Hi Ben, The TTree constructor expects two arguments (name,title). You give only one argument. Do, eg TTree *tree = new TTree("tree","tree title"); Rene Brun Ben Morgan wrote: > > Thanks Philippe, > I should have remembered, I'm using ROOT v3.01/06 on an > Intel PC running Red Hat 6.2. > Yes, Glen's codes run fine when run as macros in an interactive session, > but simply cutting and pasting them into a very simplistic C++ code like: > > #include<iostream.h> > #include<iomanip.h> > #include<fstream.h> > #include<stdio.h> > #include <stdlib.h> > #include<math.h> > > //ROOT Headers > #include "TROOT.h" > #include "TFile.h" > #include "TNetFile.h" > #include "TRandom.h" > #include "TTree.h" > #include "TBranch.h" > #include "TClonesArray.h" > #include "TStopwatch.h" > > int main(int argc, char **argv) > { > > Float_t na[10][10]; > TFile file("adc.root"); > TTree *tree = new TTree("tree"); > > TBranch *b = tree->GetBranch("adc"); > TLeaf *l = b->GetLeaf("adc"); > tree->SetBranchAddress("adc",&na); > > for (Int_t i=0; i<150; i++) { > b->GetEvent(i); > printf("na[1][1] = %f, ",na[1][1]); > } > > return 0; > } > > This doesn't compile. The problem seems to be with the line: > TTree *tree = new TTree("tree"); > This doesn't appear in Glen's code, but something like this appears to be > neccessary in a C++ program otherwise the compiler complains about 'tree' > being undefined in the next line, i.e. leaving this line out produces: > > twodread.C: In function `int main(int, char **)': > twodread.C:25: `tree' undeclared (first use this function) > > on compilation. Equally, using a line like > > TTree *tree = (TTree*)file->Get("tree") > > as used in the examples of reading trees in the manual doesn't compile > properly either. Hope this makes things clearer, > > Thanks, > > Ben Morgan. > > -- > ------------------------------------------------------------------------------- > Mr. Ben Morgan > Postgraduate Student > University of Sheffield > Department of Physics & Astronomy > Hicks Building > Hounsfield Road > Sheffield S3 7RH > -------------------------------------------------------------------------------
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