[ROOT] Question on fitting/ obtaining fit results

From: Alexander Dietz (Alexander.Dietz@mpi-hd.mpg.de)
Date: Tue Mar 09 2004 - 11:25:23 MET

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);

   // fitting
   TF1* f1=new TF1("func1","gaus",0,10);

   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?

This archive was generated by hypermail 2b29 : Sun Jan 02 2005 - 05:50:06 MET