Hi Bertalan, All what you describe is automatic when calling MIGRAD. Rene Brun On Sat, 12 Jan 2002, [iso-8859-1] Juhász Bertalan wrote: > Hi Rene, > > > The option to call "SIMPLEX" could be easily added. I am just curious > > to know why you want to use SIMPLEX instead of MIGRAD (MIGRAD calls > > SIMPLEX internally). > > I want to use SIMPLEX because my professor wants me to do so... (That's > quite a strong argument, isn't it?) According to him, SIMPLEX can find a > minimum more easily than MIGRAD if the initial parameters are very much off. > He wants to obtain a first guess of the parameters with SIMPLEX and then > feed these parameter values to MIGRAD. But if you are right then we really > do not need to start with SIMPLEX. > > Cheers, > > Bertalan > > > > > > Note that you can call directly the Minuit function mnsimp > > via gMinuit->mnsimp(). You can see examples of direct calls to Minuit > > or the TFitter in $ROOTSYS/tutorials/Ifit.C > > > > Rene Brun > > > > Bertalan Juhasz wrote: > > > > > > Dear Rooters, > > > > > > I would like to fit histograms starting with the SIMPLEX method instead > of > > > the default MIGRAD (which if called by TH1::Fit()). Is there a way to do > > > this? A SIMPLEX function is persent in TMinuit but I couldn't figure out > > > how to access and use it. > > > > > > Thanks in advance, > > > > > > Cheers, > > > > > > Bertalan > > > >
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