expp

double expp(double x, double b);

Returns the value of the Exponential random variable distribution function with mean b at the value x.

Parameters:
xCritical point.
bRate parameter.

Returns:
P(X ≤ x | b)

Errors:
NUMERICS_ERROR is raised if b ≤ 0

Usage:
double p = expp(.5, 1.5)

Header:
#include "contdist.h"