Hi,
I’ve made a TTree of objects I have defined. When I try to Scan them though, depending on how I do the Scan, I get an “index to high” error. Can someone please tell me what I am doing wrong?
First my class.
TT.h:
#ifndef TT_H
#define TT_H
#include <iostream>
#include "TROOT.h"
#include "TObject.h"
#define NMAX 10
using namespace std;
class TT: public TObject
{
public:
Int_t a;
Int_t b[NMAX];
TT();
void Clear();
Int_t getB(Int_t i) const;
void setB(Int_t i, Int_t x);
ClassDef(TT, 1);
};
#endifTT.cxx:
#include "TT.h"
ClassImp(TT)
TT::TT()
{
Clear();
}
void TT::Clear()
{
a = 0;
for (Int_t i = 0; i < NMAX; i++)
b[i] = 0;
}
Int_t TT::getB(Int_t i) const
{
if (i < NMAX)
return b[i];
cerr << "Invalid index (" << i << ")" << endl;
return -1;
}
void TT::setB(Int_t i, Int_t x)
{
if (i < NMAX)
b[i] = x;
else
cerr << "Invalid index (" << i << ")" << endl;
}TTLinkDef.h:
#ifdef __CINT__
#pragma link off all globals;
#pragma link off all classes;
#pragma link off all functions;
#pragma link C++ class TT+;
#endifI compile like this to create a shared library, libTT.so:
g++ -g -c `root-config --cflags` -fPIC -I. TT.cxx
rootcint -f TTDict.C -c -I. TT.h TTLinkDef.h
g++ -g -c TTDict.C `root-config --cflags` -fPIC -I.
g++ -g -shared TT.o TTDict.o -o libTT.soand finally my test program, t.cxx:
#include <cstdlib>
#include "TROOT.h"
#include "TFile.h"
#include "TTree.h"
#include "TT.h"
int main(int argc, char **argv)
{
int i, n;
TFile *rootFile = new TFile("t.root", "recreate");
TT *tt = new TT();
TTree *tree = new TTree("tree", "test tree");
tree->Branch("TTBranch", "TT", &tt);
for (n = 0; n < NMAX; n++)
{
tt->Clear();
tt->a = n;
for (i = 0; i < NMAX; i++)
tt->setB(i, tt->a*10 + i);
tree->Fill();
}
rootFile->Write();
rootFile->Close();
exit(0);
}which I compile like this:
g++ -g `root-config --cflags` -o t t.cxx ./libTT.so `root-config --libs`My problem is now if I use Scan with no arguments I get “index too high errors”:
root [0] gSystem->Load("./libTT.so");
root [1] TFile f("t.root")
root [2] tree->Scan()
Error in <TTreeFormula::TTreeFormula>: Index 10 for dimension #1 in TTBranch.b[10].b is too high (max is 9)
************************************************************
* Row * TTBranch. * TTBranch. * TTBranch. * TTBranch. *
************************************************************
* 0 * 0 * 50331648 * 0 * *
* 1 * 0 * 50331648 * 1 * *
* 2 * 0 * 50331648 * 2 * *
* 3 * 0 * 50331648 * 3 * *
* 4 * 0 * 50331648 * 4 * *
* 5 * 0 * 50331648 * 5 * *
* 6 * 0 * 50331648 * 6 * *
* 7 * 0 * 50331648 * 7 * *
* 8 * 0 * 50331648 * 8 * *
* 9 * 0 * 50331648 * 9 * *
************************************************************
(Long64_t)10If I specify the columns to output, the error “goes away” and all rows are printed (here I just “q” but it does work if you want to print them all out):
root [3] tree->Scan("a:b")
***********************************************
* Row * Instance * a * b *
***********************************************
* 0 * 0 * 0 * 0 *
* 0 * 1 * 0 * 1 *
* 0 * 2 * 0 * 2 *
* 0 * 3 * 0 * 3 *
* 0 * 4 * 0 * 4 *
* 0 * 5 * 0 * 5 *
* 0 * 6 * 0 * 6 *
* 0 * 7 * 0 * 7 *
* 0 * 8 * 0 * 8 *
* 0 * 9 * 0 * 9 *
* 1 * 0 * 1 * 10 *
* 1 * 1 * 1 * 11 *
* 1 * 2 * 1 * 12 *
* 1 * 3 * 1 * 13 *
* 1 * 4 * 1 * 14 *
* 1 * 5 * 1 * 15 *
* 1 * 6 * 1 * 16 *
* 1 * 7 * 1 * 17 *
* 1 * 8 * 1 * 18 *
* 1 * 9 * 1 * 19 *
* 2 * 0 * 2 * 20 *
* 2 * 1 * 2 * 21 *
* 2 * 2 * 2 * 22 *
* 2 * 3 * 2 * 23 *
* 2 * 4 * 2 * 24 *
Type <CR> to continue or q to quit ==> q
***********************************************
(Long64_t)25Is there something wrong with how I wrote my code? I’m afraid to use these trees when I see an error like this because I wonder if I’m really filling them correctly and if I will read out the correct values. This is just a test case of a more general tree that I’ve written that contains much more data.
Thanks in advance for any advice,
William