Compute the squared absolute value of a double-precision floating-point number.
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> Compute the squared [absolute value][absolute-value] of a double-precision floating-point number.
``bash`
npm install @stdlib/math-base-special-abs2
`javascript`
var abs2 = require( '@stdlib/math-base-special-abs2' );
#### abs2( x )
Computes the squared [absolute value][absolute-value] of a double-precision floating-point number.
`javascript
var v = abs2( -1.0 );
// returns 1.0
v = abs2( 2.0 );
// returns 4.0
v = abs2( 0.0 );
// returns 0.0
v = abs2( -0.0 );
// returns 0.0
v = abs2( NaN );
// returns NaN
`
`javascript
var discreteUniform = require( '@stdlib/random-array-discrete-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var abs2 = require( '@stdlib/math-base-special-abs2' );
var x = discreteUniform( 100, -50, 50, {
'dtype': 'float64'
});
logEachMap( 'abs2(%d) = %d', x, abs2 );
`
*
`c`
#include "stdlib/math/base/special/abs2.h"
#### stdlib_base_abs2( x )
Computes the squared absolute value of a double-precision floating-point number.
`c`
double y = stdlib_base_abs2( -5.0 );
// returns 25.0
The function accepts the following arguments:
- x: [in] double input value.
`c`
double stdlib_base_abs2( const double x );
`c
#include "stdlib/math/base/special/abs2.h"
#include
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_abs2( x[ i ] );
printf( "abs2(%lf) = %lf\n", x[ i ], y );
}
}
`
*
- [@stdlib/math-base/special/abs][@stdlib/math/base/special/abs]: compute the absolute value of a double-precision floating-point number.
- [@stdlib/math-base/special/abs2f][@stdlib/math/base/special/abs2f]: compute the squared absolute value of a single-precision floating-point number.
*
This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[absolute-value]: https://en.wikipedia.org/wiki/Absolute_value
[@stdlib/math/base/special/abs]: https://www.npmjs.com/package/@stdlib/math-base-special-abs
[@stdlib/math/base/special/abs2f]: https://www.npmjs.com/package/@stdlib/math-base-special-abs2f