abs2

Compute the squared absolute value of a double-precision floating-point number.

Usage

var abs2 = require( '@stdlib/math/base/special/abs2' );

abs2( x )

Computes the squared absolute value of a double-precision floating-point number.

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

Examples

var randu = require( '@stdlib/random/base/randu' );
var round = require( '@stdlib/math/base/special/round' );
var abs2 = require( '@stdlib/math/base/special/abs2' );

var x;
var i;

for ( i = 0; i < 100; i++ ) {
    x = round( randu() * 100.0 ) - 50.0;
    console.log( 'abs2(%d) = %d', x, abs2( x ) );
}

C APIs

Usage

#include "stdlib/math/base/special/abs2.h"

stdlib_base_abs2( x )

Computes the squared absolute value of a double-precision floating-point number.

double y = stdlib_base_abs2( -5.0 );
// returns 25.0

The function accepts the following arguments:

x: [in] double input value.

double stdlib_base_abs2( const double x );

Examples

#include "stdlib/math/base/special/abs2.h"
#include <stdio.h>

int main() {
    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 );
    }
}