Issues running Delphes examples

[Vince Pascuzzi]

Hi,

I followed the README in order to install Delphes (simple enough). I then tried running a "Simple analysis using TTree::Draw" (also from README):

error: cannot use arrow operator on a type

I can open a TBrowser and everything is OK.

Furthermore, I cannot run any examples. When I try to run Example1.C as a macro, none of the Delphes externals can be found, e.g. ExRootTreeReader, nor the Delphes classes, e.g. Electron, Jet. The errors are:

allocation of incomplete type 'ExRootTreeReader/Jet/Electron'
member access into incomplete type '...

I have set my environment variables (at least I think they are correct), but I must be missing something. If any additional information is needed to diagnose the issues, please let me know.

All the best,

Vince.

Delphes-3.2.0
ROOT 6.02/05
OS X Yosemite 10.10.2

[Vince Pascuzzi]

Furthermore, when I try to run Example1 that is compiled in the Delphes install directory, all appears OK as it outputs each jet pt and at the end gives:

Info in <TCanvas::MakeDefCanvas>: created default TCanvas with name c1

however, no plot is displayed. The program executes without any hiccups however no ROOT plot is drawn (nothing appears).

Please advise.

Vince

OS X Yosemite 10.10.2
ROOT 6.02/05
Delphes-3.2.0

[Vince Pascuzzi]

Some output:

Vinces-MacBook-Pro:~ vincepascuzzi$ root -l /Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/Delphes-3.2.0/examples/Example1.C'("/Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/MY_PROCS/sm_pp_wpwm/Events/run_01/wpwm_ATLAS_7TeV_delphes_events.root")'
root [0] 
Processing /Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/Delphes-3.2.0/examples/Example1.C("/Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/MY_PROCS/sm_pp_wpwm/Events/run_01/wpwm_ATLAS_7TeV_delphes_events.root")...
In file included from input_line_24:1:
/Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/Delphes-3.2.0/examples/Example1.C:20:3: error: unknown type
      name 'ExRootTreeReader'
  ExRootTreeReader *treeReader = new ExRootTreeReader(&chain);
  ^
/Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/Delphes-3.2.0/examples/Example1.C:20:38: error: unknown type
      name 'ExRootTreeReader'
  ExRootTreeReader *treeReader = new ExRootTreeReader(&chain);
                                     ^
/Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/Delphes-3.2.0/examples/Example1.C:41:7: error: unknown type
      name 'Jet'
      Jet *jet = (Jet*) branchJet->At(0);
      ^
/Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/Delphes-3.2.0/examples/Example1.C:41:19: error: use of
      undeclared identifier 'Jet'
      Jet *jet = (Jet*) branchJet->At(0);
                  ^
/Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/Delphes-3.2.0/examples/Example1.C:41:23: error: expected
      expression
      Jet *jet = (Jet*) branchJet->At(0);
                      ^
/Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/Delphes-3.2.0/examples/Example1.C:50:5: error: unknown type
      name 'Electron'
    Electron *elec1, *elec2;
    ^
/Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/Delphes-3.2.0/examples/Example1.C:56:16: error: use of
      undeclared identifier 'Electron'
      elec1 = (Electron *) branchElectron->At(0);
               ^
/Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/Delphes-3.2.0/examples/Example1.C:56:26: error: expected
      expression
      elec1 = (Electron *) branchElectron->At(0);
                         ^
/Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/Delphes-3.2.0/examples/Example1.C:57:7: error: use of
      undeclared identifier 'elec2'
      elec2 = (Electron *) branchElectron->At(1);
      ^
/Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/Delphes-3.2.0/examples/Example1.C:57:16: error: use of
      undeclared identifier 'Electron'
      elec2 = (Electron *) branchElectron->At(1);
               ^
/Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/Delphes-3.2.0/examples/Example1.C:57:26: error: expected
      expression
      elec2 = (Electron *) branchElectron->At(1);
                         ^
/Users/vincepascuzzi/sw/MG5_aMC_v2_2_3/Delphes-3.2.0/examples/Example1.C:60:40: error: use of
      undeclared identifier 'elec2'
      histMass->Fill(((elec1->P4()) + (elec2->P4())).M());

[Pavel Demin]

Hi Vince,

Thanks for finding these problems.

All the examples were tested and are still working with ROOT 5. I did not test them with ROOT 6.

It looks like the command-line interface in ROOT 6 behaves very differently than in ROOT 5. It's less permissive and it's more verbose.

The example with Draw should now look like

root
gSystem->Load("libDelphes");

TFile::Open("delphes_output.root");
TTree *tree = (TTree *) gDirectory->Get("Delphes");
tree->Draw("Electron.PT");

At the moment, I don't see how to make Example1.C working. It seem that in ROOT 6 'gSystem->Load("libDelphes");' is not enough to make the Delphes classes appear in the list of classes known to ROOT.

The compiled version of Example1 is a quick demonstration of how to compile a ROOT macro that was requested in https://cp3.irmp.ucl.ac.be/projects/delphes/ticket/182

Cheers,

Pavel

[Pavel Demin]

I've just found a note confining that the following code does not work in ROOT 6:

void f() {gSystem->Load("libEvent"); Event* e = new Event();}

Here is the link

​https://root.cern.ch/drupal/content/way-root-6

[Vince Pascuzzi]

Hi Pavel,

Thank you for the input. I also added a post to the ROOT forum, perhaps a bit more detailed: ​https://root.cern.ch/phpBB3/viewtopic.php?f=3&t=19484&p=83255&hilit=Delphes%2FExRootAnalysis#p83255. Basically, I attempted to use ROOT5 but receive additional errors (found in link).

Please advise.

All the best,

Vince.

[Pavel Demin]

Hi Vince,

The error message that you posted on the ROOT forum

Symbol not found: _gInterpreterMutex
  Expected in: /Users/vincepascuzzi/sw/root/lib/libCore.so

clearly indicates a problem with your ROOT 5 installation or ROOT 5 related environment variables.

Could you check if the ROOTSYS, PATH and LD_LIBRARY_PATH point to the right locations and they don't point to the ROOT 5 and ROOT 6 locations at the same time?

Cheers,

Pavel

[Vince Pascuzzi]

Hi Pavel,

I included an env.txt in that post. Only a single version of ROOT is ever added to the environment at any time (as far as I can tell). Should a prebuilt binary of version 5 work? I do not compile in a very specific way, I only include pythia8.

Could it possibly be something else?

Thanks,

Vince.

[Pavel Demin]

Hi Vince,

When you switch ROOT versions do you rebuild Delphes?

I've just tested Delphes 3.2.0 with the following per-built versions:

​http://root.cern.ch/download/root_v5.34.28.macosx64-10.10-clang60.tar.gz

​http://root.cern.ch/download/root_v6.02.05.macosx64-10.10-i386.tar.gz

Both seem to work. I can run

tar -zxf Delphes-3.2.0.tar.gz
cd Delphes-3.2.0
make -j 4
curl http://cp3.irmp.ucl.ac.be/~demin/test.hepmc.gz | gunzip | ./DelphesHepMC cards/delphes_card_CMS.tcl delphes_output.root
root -l examples/Example1.C'("delphes_output.root")'

with ROOT 5.34.28 without any error messages.

Cheers,

Pavel

[Vince Pascuzzi]

Hi Pavel,

Well, that embarrassing...Could you kindly tell me whatever changes you made to your environment variables? Should it matter where Delphes is installed?

All the best,

Vince.

[Pavel Demin]

Here are the ROOT related lines from my .profile:

#export ROOTSYS=$HOME/root/root_v6.02.05.macosx64-10.10-i386
export ROOTSYS=$HOME/root/root_v5.34.28.macosx64-10.10-clang60
export PATH=$ROOTSYS/bin:$PATH
export PYTHONPATH=$ROOTSYS/lib:$PYTHONPATH
export LD_LIBRARY_PATH=$ROOTSYS/lib:$LD_LIBRARY_PATH

[Vince Pascuzzi]

Nothing to do with Delphes in your profile? I am giving it another shot now.

[Pavel Demin]

Normally, I run all the Delphes programs directly from the Delphes directory, so I don't configure any environment variables for Delphes.

[Vince Pascuzzi]

Empty ROOT plot from Example1.C

[Vince Pascuzzi]

Hi Pavel,

Adjusting my profile as you suggested I was able to run Example1.C, however the plot produced was empty (see attachment).

[EDIT]

That said, using my own Delphes output file the plot was populated. However, does the plot make sense? I'd like to be sure everything is copacetic before I move on past this. THAT said, I appreciate very much all your assistance and am happy to say I am much happier having this working.

Vince

[Vince Pascuzzi]

Example1.C run with my Delphes output.

[Pavel Demin]

Great! It's good to know that you can now run the examples.

The file that I was using for tests does not contain any electrons. So, it's normal that the plot is empty.

[Pavel Demin]

New version of the examples and EventDisplay now works with ROOT 6.04. It will be included in the next release.

[Michael Albergo]

Hi there Pavel,

Sorry to revive this, but I am having the same issue with ROOT6 now. Has the capacity for including libraries through code like gSystem->Load("libDelphes") work in any newer ROOT 6?

Are there any series limitations in earlier versions of Delphes other than 3.4.1 that would prevent me from simply simulation qcd events in a detector? I ask because only older versions of delphes seem compatible with older root.

Thanks,
Michael

[Pavel Demin]

Sorry to revive this, but I am having the same issue with ROOT6 now.

Please provide more details about your setup: OS version, C++ compiler version, ROOT version, how ROOT was installed, Delphes version.