About stdlib...
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.
When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.
To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!
Absolute Value
Compute an absolute value of a signed 32-bit integer.
The absolute value is defined as
Installation
npm install @stdlib/math-base-special-labs
Usage
var labs = require( '@stdlib/math-base-special-labs' );
labs( x )
Computes an absolute value of a signed 32-bit integer.
var v = labs( -1|0 );
// returns 1
v = labs( 2|0 );
// returns 2
v = labs( 0|0 );
// returns 0
Notes
-
The implementation assumes two's complement.
-
In two's complement systems, the absolute value of the minimum signed 32-bit integer is out-of-range. The absolute value for the minimum signed 32-bit integer is thus undefined.
// -2^31 var x = -2147483648|0; var v = labs( x ); // returns -2147483648
Examples
var randu = require( '@stdlib/random-base-randu' );
var round = require( '@stdlib/math-base-special-round' );
var labs = require( '@stdlib/math-base-special-labs' );
var x;
var i;
for ( i = 0; i < 100; i++ ) {
x = round( randu() * 100.0 ) - 50;
console.log( 'abs(%d) = %d', x, labs( x|0 ) );
}
C APIs
Usage
#include "stdlib/math/base/special/labs.h"
stdlib_base_labs( x )
Computes the absolute value of a signed 32-bit integer in two's complement format.
#include <stdint.h>
int32_t y = stdlib_base_labs( -5 );
// returns 5
The function accepts the following arguments:
-
x:
[in] int32_t
input value.
int32_t stdlib_base_labs( const int32_t x );
Examples
#include "stdlib/math/base/special/labs.h"
#include <stdint.h>
#include <stdio.h>
int main( void ) {
const int32_t x[] = { 3, -3, 0, -10 };
int32_t y;
int i;
for ( i = 0; i < 4; i++ ) {
y = stdlib_base_labs( x[ i ] );
printf( "|%i| = %i\n", x[ i ], y );
}
}
See Also
-
@stdlib/math-base/special/abs
: compute the absolute value of a double-precision floating-point number.
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.
Community
License
See LICENSE.
Copyright
Copyright © 2016-2024. The Stdlib Authors.