Upper-tail probability of Chi-Squared Distribution

From: Urs Langenegger (ursl@SLAC.stanford.edu)
Date: Thu Sep 10 1998 - 05:30:24 MEST 

I have  a small function calculating for  some data a chi^2  with some
degrees of freedom. I am interested  in the confidence level.  I tried
to find the equivalent of the CERNLIB function PROB in the ROOT source
code, but I didn't find it. I searched the website, without success. 

Is   there a way to get   the CL without  having to  build my own root
executable (such that I can access PROB) or do the integration myself?

Any hint would be appreciated,

--U.

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