Hello everyone,
I’m trying to merge 2 differents (TTree*) objects, with similar structure (branch1, branch2, branch3, branch4).
After merging using TTree::MergeList(treelist), I got a root file and when I open it, I got the following structure:
- branch1;31
- branch1;32
- branch2;1
- branch3;1
- branch4;1
Actually I have a huge amount of events for branch1 (12M), do you know if there is a limitation of size to merge TTree ? I cannot easily show an example here, as long as i’m using big files to be able to reproduce de problem…
When I use lower number of events everything is fine.
[code]#include <Riostream.h>
#include <TApplication.h>
#include <TCanvas.h>
#include <TH1F.h>
#include <TSystem.h>
#include <TSystemDirectory.h>
#include <TTree.h>
#include <TList.h>
#include <TFile.h>
using namespace std;
int main(int argc, char **argv)
{
if(argc != 2) {
cout << "[USAGE] " << argv[0] << " <path (e.g. path to rootfiles)>" << endl;
return 1;
}
TString path = argv[1];
if(! TString(gSystem->BaseName(path)).Length()) {
path = path.Remove(path.Length()-1);
}
TSystemDirectory dir(path, path);
vector<TFile*> flist;
TList *list0 = new TList, *list1 = new TList, *list2 = new TList, *list3 = new TList;
TList *files = dir.GetListOfFiles();
if (files) { TSystemFile *file;
TString fname;
TIter next(files);
while ((file=(TSystemFile*)next())) {
fname = file->GetName();
if (!file->IsDirectory() && fname.EndsWith("root")) {
TFile *frun = new TFile(path+"/"+fname, "READ");
if(frun == NULL || frun->IsZombie()) continue;
TTree *t0 = ((TTree*) frun->Get("branch1"));
TTree *t1 = ((TTree*) frun->Get("branch2"));
TTree *t2 = ((TTree*) frun->Get("branch3"));
TTree *t3 = ((TTree*) frun->Get("branch4"));
if(t0 != NULL) list0->Add(t0);
if(t1 != NULL) list1->Add(t1);
if(t2 != NULL) list2->Add(t2);
if(t3 != NULL) list3->Add(t3);
if(t0 == NULL || t1 == NULL || t2 == NULL || t3 == NULL)cout << "?";
else cout << ".";
cout.flush();
flist.push_back(frun);
}
}
}
cout << endl << "saving.. in " << path << ".root ";
cout.flush();
TFile *output = new TFile(path + ".root", "RECREATE");
if(list0->First() != NULL)
{
TTree *new_t0 = TTree::MergeTrees(list0);
new_t0->SetName("branch1");
new_t0->Write();
cout << ".";
cout.flush();
}
if(list1->First() != NULL)
{
TTree *new_t1 = TTree::MergeTrees(list1);
new_t1->SetName("branch2");
new_t1->Write();
cout << ".";
cout.flush();
}
if(list2->First() != NULL)
{
TTree *new_t2 = TTree::MergeTrees(list2);
new_t2->SetName("branch3");
new_t2->Write();
cout << ".";
cout.flush();
}
if(list3->First() != NULL)
{
TTree *new_t3 = TTree::MergeTrees(list3);
new_t3->SetName("branch4");
new_t3->Write();
cout << ".";
cout.flush();
}
cout << endl;
output->Close();
while( ! flist.empty() ){
flist.back()->Close();
flist.pop_back();
}
return 0;
}
[/code]
Btw how should I interprete these branch1;31 and branch2;32 ? Where are the ;1;2;3;4…;31 previous numbers ?
