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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
I use the LCIO trunk from June 28 2012, ROOT version 5.34, and CMake
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2.8.6,
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and
...
I
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am
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building
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on
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a
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64-bit
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RHEL
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5.8
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machine.
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These
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instructions
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should
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work
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on
...
most
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varieties
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of
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Linux,
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will
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probably
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work
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on
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OSX
...
(not
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tried
...
yet),
...
and
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might
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work
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on
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Windows
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with
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some
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modifications
...
(not
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covered
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here).
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Setup
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and
...
Build
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Commands
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Any
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command
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that
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starts
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with
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"export"
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will
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generally
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need
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to
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be
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re-executed
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to
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run
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the
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various
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examples
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that
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I
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cover
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below.
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Setup
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the
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ROOT
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environment.
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I
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do
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not
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cover
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how
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to
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build
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and
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install
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ROOT.
| No Format |
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{noformat} export ROOTSYS=/my/root # put path to your ROOT here source $ROOTSYS/bin/thisroot.sh export PATH=$ROOTSYS/bin:$PATH {noformat} |
Build
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LCIO
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with
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the
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ROOT
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class
...
dictionaries.
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{noformat} cd /a/work/dir svn co svn://svn.freehep.org/lcio/trunk lcio/trunk cd lcio/trunk mkdir build; cd build cmake -D BUILD_ROOTDICT=1 -D ROOT_DIR=$ROOTSYS .. make install cd ../ export LCIO=`pwd` export LD_LIBRARY_PATH=$LCIO/lib:$ROOTSYS/lib {noformat} |
Once
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ROOT
...
and
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LCIO
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are
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setup,
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you'll
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want
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to
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create
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a
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setup
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script
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that
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contains
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something
...
like
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the
...
following...
| No Format |
|---|
{noformat} 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
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can
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call
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this
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script
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'mysetup.sh'.
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This
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should
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allow
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you
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to
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execute
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the
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examples
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covered
...
below.
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You
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will
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need
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to
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execute
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'source
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mysetup.sh'
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from
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your
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shell
...
before
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proceeding
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with
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your
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analysis
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session.
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Basic
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Analysis
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Test
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|---|
{noformat} 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
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example
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should
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produce
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event
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dumps
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that
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look
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like
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this...
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{noformat} /////////////////////////////////// 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
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produce
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some
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histograms
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from
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Track
...
information. This example reads a collection from an LCIO file and creates a collection of Tracks. Then it histograms some basic information from these objects. 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 |
|---|
This script can be accessed [here|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
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from
...
the
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ROOT
...
command
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line...
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|---|
.L writeEventTree.C writeEventTree("/nfs/slac/g/hps3/data/testrun/runs/recon/hps_001365.evio.0-rec.slcio"); |
This
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will
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write
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the
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file
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lcioEventTree.root
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in
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the
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current
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directory.
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Now
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load
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a
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browser
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to
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look
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at
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the
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file.
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TBrowser b; |
Or
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try
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to
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read
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it
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back.
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.L readEventTree.C readEventTree("lcioEventTree.root") |
Further Information
Should you want to dive deeper into analysis, investigate the LCIO C++ API
Overview
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