I've read about some similar problems in the digest, but most of them seemed to
involve histogramming, while mine simply involves accessing the values of
leaves of a tree. I setup a tree using the following syntax:
afile = new TFile("mc.root")
TTree *tt = afile.Get("t")
Unfortunately, my MC files are around 60 megs each, so I can't attach one. I
am working on creating a smaller file with a few good events and one or two bad
ones, but I'm still a novice with root. The problem happens with different
instances of different variables, but the first one on which I noticed it was
event #1431 of a variable called jetdata.ijet_phi. When I call
tt->Scan("jetdata.ijet_phi")
all values display properly, but if I call
tt->FindLeaf("jetdata.ijet_phi")->GetValue(1431)
I get:
Error: Symbol nan is not defined in current scope FILE: LINE:0
(const Double_t)nan
*** Interpreter error recovered ***
I have experienced this under versions 3.03/07, 3.03/09, and 3.05/03., all
under various versions of Linux. As I said, tt->Scan displays reasonable
looking values for the offending variables, and I can histogram them without
error, but accessing certain ones individually results in nan. Even if there
is no way to fix this, is there some way I can detect nan entries and simply
skip them when I am looping over the entire dataset?
Thanks,
Max Brustkern
This archive was generated by hypermail 2b29 : Thu Jan 01 2004 - 17:50:13 MET