    
    // Generate a frequency table:
    out = tabulate( arr );
    console.log( out );

    See Also


    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

    Chat


    License

    See LICENSE.

    Copyright

    Copyright © 2016-2022. The Stdlib Authors.

    Install

    npm i @stdlib/utils-tabulate

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    73

    Version

    0.0.8

    License

    Apache-2.0

    Unpacked Size

    40 kB

    Total Files

    9

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser