Hi Rooters,
I work with ROOT 23/11 version on KCC. While I am debugging my analysis
codes, I discovered one mysterious thing. It looks like a bug, but I am
not so sure. If this is a bug, I hope it can be fixed in later version
since this is important in order to prevent big mistake sometimes. This
doesn't show error message and if we don't have any expectation on
analysis results, it might induce wrong interpretation of analysis.
I tried next two cases to fill histogram.
Case 1 :
When I fill abs(aaa-bbb) from my ntuple in this way :
MyTree->Draw("abs(aaa-bbb)>>MyHistogram",MyCut,"goff");
My histogram was O.K.
Case 2 :
When I did calculation first to fill my histogram in this way :
Float_t diff;
diff = abs(aaa-bbb) ; or diff = TMath::Abs(aaa-bbb);
MyHistogram->Fill(diff);
My histogram was so strange and I checked numbers with printing.
All numbers(diff) were changed into integers. Of course aaa and
bbb were also defined as Float_t.
Does anyone have the same experience as mine?
Minjeong
================================
Min Jeong Kim (CDF/KHCL)
E-mail : mjkim@fnal.gov
Office : CDF 137-B (X8473)
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