Ramp Function

Evaluate the ramp function.

The ramp function is defined as

or, alternatively, in terms of the max function

Usage

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

rampf( x )

Evaluates the ramp function.

var v = rampf( 3.14 );
// returns 3.14

v = rampf( -3.14 );
// returns 0.0

v = rampf( NaN );
// returns NaN

Examples

var linspace = require( '@stdlib/array/base/linspace' );
var rampf = require( '@stdlib/math/base/special/rampf' );

var x = linspace( -10.0, 10.0, 101 );

var i;
for ( i = 0; i < x.length; i++ ) {
    console.log( 'R(%d) = %d', x[ i ], rampf( x[ i ] ) );
}

C APIs

Usage

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

stdlib_base_rampf( x )

Evaluates the ramp function (single-precision).

float y = stdlib_base_rampf( 3.0f );
// returns 3.0f

The function accepts the following arguments:

x: [in] float input value.

float stdlib_base_rampf( const float x );

Examples

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

int main( void ) {
    const float x[] = { 3.14f, -3.14f, 0.0f, 0.0f/0.0f };

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