Hi Pascal, Currently, TH1 or TGraph::Fit cannot make nested fits. All TH1 or TGraph objects share the same fitter. Support for nested fits would require each object having its own fitter. I would not like to implement this by default because fitters are quite fat objects, but it could be an option for cases like yours. Could you send me a subset of your example ? Rene Brun Pascal Perrodo wrote: > > Hi, > > I am doing the following: > in a c++ code, compiled and linked with the ROOT libraries, I use the > class TMinuit to minimize a fonction f(x). In order to compute the value > of f(x) I need to perform auxilliary fits on a temporary histogram of > Graph g. When I do this the program systematically crashes when I call > g->Fit() in the code of the function f(x). It seems that I cannot call two > minimizations using Minuit at the same time. > Any clues for this problem ? Many thanks in advance, > > Pascal Perrodo. > > +-------------------------------------------------------------------------+ > | Tel : 04 50 09 16 32 (from France), 00 33 4 50 09 16 32 (from abroad) | > | FAX : 04 50 27 94 95 (from France), 00 33 4 50 27 94 95 (from abroad) | > | | > | LAPP, Chemin de Bellevue, BP 110, F-74941 Annecy-le-Vieux CEDEX | > +-------------------------------------------------------------------------+
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