Problem with AddFriend

ROOT
1

Hi,

(ROOT 5.13/03)

To get right to the core of my problem:
I want to friend two chains but somehow it doesn’t work out.

I tried the following:

#include "TChain.h"

TChain *c1;
TChain *f1;

void test_friend(){
    c1 = new TChain("TB/tree");
    f1 = new TChain("CalibHit/LArCalibHit");

    c1->Add( "rfio:///castor/cern.ch/user/n/ngollub/ATLAS/ctb_simulation/12.0.1/ctb_run2096_e9000_pid211/ntp_ctb_run2096_e9000_pid211_evt*.root" );
    f1->Add( "rfio:///castor/cern.ch/user/n/ngollub/ATLAS/ctb_simulation/12.0.1/ctb_run2096_e9000_pid211/ntp_ctb_run2096_e9000_pid211_evt*.root" );

    c1->Print();
    f1->Print();

    c1->AddFriend( f1, "alias" );

    c1->Print( "_LAr*" );
}

… each of the chains is printed just as normal, but after “friending” them together I can’t access the data-members of the second chain through the first one.

What am I doing wrong?

thanks,
Peter

2

TChain::Print() does not (yet) print information about its friends …

Cheers,
Philippe

3

thanks,

I didn’t even think of trying to access the variables when Print() didn’t work :smiley:
I should have tried it… it works fine.

  • peter