How to get rid of "exponential integral function, Ei(x)" in symbolic math integrartion?!

Hi,

I'm trying to calculate the integral of the following f(x) in MATLAB:

f(x) = -m/(x*e^mx)

When I write something like this:

syms x m e

int(-m/(x*(e^(m*x))), x)

I get my answwer as a function of exponential integral function, which is ans = m*Ei(1, m*x*log(e))

How can I get rid of Ei(x) and find an exact solution to my problem?

Thanks

[Torsten]

This is the analytic solution to your problem. Ei is a function like sin, exp or others, only less known:

http://de.mathworks.com/help/matlab/ref/expint.html

Best wishes

Torsten.

[Antonio]

Thanks Torsten ...

[Walter Roberson]

You probably want

int(-m/(x*(exp(m*x))), x)

You will still get Ei but you will get a simpler solution that does not depend upon the undefined symbol e