stdlib-js
<summary>
About stdlib...
</summary>
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.
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Round
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Round a numeric value to the nearest integer.
bash
npm install @stdlib/math-base-special-round
javascript
var round = require( '@stdlib/math-base-special-round' );
#### round( x )
Rounds a numeric value to the nearest integer.
javascript
var v = round( -4.2 );
// returns -4.0
v = round( -4.5 );
// returns -4.0
v = round( -4.6 );
// returns -5.0
v = round( 9.99999 );
// returns 10.0
v = round( 9.5 );
// returns 10.0
v = round( 9.2 );
// returns 9.0
v = round( 0.0 );
// returns 0.0
v = round( -0.0 );
// returns -0.0
v = round( Infinity );
// returns Infinity
v = round( -Infinity );
// returns -Infinity
v = round( NaN );
// returns NaN
javascript
var randu = require( '@stdlib/random-base-randu' );
var round = require( '@stdlib/math-base-special-round' );
var x;
var i;
for ( i = 0; i < 100; i++ ) {
x = (randu()*100.0) - 50.0;
console.log( 'Value: %d. Rounded: %d.', x, round( x ) );
}
c
#include "stdlib/math/base/special/round.h"
#### stdlib_base_round( x )
Rounds a numeric value to the nearest integer.
c
double out = stdlib_base_round( -4.2 );
// returns -4.0
The function accepts the following arguments:
- x: [in] double input value.
c
double stdlib_base_round( const double x );
c
#include "stdlib/math/base/special/round.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_round( x[ i ] );
printf( "round(%lf) = %lf\n", x[ i ], v );
}
}
@stdlib/math-base/special/ceil][@stdlib/math/base/special/ceil]: round a double-precision floating-point number toward positive infinity.
- [@stdlib/math-base/special/floor][@stdlib/math/base/special/floor]: round a double-precision floating-point number toward negative infinity.
- [@stdlib/math-base/special/roundn][@stdlib/math/base/special/roundn]: round a double-precision floating-point number to the nearest multiple of 10^n.
- [@stdlib/math-base/special/trunc][@stdlib/math/base/special/trunc]: round a double-precision floating-point number toward zero.
