double expint(int n, double x);
Evaluates the exponential integral En(x).
Parameters:
n | ? |
---|---|
x | ? |
Returns:
En(x)
Errors:
NUMERICS_ERROR
is raised if n < 0, if x < 0, if n = x = 0, or if x = 0 and n = 1.
Header:
#include "mathx.h"