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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Absolute Value
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Compute the [absolute value][absolute-value] of a double-precision floating-point number.
bash
npm install @stdlib/math-base-special-abs
javascript
var abs = require( '@stdlib/math-base-special-abs' );
#### abs( x )
Computes the [absolute value][absolute-value] of a double-precision floating-point number.
javascript
var v = abs( -1.0 );
// returns 1.0
v = abs( 2.0 );
// returns 2.0
v = abs( 0.0 );
// returns 0.0
v = abs( -0.0 );
// returns 0.0
v = abs( NaN );
// returns NaN
javascript
var randu = require( '@stdlib/random-base-randu' );
var round = require( '@stdlib/math-base-special-round' );
var abs = require( '@stdlib/math-base-special-abs' );
var rand;
var i;
for ( i = 0; i < 100; i++ ) {
rand = round( randu() * 100.0 ) - 50.0;
console.log( 'abs(%d) = %d', rand, abs( rand ) );
}
c
#include "stdlib/math/base/special/abs.h"
#### stdlib_base_abs( x )
Computes the absolute value of a double-precision floating-point number.
c
double y = stdlib_base_abs( -5.0 );
// returns 5.0
The function accepts the following arguments:
- x: [in] double input value.
c
double stdlib_base_abs( const double x );
c
#include "stdlib/math/base/special/abs.h"
#include <stdio.h>
int main( void ) {
const double x[] = { 3.14, -3.14, 0.0, 0.0/0.0 };
double y;
int i;
for ( i = 0; i < 4; i++ ) {
y = stdlib_base_abs( x[ i ] );
printf( "|%lf| = %lf\n", x[ i ], y );
}
}
@stdlib/math-base/special/abs2][@stdlib/math/base/special/abs2]: compute the squared absolute value of a double-precision floating-point number.
- [@stdlib/math-base/special/absf][@stdlib/math/base/special/absf]: compute the absolute value of a single-precision floating-point number.
- [@stdlib/math-base/special/labs][@stdlib/math/base/special/labs]: compute an absolute value of a signed 32-bit integer.
