Hi Colin, Could you provide your macro to have a quick look .... Cheers, Faouzi F. Attallah GSI mbH Planckstr 1 D-64291 Darmstadt Tel: +49 (0)6159 71 2743 Fax: +49 (0)6159 71 2901 Email: F.Attallah@gsi.de On Wed, 8 Dec 1999, C. Bernet wrote: > Hi all, > > I'm a new root adept (< 1week). Everything worked fine till i try to use > TMinuit to fit in a subrange of a 2d histogram. So I just copied and > modified the tutorial > http://root.cern.ch/root/html/examples/Ifit.C.html. > > When I use my macro, or the tutorial macro as it is given, I get this > message : > > FCN=0 FROM MIGRAD STATUS=INITIATE 149 CALLS 150 TOTAL > EDM= unknown STRATEGY= 1 NO ERROR MATRIX > EXT PARAMETER CURRENT GUESS STEP FIRST > NO. NAME VALUE ERROR SIZE DERIVATIVE > .... > MIGRAD MINIMIZATION HAS CONVERGED. > MIGRAD WILL VERIFY CONVERGENCE AND ERROR MATRIX. > > then : > > MINUIT WARNING IN HESSE > ============== > MNHESS FAILS AND WILL RETURN DIAGONAL MATRIX. > ... > > If you look at the current parameters using mnpout, you see that they > are equal to their starting values, and that errors are set to 1.41421. > > Thanks a lot if you can help me ! > > Colin > > >
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