You have a problem with the second argument "dummy". Instead of char* dummy; you should declare char dummy[100]; (dimension must be bigger than the longest parameter name Rene Brun Alexander Dietz wrote: > > Hi Rooters > > I am working with ROOT -Version 3.10. and I am trying to obtain some > fit-results (the values 'vlow' and 'vhigh'). Thetefore I am using the > method TVirtualFitter::GetParameter(Int_t ipar, char* name, Double_t& > value, Double_t& verr, Double_t& vlow, Double_t& vhigh) > > My program: > > // creating histogram > TH1F* h1=new TH1F("h1","histo from a gaussian",100,-3,3); > h1->FillRandom("gaus",10000); > > // fitting > TF1* f1=new TF1("func1","gaus",0,10); > h1->Fit("func1"); > > char* dummy; > Double_t v1=0; > Double_t v2=0; > Double_t v3=0; > Double_t v4=0; > > // getting current fitter > TVirtualFitter* hFitter = TVirtualFitter::GetFitter(); > > // *** segmentation fault here *** > hFitter->GetParameter(1, dummy, v1, v2, v3, v4); > > Why do I have a segmentation fault when trying to obtain the fit-results?
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