Hi experts,
I have a RooWorkSpace “w” storied in a root file and inside the RooWorkSpace it has several RooDataHist, How can I read and draw these RooDataHist? I try as following, but it can’t work.
Thank you
Best regards
Hi,
when run the code it encounter error, it says:
warning: null passed to a callee that requires a non-null argument [-Wnonnull].
It seems the code didn’t read the RooDataHist in.