Combined fit with pyroot

ROOT
1

Hi,

I’m a beginner in using ROOT and pyROOT but I have a working code to fit a scattered gaussian to a TF1 function. However I’m now trying to do a combined fit on a few TF1 functions with one or two common parameters of the same function.
I saw a tutorial in C++
root.cern.ch/root/html/tutorials … Fit.C.html
but I’m not sure on how to translate that to python (especially the GlobalChi2 struct). I searched in this forum and on the web but has anyone did this before?

Any references or advices on which function to look at would be greatly appreciated.

Thanks,
Greg

2

Hi,

haven’t tried, but the FitFCN function of the Fitter class is “pythonized” and can thus take any callable python object (or function), so implementing a class with a call method should do the trick.

Cheers,
Wim