exp

Natural exponential function.

The natural exponential function is defined as

where e is Euler's number.

Usage

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

exp( x )

Evaluates the natural exponential function.

var v = exp( 4.0 );
// returns ~54.5982

v = exp( -9.0 );
// returns ~1.234e-4

v = exp( 0.0 );
// returns 1.0

v = exp( NaN );
// returns NaN

Examples

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

var x;
var i;

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

C APIs

Usage

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

stdlib_base_exp( x )

Evaluates the natural exponential function.

double out = stdlib_base_exp( 4.0 );
// returns ~54.5982

out = stdlib_base_exp( -9.0 );
// returns ~1.234e-4

The function accepts the following arguments:

x: [in] double input value.

double stdlib_base_exp( const double x );

Examples

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

int main( void ) {
    double x;
    double v;
    int i;
    
    for ( i = 0; i < 100; i++ ) {
        x = ( (double)rand() / (double)RAND_MAX ) * 100.0;
        v = stdlib_base_exp( x );
        printf( "e^%lf = %lf\n", x, v );
    }
}