RooHistPdf Objet can't live outside a class member function

ROOT
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1

Dear expert

I am using pyROOT to create RooHistPdf and use it.

The problem lies with the RooHistPdf object. It seems that even when I define it as self.pdf = RooHistPdf(), the content of RooHistPdf gets deleted once the member function completes, although the type of the instance is retained.

For example, when I define sigpdf in one function (HZZAnalysis/SignalModel/ConstructSiganl2l2q.py at cbf0b63514ad533371ce5ae470d9df8672f9d11f · jialin-guo1/HZZAnalysis · GitHub), I am unable to use it in another function (HZZAnalysis/SignalModel/ConstructSiganl2l2q.py at cbf0b63514ad533371ce5ae470d9df8672f9d11f · jialin-guo1/HZZAnalysis · GitHub). when I check the type of sigpdf outside the function. it is still a RooHistPdf but no content in it.

Best
Jialin

2

Dear Jialin,

as far as I can tell from the RooHistPdf documentation, it does not take ownership of the passed RooDataHist. Could you try storing it in self as well and see if that works?

Jonas

3

Indeed that should work!

There was recently another post with the same problem:
https://root-forum.cern.ch/t/problems-in-fitting-with-root-6-32