I am having a problems with CINT and ROOT. I have a function which declares a number of histograms (TH1F's). In the previous version of ROOT the code worked fine, but since we have upgraded, something broke. Specifically, there seems to be a problem with the TTree variable (fChain is the variable name) and the Histogram declarations. I added lines like this to my function to "debug" the value of fChain. cout << "This is (1) " << fChain << endl; Here is some code where I think things are breaking: ===================================================== cout << "This is (5) " << fChain << endl; //Declare Histograms Delta_R = new TH1F("Matched_Delta_R","Delta R of matched generated electrons", nbins1,0,7.5); ... cout << "This is (6) " << fChain << endl; ===================================================== Here is the corresponding output when I run this code: ===================================================== This is (1) 0x8829380 This is (2) 0x8829380 This is (3) 0x8829380 This is (4) 0x8829380 This is (5) 0x8829380 Error: No symbol fChain in current scope FILE:/home/skwang/Proj4/Pmcsana1.C LINE:84 This is (6) 0 Error: No symbol fChain in current scope FILE:/home/skwang/Proj4/Pmcsana1.C LINE:90 Error: Failed to evaluate fChain->GetEntry(jentry) FILE:/home/skwang/Proj4/Pmcsana1.C LINE:90 Possible candidates are... filename line:size busy function type and name ====================================================== As you can see the variable fChain is fine for the first 5 instances, but as soon as I declare my histograms the variable "dies." Line 84 is: cout << "This is (6) " << fChain << endl; Consequently, in line 90 when I need to use the variable fChain, my program fails. Line 90 is: nb = fChain->GetEntry(jentry); If I remove all my histogram declarations from my function the program runs fine. I am using ROOT version2.26/00 on a Linux (FermiLab) machine at the University of Maryland. Thanks in advance, Shawn Kwang
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