pdiff

Return the positive difference between x and y.

Usage

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

pdiff( x, y )

Returns the positive difference between x and y if x < y; otherwise, returns 0.

var v = pdiff( 4.2, 3.14 );
// returns 1.06

v = pdiff( 3.14, 4.2 );
// returns +0.0

v = pdiff( -0.0, +0.0 );
// returns +0.0

If any argument is NaN, the function returns NaN.

var v = pdiff( 4.2, NaN );
// returns NaN

v = pdiff( NaN, 3.14 );
// returns NaN

v = pdiff( NaN, NaN );
// returns NaN

Notes

This function is the equivalent of fdim in the C/C++ standard library.

Examples

var minstd = require( '@stdlib/random/base/minstd-shuffle' );
var pdiff = require( '@stdlib/math/base/special/pdiff' );

var x;
var y;
var v;
var i;

for ( i = 0; i < 100; i++ ) {
    x = minstd();
    y = minstd();
    v = pdiff( x, y );
    console.log( 'pdiff(%d,%d) = %d', x, y, v );
}

C APIs

Usage

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

stdlib_base_pdiff( x, y )

Returns the positive difference between x and y.

double v = stdlib_base_pdiff( 4.0, 3.0 );
// returns 1.0

The function accepts the following arguments:

x: [in] double input value.
y: [in] double input value.

double stdlib_base_pdiff( const double x, const double y );

Examples

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

int main( void ) {
    const double x[] = { 3.0, 4.0, 6.0, 5.0 };

    double y;
    int i;
    for ( i = 0; i < 4; i += 2 ) {
        y = stdlib_base_pdiff( x[ i ], x[ i+1 ] );
        printf( "pdiff(%lf, %lf) = %lf\n", x[ i ], x[ i+1 ], y );
    }
}