@stdlib/math-base-special-ceilb NPM

ceilb

$NPM version$ $Build Status$ $Coverage Status$

Round a numeric value to the nearest multiple of b^n toward positive infinity.

Installation

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

Usage

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

ceilb( x, n, b )

Rounds a numeric value to the nearest multiple of b^n toward positive infinity.

// Round a value to 4 decimal places:
var v = ceilb( 3.141592653589793, -4, 10 );
// returns 3.1416

// If n = 0 or b = 1, `ceilb` behaves like `ceil`:
v = ceilb( 3.141592653589793, 0, 2 );
// returns 4.0

// Round a value to the nearest multiple of two toward positive infinity:
v = ceilb( 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 = ceilb( 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 ceilb = require( '@stdlib/math-base-special-ceilb' );

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 = ceilb( x, n, b );
    console.log( 'x: %d. %d^%d: %d. Rounded: %d.', x, b, n, pow( b, n ), v );
}

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.