Problems merging files with TChain

ROOT
1

Dear Rooters,

I have some problems using TChain::Merge() method.

Here there is my little script to merge files containing TTree “h_9000”

void MergeFiles()
  
{
  TChain ch2("h9000");

    Char_t *var = new Char_t[20];
    
    for (int run = 28; run <45; run++)
    {
    sprintf(var,"runE%d.root", run);
    ch2.Add(var);
    cout<<run<<endl;
    }
 
  ch2.Merge("runE.root");
 
}

This is the error message at the end :

Error: Symbol #include is not defined in current scope MergeFiles.C:37:
Error: Symbol exception is not defined in current scope MergeFiles.C:37:
Syntax Error: #include MergeFiles.C:37:
Error: Symbol G__exception is not defined in current scope MergeFiles.C:37:
Error: type G__exception not defined FILE:/home/usert/7Bedata/Root/./MergeFiles.C LINE:37
*** Interpreter error recovered ***

I’m not sure that the output file is correct.

Any idea? Memory leakage?

Thanks in advance.
Tina

2

The “MergeFiles” source code that you show has 17 lines.
The errors that you show come from line 37 (“MergeFiles.C:37”).

3

You’re right, but I’ve simply deleted some comments.

void MergeFiles()
  
{
  TChain ch2("h9000");
  
  
    Char_t *var = new Char_t[50];
    
    for (int run = 28; run <45; run++)
    {
    sprintf(var,"runE%d.root", run);
    ch2.Add(var);
    cout<<"File 'runE"<<run<<".root' added to the merge"<<endl;
    }
 
    ch2.Merge("runE_prova.root");
      
}

Error: Symbol #include is not defined in current scope MergeFiles.C:15:
Error: Symbol exception is not defined in current scope MergeFiles.C:15:
Syntax Error: #include MergeFiles.C:15:
Error: Symbol G__exception is not defined in current scope MergeFiles.C:15:
Error: type G__exception not defined FILE:/home/usert/7Bedata/Root/./MergeFiles.C LINE:15
*** Interpreter error recovered ***

As you can see the problems are at line 15, before “ch2.Merge(…)”.
I have an output file but I’m not that is really a good file.

Tina

4

Hi Tina,

Try again after compiling your script (add #include “TChain.h” and use .L MergeFiles.C+), if the problem is not related to CINT this should give us more precise information.

Also you may want to consider just using the executable hadd to do the work:

Cheers,
Philippe.

5

Hi Philippe,

thanks for your answer. :slight_smile:

Anyway, I have already tried to use hadd successfully.

Thanks.

Cheers,
Tina.