Hi,
now I am back with new problems.
I have expanded the my script to the case of simultaneously fitting two equal model functions which have 3 parameters each of which they have 1 in common.
I oriented myself on the example another user has posted here
[url]Simultaneous hist fit; ROOT::Math::IMultiGenFunction trouble
This was of great help since it is my plan to make the script applicable for an arbitrary number of equal model functions of which all share 1 common parameter which is what I tried to do.
I can compile the script and everything works so far just not the fitting.
The error message I get is:
GSLNLSMinimizer: Invalid function set - only Chi2Func supported
Error in ROOT::Math::GSLNLSMinimizer::Minimize: Function has not been set
Error: Empty FitResult !
For me it is not clear why this happens since everything is very similar to the tutorial
http://root.cern.ch/root/html/tutorials/fit/combinedFit.C.html
Could you please have a look on my code one more time? I think you could directly see where I am going wrong.
I attached my code and the two necessary files for fitting.
Best regards,
Chris
fit_mass_table_beta_6_qmass_0.03_tc_WL.dat (561 Bytes)
fit_mass_table_beta_6_qmass_0.03_tc_Pion.dat (565 Bytes)
TestCombFit.C (7.05 KB)