Math Scalar Library
Programming Reference Manual C/C++
Version 1.1 DD-00003-011

22.15 seinst4 - Einstein function E4(x)

#include <msca.h> 
 
double seinst4 (double x); 
float  seinst4f(float x);

Given a value x this function computes the fourth Einstein function

E (x)= --x---log(1 -e-x)
 4    ex-1