pdifff

Return the positive difference between x and y.

Usage

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

pdifff( x, y )

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

var v = pdifff( 4.15, 3.15 );
// returns 1.0

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

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

If any argument is NaN, the function returns NaN.

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

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

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

Notes

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

Examples

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

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

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

C APIs

Usage

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

stdlib_base_pdifff( x, y )

Returns the positive difference between x and y (single-precision).

float v = stdlib_base_pdifff( 4.0f, 3.0f );
// returns 1.0f

The function accepts the following arguments:

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

float stdlib_base_pdifff( const float x, const float y );

Examples

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

int main() {
    float x[] = { 3.0f, 4.0f, 6.0f, 5.0f };

    float y;
    int i;
    for ( i = 0; i < 4; i += 2 ) {
        y = stdlib_base_pdifff( x[ i ], x[ i+1 ] );
        printf( "pdifff(%f, %f) = %f\n", x[ i ], x[ i+1 ], y );
    }
}