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Reference Guide
jets.C File Reference
#include "TRandom.h"
#include <ROOT/REveElement.hxx>
#include <ROOT/REveScene.hxx>
#include <ROOT/REveManager.hxx>
#include <ROOT/REveJetCone.hxx>
Include dependency graph for jets.C:


void jets ()
void makeJets (int N_Jets, REX::REveElement *jetHolder)


const Double_t kR_max = 250
const Double_t kR_min = 240
const Double_t kZ_d = 300

Detailed Description

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#include "TFile.h"
#include "TTree.h"
#include "TRandom.h"
#include "TROOT.h"
#include "TSystem.h"
#include "JetEvent.h"
#include "Riostream.h"
void write(Int_t nev=100) {
//write nev Jet events
TFile f("JetEvent.root","recreate");
TTree *T = new TTree("T","Event example with Jets");
JetEvent *event = new JetEvent;
for (Int_t ev=0;ev<nev;ev++) {
void read() {
//read the JetEvent file
TFile f("JetEvent.root");
TTree *T = (TTree*)f.Get("T");
JetEvent *event = 0;
T->SetBranchAddress("event", &event);
Long64_t nentries = T->GetEntries();
for (Long64_t ev=0;ev<nentries;ev++) {
if (ev) continue; //dump first event only
cout << " Event: "<< ev
<< " Jets: " << event->GetNjet()
<< " Tracks: " << event->GetNtrack()
<< " Hits A: " << event->GetNhitA()
<< " Hits B: " << event->GetNhitB() << endl;
void pileup(Int_t nev=200) {
//make nev pileup events, each build with LOOPMAX events selected
//randomly among the nentries
TFile f("JetEvent.root");
TTree *T = (TTree*)f.Get("T");
// Long64_t nentries = T->GetEntries();
const Int_t LOOPMAX=10;
JetEvent *events[LOOPMAX];
Int_t loop;
for (loop=0;loop<LOOPMAX;loop++) events[loop] = 0;
for (Long64_t ev=0;ev<nev;ev++) {
if (ev%10 == 0) printf("building pileup: %lld\n",ev);
for (loop=0;loop<LOOPMAX;loop++) {
Int_t rev = gRandom->Uniform(LOOPMAX);
T->SetBranchAddress("event", &events[loop]);
void jets(Int_t nev=100, Int_t npileup=200, Bool_t secondrun = true) {
// Embedding these loads inside the first run of the script is not yet
// supported in v6
// gROOT->ProcessLine(".L $ROOTSYS/tutorials/tree/JetEvent.cxx+");
//void jets(Int_t nev=100, Int_t npileup=200, Bool_t secondrun);
void jets(Int_t nev=100, Int_t npileup=200) {
TString tutdir = gROOT->GetTutorialDir();
gROOT->ProcessLine(".L " + tutdir + "/tree/JetEvent.cxx+");
gROOT->ProcessLine("#define JETS_SECOND_RUN yes");
gROOT->ProcessLine("#include \"" __FILE__ "\"");
#define f(i)
Definition: RSha256.hxx:104
int Int_t
Definition: RtypesCore.h:41
bool Bool_t
Definition: RtypesCore.h:59
long long Long64_t
Definition: RtypesCore.h:69
int nentries
Definition: THbookFile.cxx:89
#define gROOT
Definition: TROOT.h:415
R__EXTERN TRandom * gRandom
Definition: TRandom.h:62
A ROOT file is a suite of consecutive data records (TKey instances) with a well defined format.
Definition: TFile.h:48
virtual Double_t Uniform(Double_t x1=1)
Returns a uniform deviate on the interval (0, x1).
Definition: TRandom.cxx:635
Basic string class.
Definition: TString.h:131
A TTree represents a columnar dataset.
Definition: TTree.h:72
void jets()
Definition: jets.C:38
double T(double x)
Definition: ChebyshevPol.h:34

Definition in file jets.C.

Function Documentation

◆ jets()

void jets ( )

Definition at line 38 of file jets.C.

◆ makeJets()

void makeJets ( int  N_Jets,
REX::REveElement jetHolder 

Definition at line 21 of file jets.C.

Variable Documentation

◆ kR_max

const Double_t kR_max = 250

Definition at line 18 of file jets.C.

◆ kR_min

const Double_t kR_min = 240

Definition at line 17 of file jets.C.

◆ kZ_d

const Double_t kZ_d = 300

Definition at line 19 of file jets.C.