sept 11, 2003root day1, suzanne panacek39 root an object oriented hep analysis framework. day 1

Sept 11, 2003ROOT Day1, Suzanne

Panacek 39

ROOTAn object oriented HEP

analysis framework.

Day 1


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The ROOT Team


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ROOT contacts at Fermi

Philippe Canal , [email protected]

Suzanne Panacek, [email protected]

1. Jeff Kallenbach, x22101. [email protected]


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Mailing Lists the ROOT mailing list:[email protected] archives:http://root.cern.ch/root/roottalk/

AboutRootTalk.html Fermilab mailing list:[email protected] archives:http://listserv.fnal.gov/archives/about-root.html


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Class Schedule - Day 1 Overview of the ROOT Framework GUI basics Command line basics Finding Information (class

reference guide)

Getting started with the exercises


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Class Schedule - Day 2 Root Commands and CINT Discuss Exercises Functions and Fitting The Tree Viewer


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Class Schedule - Day 3 Building ROOT Trees Reading Trees Using Trees in Analysis

TTree->Draw TTree->MakeClass Chains

Exercise discussion How to add your Own Class

With the Interpreter With the compiler (shared library) With ACLiC


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ROOT Overview What about PAW Concepts: Object Oriented Design,

Frameworks Services and Utilities Libraries Physical Organization


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Differences from PAW Regular grammar (C++) on command line Single language (compiled and

interpreted) Object Oriented (use your class in the

interpreter) Advanced Interactive User Interface Well Documented code. HTML class

descriptions for every class. Object I/O including Schema Evolution 3-d interfaces with OpenGL and X3D.


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PAW to ROOT File Conversion Get the example PAW file from

http://www-pat.fnal.gov/root/examples/toyz.rz

At the system prompt type

> h2root toyz.rz toyz.root

Once you've done the conversion, you can then start

a ROOT session and open toyz.root

Also see: http://root.cern.ch/root/HowtoConvert.html


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Object Oriented Concepts

Members: a “has a” relationship to the class.

Inheritance: an “is a” relationship to the class.

Class: the description of a “thing” in the system Object: instance of a class Methods: functions for a class

Event

TrackSegment Vertex

Momentum MassSquare InterceptAtVert

HAS AHAS AHAS A

HAS A HAS AHAS A

TObject

IS A


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A Frameworkprovides utilities and services.


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ROOT's Services/Utilities Histogramming and Fitting Graphics (2D, 3D) I/O to file or socket: specialized for

histograms, Ntuples (Trees) Collection Classes and Run Time Type

Identification User Interface

GUI: Browsers, Panels, Tree Viewer Command Line interface: C++ interpreter CINT Script Processor (C++ compiled C++

interpreted)


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The Libraries

Over 350 classes

Core CINT Libraries loaded at

startup: Hist, Tree … Libraries loaded when

needed: HistPainter, TreePlayer,…

Special purpose libraries: EG, Physics…


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The Framework Organization

*.h...

cintmakecintnewproofdproofservrmkdependrootroot.exerootcintroot-configrootd

bin

$ROOTSYS

libCint.solibCore.solibEG.so*libEGPythia.so*libEGPythia6.solibEGVenus.solibGpad.solibGraf.solibGraf3d.solibGui.solibGX11.so*libGX11TTF.solibHist.solibHistPainter.solibHtml.solibMatrix.solibMinuit.solibNew.solibPhysics.solibPostscript.solibProof.so*libRFIO.so*libRGL.solibRint.so*libThread.solibTree.solibTreePlayer.solibTreeViewer.so*libttf.solibX3d.solibXpm.a

Aclock.cxxAclock.hEvent.cxxEvent.hEventLinkDef.hHello.cxxHello.hMainEvent.cxxMakefileMakefile.inMakefile.win32READMETestVectors.cxxTetris.cxxTetris.heventa.cxxeventb.cxxeventload.cxxguitest.cxxhsimple.cxxhworld.cxxminexam.cxxstress.cxxtcollbm.cxxtcollex.cxxtest2html.cxxtstring.cxxvlazy.cxxvmatrix.cxxvvector.cxx

lib testtutorials include

* OptionalInstallation

EditorBar.CIfit.Canalyze.Carchi.Carrow.Cbasic.Cbasic.datbasic3d.Cbenchmarks.Ccanvas.Cclasscat.Ccleanup.Ccompile.Ccopytree.Ccopytree2.Cdemos.Cdemoshelp.Cdialogs.Cdirs.Cellipse.Ceval.Cevent.Cexec1.Cexec2.Cfeynman.Cfildir.Cfile.Cfillrandom.Cfirst.Cfit1.Cfit1_C.C

fitslicesy.Cformula1.Cframework.Cgames.Cgaxis.Cgeometry.Cgerrors.Cgerrors2.Cgraph.Ch1draw.Chadd.Chclient.Chcons.Chprod.Chserv.Chserv2.Chsimple.Chsum.ChsumTimer.Chtmlex.Cio.Clatex.Clatex2.Clatex3.Cmanyaxis.Cmultifit.Cmyfit.Cna49.Cna49geomfile.Cna49view.Cna49visible.C

ntuple1.Coldbenchmarks.Cpdg.datpsexam.Cpstable.Crootalias.Crootenv.Crootlogoff.Crootlogon.Crootmarks.Cruncatalog.sqlrunzdemo.Csecond.Cshapes.Cshared.Csplines.Csqlcreatedb.Csqlfilldb.Csqlselect.Cstaff.Cstaff.datsurfaces.Ctcl.Ctestrandom.Ctornado.Ctree.Ctwo.Cxyslider.CxysliderAction.Czdemo.C


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Three User Interfaces GUI

windows, buttons, menus

Root Command lineCINT (C++ interpreter)

Macros, applications, libraries (C++ compiler and interpreter)


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ROOT Overview Summary PAW Concepts: Object Oriented Design,

Frameworks Services and Utilities Libraries Physical Organization


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GUI Basics Browsing and opening files Drawing histograms Right click, left click, middle click Draw Panel Fit Panel Adding Color and Zooming Adding text and other objects Dividing the canvas Setting the log scale


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GUI Basics

Display the browser1. TBrowser b;

Start root> root

Quit root (just in case) root[0]>.q


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Displaying a Histogram

Display a histogram The Canvas

Open the root fileBrowse the file


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Basic Navigation by Clicking

Left Click select the object drag the object resize the object

Right Click context menu class::name methods

Middle Click activate canvas freezes event status

bar


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The Draw Panel The Event Status

The Draw PanelAdding Error barsSliderDefaults


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Fitting, Coloring, and Zooming

Adding a gaussian fit Coloring the histogram Zooming/unzooming


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Adding Objects to the Canvas

The Editor Adding an Arrow Adding Text


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Adding another Pad Add a Pad Select the new

Pad Draw a histogram Add a title for the

axis


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Modifying the Statistics

The Canvas in the Browser

Setting the (7) statistics options default = 0001111


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Dividing the Canvas

Create a new Canvas Divide it in 2 Draw two histograms.

1. Lego plot2. LogY


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Command Line Basics

Use up and down arrows to recall commands $HOME/.root_hist

Use emacs commands to navigate


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Open a File Open a file for reading

root [] TFile f("Example.root") Look at the contents of the file

root [] f.ls()TFile** Example.root ROOT file TFile* Example.root ROOT file KEY: TTree myTree;1 Example ROOT tree KEY: TH1F totalHistogram;1 Total Distribution KEY: TH1F mainHistogram;1 Main Contributor KEY: TH1F s1Histogram;1 First Signal KEY: TH1F s2Histogram;1 Second Signal


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Plotting a Variable Plot a variable

root [] myTree->Draw("xs1")

Where did myTree come from? ROOT executed an implicit gROOT->FindObject("myTree")

And now.. root[] f.ls() … OBJ: TTree myTree Example ROOT tree: 0 KEY: TTree myTree;1 Example ROOT tree


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The ROOT File

A TFile is a directory structure like UNIX Object in Memory (OBJ) Object on Disk (KEY)


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The ROOT Tree

Stores large quantities of same class objects: Optimize disk space Optimize access speed Had analysis methods (TTree::Draw)

TNtuple is a TTree limited to floating point numbers.

More details later …


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Fitting

To add a Gaussian Fitroot [] htemp->Fit("gaus")

Where did htemp come from?automatically generated

histogram by the TTree::Draw command.


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Color and Error Bars To add color

root [] htemp->SetFillColor(9) See pg. 134 of the Users Guide for color

index Or on any Canvas choose View:Colors

Drawing Error Barsroot[] htemp->Draw("E1,same")

Many Draw Options See the User's Guide


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Command Line Basics Open and browse a file Drawing histograms Adding a Fit Adding Error bars Adding Color


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Where to Find Information The ROOT Home: http://root.cern.ch

Talks and publications on ROOT: http://root.cern.ch/root/Publications.html

To get information on a specific class : http://root.cern.ch/root/html/ClassIndex.html


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Class Reference Guide Find the class in the index, for

example TH1. Class Inheritanceclass TH1 : public TNamed, public TAttLine, public

TAttFill, public TAttMarker

Class Description Private members Public methods Code

TH1

TH3 TH2

TH1C TH1S TH1F TH1D

TProfile

TH2C TH2S TH2F TH2DTH3S TH3F

TProfile2D

TH3C TH3D


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Finding Examples The ROOT Tutorials:

http://root.cern.ch/root/Tutorials.html

The ROOT How To's:

http://root.cern.ch/root/Howto.html

For on-line help for a particular topic it's very

useful to use their facility to search the

ROOT site. http://root.cern.ch/root


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More Information

To subscribe to roottalk: http://root.cern.ch/root/roottalk/AboutRootTalk.html

To submit a bug report:

http://pcroot.cern.ch/root-bugs

About ROOT at Fermi: [email protected]

http://ods.fnal.gov/ods/root-eval/current/

To subscribe to the about-root mailing list send

mail to [email protected] with the body of the

email: subscribe about-root

email@addresses.


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Summary Overview of ROOT GUI Basics Command line basics Using the Class reference

guide PAW to ROOT conversion


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Getting started with the Exercises

Go to: http://patwww.fnal.gov/root/class/Setup.htm for setup instructions using Reflection and ssh on fcdfsgi2 and d0mino and minos1.

Find the exercises on line at:http://patwww.fnal.gov/root/class/exercises.htm

sept 11, 2003root day1, suzanne panacek39 root an object oriented hep analysis framework. day 1

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