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    @stdlib/math-base-special-roundb
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    0.0.6 • Public • Published

    roundb

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    Round a numeric value to the nearest multiple of b^n on a linear scale.

    Installation

    npm install @stdlib/math-base-special-roundb

    Usage

    var roundb = require( '@stdlib/math-base-special-roundb' );

    roundb( x, n, b )

    Rounds a numeric value to the nearest multiple of b^n on a linear scale.

    // Round a value to 2 decimal places:
    var v = roundb( 3.141592653589793, -2, 10 );
    // returns 3.14
    
    // If n = 0 or b = 1, `roundb` behaves like `round`:
    v = roundb( 3.141592653589793, 0, 2 );
    // returns 3.0
    
    // Round a value to the nearest multiple of two:
    v = roundb( 5.0, 1, 2 );
    // returns 6.0

    Notes

    • Due to rounding error in floating-point numbers, rounding may not be exact. For example,

      var x = 0.2 + 0.1;
      // returns 0.30000000000000004
      
      // Should round to 0.3...
      var v = roundb( x, -16, 10 );
      // returns 0.3000000000000001

    Examples

    var randu = require( '@stdlib/random-base-randu' );
    var round = require( '@stdlib/math-base-special-round' );
    var pow = require( '@stdlib/math-base-special-pow' );
    var roundb = require( '@stdlib/math-base-special-roundb' );
    
    var x;
    var n;
    var b;
    var v;
    var i;
    
    for ( i = 0; i < 100; i++ ) {
        x = (randu()*100.0) - 50.0;
        n = round( (randu()*10.0) - 5.0 );
        b = round( randu()*10.0 );
        v = roundb( x, n, b );
        console.log( 'x: %d. %d^%d: %d. Rounded: %d.', x, b, n, pow( b, n ), v );
    }

    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.

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    License

    See LICENSE.

    Copyright

    Copyright © 2016-2022. The Stdlib Authors.

    Install

    npm i @stdlib/math-base-special-roundb

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    41

    Version

    0.0.6

    License

    Apache-2.0

    Unpacked Size

    40.2 kB

    Total Files

    9

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser