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Overview
LCIO collections of Tracks and other objects can be read into ROOT using the LCIO C++ API.
These are instructions for setting up LCIO and ROOT to work with each other.
Packages
LCIO
...
lcio.desy.de
...
ROOT
...
root.cern.ch
...
CMake
...
cmake.org
...
I
...
use
...
the
...
LCIO
...
trunk
...
from
...
June
...
28
...
2012,
...
ROOT
...
version
...
5.34,
...
and
...
CMake
...
2.8.6,
...
and
...
I
...
am
...
building
...
on
...
a
...
64-bit
...
RHEL
...
5.8
...
machine.
...
These
...
instructions
...
should
...
work
...
on
...
most
...
varieties
...
of
...
Linux,
...
will
...
probably
...
work
...
on
...
OSX
...
(not
...
tried
...
yet),
...
and
...
might
...
work
...
on
...
Windows
...
with
...
some
...
modifications
...
(not
...
covered
...
here).
...
Setup
...
and
...
Build
...
Commands
...
Any
...
command
...
that
...
starts
...
with
...
"export"
...
will
...
generally
...
need
...
to
...
be
...
re-executed
...
to
...
run
...
the
...
various
...
examples
...
that
...
I
...
cover
...
below.
...
Setup
...
the
...
ROOT
...
environment.
...
I
...
do
...
not
...
cover
...
how
...
to
...
build
...
and
...
install
...
ROOT.
| No Format |
|---|
} export ROOTSYS=/my/root # put path to your ROOT here source $ROOTSYS/bin/thisroot.sh export PATH=$ROOTSYS/bin:$PATH {noformat} |
Build
...
LCIO
...
with
...
the
...
ROOT
...
class
...
dictionaries.
| No Format |
|---|
} cd /a/work/dir svn co svn://svn.freehep.org/lcio/trunk lcio/trunk cd lcio/trunk mkdir build; cd build cmake -D BUILD_ROOTDICT=1 -D ROOT_DIR=$ROOTSYS .. make install export LCIO=`pwd` export LD_LIBRARY_PATH=$LCIO/lib:$ROOTSYS/lib {noformat} |
Once
...
ROOT
...
and
...
LCIO
...
are
...
setup,
...
you'll
...
want
...
to
...
create
...
a
...
setup
...
script
...
that
...
contains
...
something
...
like
...
the
...
following...
| No Format |
|---|
} export ROOTSYS=/my/root # put path to your ROOT here source $ROOTSYS/bin/thisroot.sh export PATH=$ROOTSYS/bin:$PATH export LCIO=/path/to/lcio/trunk/build export LD_LIBRARY_PATH=$LCIO/lib:$ROOTSYS/lib {noformat} |
You
...
can
...
call
...
this
...
script
...
'mysetup.sh'.
...
This
...
should
...
allow
...
you
...
to
...
execute
...
the
...
examples
...
covered
...
below.
...
You
...
will
...
need
...
to
...
execute
...
'source
...
mysetup.sh'
...
from
...
your
...
shell
...
before
...
proceeding
...
with
...
your
...
analysis
...
session.
...
Basic
...
Analysis
...
Test
| No Format |
|---|
} cd ../examples/cpp/rootDict root .L anajob.C anajob("/nfs/slac/g/hps3/data/testrun/runs/recon/hps_001365.evio.0-rec.slcio") {noformat} h2. Example Event Dump The |
Example Event Dump
The anajob.C
...
example
...
should
...
produce
...
event
...
dumps
...
that
...
look
...
like
...
this...
| No Format |
|---|
} /////////////////////////////////// EVENT: 442 RUN: 0 DETECTOR: HPS-TestRun-v2 COLLECTIONS: (see below) /////////////////////////////////// --------------------------------------------------------------------------- COLLECTION NAME COLLECTION TYPE NUMBER OF ELEMENTS =========================================================================== ConfirmedMCParticles MCParticle 0 EcalCalHits CalorimeterHit 0 EcalClusters Cluster 0 EcalReadoutHits RawCalorimeterHit 3 FPGAData LCGenericObject 7 HelicalTrackHitRelations LCRelation 10 HelicalTrackHits TrackerHit 5 HelicalTrackMCRelations LCRelation 0 MatchedTracks Track 1 RotatedHTHRelation LCRelation 5 RotatedHelicalTrackHits TrackerHit 5 RotatedMCRelations LCRelation 0 SVTFittedRawTrackerHits LCRelation 135 SVTRawTrackerHits TrackerRawData 135 SVTShapeFitParameters LCGenericObject 135 SeededMCParticles MCParticle 0 StripClusterer_SiTrackerHitStrip1DTrackerHit 10 TriggerBank LCGenericObject 1 --------------------------------------------------------------------------- {noformat} h2. Example Analysis I have modified the LCIO copy of |
Example Analysis
I have modified the LCIO copy of anajob.C
...
to
...
produce
...
some
...
histograms
...
from
...
Track
...
information.
...
This
...
script
...
can
...
be
...
accessed
...
here.
It can be used as a basis for further analysis work.
Writing and Reading ROOT Files
The example writeEventTree.C can be used to produce a ROOT output file.
First the environment needs to be setup so that ROOT can find the LCIO class dictionary.
| No Format |
|---|
|http://www.slac.stanford.edu/~jeremym/hps/anajob.C]. It can be used as a basis for further analysis work. h2. Writing and Reading ROOT Files The example writeEventTree.C can be used to produce a ROOT output file. First the environment needs to be setup so that ROOT can find the LCIO class dictionary. gSystem->Load("${LCIO}/lib/liblcio.so"); gSystem->Load("${LCIO}/lib/liblcioDict.so"); |
Then
...
from
...
the
...
ROOT
...
command
...
line...
| No Format |
|---|
.L writeEventTree.C writeEventTree("/nfs/slac/g/hps3/data/testrun/runs/recon/hps_001365.evio.0-rec.slcio"); |
This
...
will
...
write
...
the
...
file
...
lcioEventTree.root
...
in
...
the
...
current
...
directory.
...
Now
...
load
...
a
...
browser
...
to
...
look
...
at
...
the
...
file.
| No Format |
|---|
TBrowser b; |
Or
...
try
...
to
...
read
...
it
...
back.
| No Format |
|---|
.L readEventTree.C readEventTree("lcioEventTree.root") |
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