Exceptions on TH1::Add

Hi all,

I’d like to raise your attention to this issue that appeared in CMSSW:

Questions for the ROOT team are:

  • Was this behaviour recently changed? I could browse the history myself, but maybe somebody remembers.

  • Shouldn’t TMath::AreEqualAbs use a less-than-or-equal comparison, so that epsilon=0 can still succeed?

  • Any suggestions on how to check the compatibility of histograms for add/merge? Catching the exception is sort-of ok, but discouraged; the helpers like CheckConsistency are not public.



ROOT Version: 6.12/07 via CMSSW
Platform: CC7
Compiler: gcc

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