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Round a numeric value to the nearest power of two on a linear scale.
npm install @stdlib/math-base-special-round2
Alternatively,
- To load the package in a website via a
script
tag without installation and bundlers, use the ES Module available on theesm
branch (see README). - If you are using Deno, visit the
deno
branch (see README for usage intructions). - For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the
umd
branch (see README).
The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.
To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.
var round2 = require( '@stdlib/math-base-special-round2' );
Rounds a numeric
value to the nearest power of two on a linear scale.
var v = round2( -4.2 );
// returns -4.0
v = round2( -4.5 );
// returns -4.0
v = round2( -4.6 );
// returns -4.0
v = round2( 9.99999 );
// returns 8.0
v = round2( 9.5 );
// returns 8.0
v = round2( 13.0 );
// returns 16.0
v = round2( -13.0 );
// returns -16.0
v = round2( 0.0 );
// returns 0.0
v = round2( -0.0 );
// returns -0.0
v = round2( Infinity );
// returns Infinity
v = round2( -Infinity );
// returns -Infinity
v = round2( NaN );
// returns NaN
var randu = require( '@stdlib/random-base-randu' );
var round2 = require( '@stdlib/math-base-special-round2' );
var x;
var v;
var i;
for ( i = 0; i < 100; i++ ) {
x = (randu()*100.0) - 50.0;
v = round2( x );
console.log( 'Value: %d. Rounded: %d.', x, v );
}
#include "stdlib/math/base/special/round2.h"
Rounds a numeric
value to the nearest power of two on a linear scale.
double out = stdlib_base_round2( -4.2 );
// returns -4.0
The function accepts the following arguments:
- x:
[in] double
input value.
double stdlib_base_round2( const double x );
#include "stdlib/math/base/special/round2.h"
#include <stdio.h>
int main( void ) {
const double x[] = { -5.0, -3.89, -2.78, -1.67, -0.56, 0.56, 1.67, 2.78, 3.89, 5.0 };
double v;
int i;
for ( i = 0; i < 10; i++ ) {
v = stdlib_base_round2( x[ i ] );
printf( "round2(%lf) = %lf\n", x[ i ], v );
}
}
@stdlib/math-base/special/ceil2
: round a numeric value to the nearest power of two toward positive infinity.@stdlib/math-base/special/floor2
: round a numeric value to the nearest power of two toward negative infinity.@stdlib/math-base/special/round
: round a numeric value to the nearest integer.@stdlib/math-base/special/round10
: round a numeric value to the nearest power of 10 on a linear scale.
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.