Frequently Asked Questions

-- Latest revision : 04/05/2009 --
-- See also Delphes website: 
--  http://www.fynu.ucl.ac.be/users/s.ovyn/Delphes/faq.html


(Q) Delphes complains that data/DataCardDet.dat is not found.
(A) In more recent version of the code (>1.4beta) the default names have been changed to DetectorCard.dat.
 Similarly, trigger cards are now called TriggerCard.dat


(Q) May I run the convertor stage independently before running Delphes?
(A) Yes, you can convert your generator-level input files, by running the 'Convertors_Only' executable:
        me@mylaptop:~$ ./Convertors_Only
	Usage: ./Convertors_Only input_file output_file
	input_list - list of files in Ntpl, StdHep of LHEF format,
	output_file - output file.
        me@mylaptop:~$ ./Convertors_Only TEST.list converted.root	


(Q) I did not create a LHCO output file when I ran Delphes (FLAG_lhco=0). Can I do this on my ROOT output file?
(A) The LHCO output file can be easily created out-of your Delphes ROOT output file, by running the 'LHCO_Only' executable:
	me@mylaptop:~$ ./LHCO_Only
	Usage: ./LHCO_Only input_file [runlog_file]
	input_file - file in Delphes root format,
	[runlog_file] - the corresponding log file (optional)
        me@mylaptop:~$ ./LHCO_Only test.root

(Q) I did not run the triggers when I ran Delphes (FLAG_trigger=0). Can I reprocess this on my output file?
(A) There is no problem to re-run the trigger on a Delphes output-file. Just run the 'Trigger_Only' executable:
	me@mylaptop:~$ ./Trigger_Only
	Usage: ./Trigger_Only input_file output_file [detector_card] [trigger_card]
	input_file - file in Delphe root format,
	trigger_card - Datacard containing the trigger algorithms (optional)
	me@mylaptop:~$ ./Trigger_Only test_without_trigger.root test_with_trigger.root data/mydetector.dat data/mytrigger.dat

(Q) From v1.9, Delphes allows both 1-prong and 3-prong tau-jets. How can I restrict the collection to 1-prong taus?
(A) Check the values of the number of tracks associated to the jets (Ntracks) in the tau collection

(Q) I do not remember how to run FROG
(A) Just run the "frog" executable in Utilities/FROG
	me@mylaptop:~$ cd Utilities/FROG
	me@mylaptop:~$ ./frog

(Q) frog executable is not found! ./Utilities/FROG/frog: No such file or directory
(A) you should have compiled FROG first.
	me@mylaptop:~$ cd Utilities/FROG
	me@mylaptop:~$ make

(Q) How should I know which external libraries I need for FROG ? 
(A) Please refer to this page on the FROG website:
	http://projects.hepforge.org/frog/Visualization.html
    you will need OpenGL, GLUT, X11-devel, Curl. For instance:
	OpenGL :
	  xorg-x11-Mesa-libGL-6.8.2-1.EL.33.0.2
	  xorg-x11-Mesa-libGLU-6.8.2-1.EL.33.0.2
	GLUT :
	  freeglut-2.2.0-14
	  freeglut-devel-2.2.0-14
	X11-devel :
	  xorg-x11-devel-6.8.2-1.EL.33.0.2
	CURL :
	  libcurl 


(Q) FROG complains that libcurl is missing. What should I do?
(A) First, make sure the libcurl library is installed on your computer.
 - locate it on your computer
	me@mylaptop:~$ locate libcurl.so
	/usr/lib/libcurl.so
 - if the library is not present, take it from the internet (http://curl.haxx.se/) or via installers like "apt-get" (ubuntu systems) or "yum" (fedora systems)
 - if the libcurl.so is not found, juste make a symbolic link in Utilities/FROG/Lib:
	me@mylaptop:~$ cd Utilities/FROG/Lib
	me@mylaptop:~$ ln -s /usr/lib/libcurl.so 
	me@mylaptop:~$ ls -l libcurl.so
	lrwxrwxrwx  1 me me 21 Jan  7 15:19 libcurl.so -> /usr/lib/libcurl.so.4.0.1
  - now it should work properly

(Q) (fixed) there are many lines printed at the end of the run of Delphes. Is it an error?
55555 D0
 - 20000 D0
 -  - 3000 (detId=900000000 Name=Delphes)
 -  -  - 3000 (detId=910000000 Name=Tracker)
 -  -  -  - 41040 (detId=9100010)
 -  -  -  - 41040 (detId=9100020)
 -  -  -  - 41040 (detId=9100030)
 -  -  -  - 41040 (detId=9100040)
...
(A) no, this is normal, this is just the output of FROG, showing that everything is ok.
You should find your *vis and *geom files when it has ended.


(Q) Delphes is not compiling properly on Mac OS-X
(A) One modification is required in the Makefile
In Delphes' genMakefile.tcl, you should add "-Dmacos " in the CXXFLAGS definition (line 219): 

CXXFLAGS += $(ROOTCFLAGS) -Dmacos -DDROP_CGAL -I. -Iinterface ...


(Q) FROG is not compiling properly on Mac OS-X
(A) One modification is required in FROG's Makefile
Open Utilities/FROG/Makefile. There, you should link the libcurl library in the compilation line of libfrog: 

Utilities/FROG/Makefile:
libfrog.dylib : $(OBJS)
        $(CXX) ... $(ARCHDEPENDENT) -lcurl -lX11 -lz -lpng -o $(LIBDIR)/$@
Do not forget to recompile FROG from its directory (Utilities/FROG) 
	me@mylaptop:~$ cd Utilities/FROG
	me@mylaptop:~$ make

(Q) At run time, _hepevet_ symbol is not found:
    dyld: Symbol not found: _hepevt_
    Referenced from: /usr/local/root/lib/libEG.dylib
    Expected in: dynamic lookup
 (or something similar)
(A) Your ROOT installation probably uses libEGPythia, which is not a default from ROOT.
    Just modify the definition of LIBS in the file genMakefile.tcl, by adding "-lEGPythia6" at the end
       LIBS = $(ROOTLIBS) -lEG $(SYSLIBS) -lEGPythia6
    then recompile Delphes : 
       me@mylaptop:~$ make clean
       me@mylaptop:~$ make