Ramp Function

Evaluate the ramp function.

The ramp function is defined as

upper R left-parenthesis x right-parenthesis equals StartLayout Enlarged left-brace 1st Row 1st Column x 2nd Column if x greater-than-or-equal-to 0 2nd Row 1st Column 0 2nd Column if x less-than 0 EndLayout

or, alternatively, in terms of the max function

upper R left-parenthesis x right-parenthesis equals max left-parenthesis x comma 0 right-parenthesis

Usage

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

ramp( x )

Evaluates the ramp function.

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

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

v = ramp( NaN );
// returns NaN

Examples

var linspace = require( '@stdlib/math/utils/linspace' );
var ramp = require( '@stdlib/math/base/special/ramp' );

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

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