Hi Tim, Could you send me a tar file with teh strict minimum to reproduce the problem? Rene Brun On Tue, 2 Sep 2003, Tim Nelson wrote: > Greetings, > > I am trying to use TFractionFitter to fit a pair of simple > distributions. With loose cuts, I have done this without significant > problems. With slightly tighter cuts (so somewhat lower statistics in > the distributions but *no* zero bins) the fit procedure not only never > converges, but seems to go into an infinite loop somwhere. Even when I > access the fit and set maximum iterations to 100, it just sits and > grinds up CPU after the message: > > FIRST CALL TO USER FUNCTION AT NEW START POINT, WITH IFLAG=4. > > When it works, it converges instantaneously. Has anyone else seen this > kind of behavior? Things I should try? > > Thanks, > Tim Nelson > Fermilab >
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