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ntuple1.C File Reference

Detailed Description

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Simple tree analysis.

#include "TCanvas.h"
#include "TFile.h"
#include "TNtuple.h"
#include "TProfile.h"
#include "TBenchmark.h"
#include "TStyle.h"
#include "TPaveText.h"
#include "TFrame.h"
#include "TF1.h"
#include "TROOT.h"
#include "TSystem.h"
#include "TInterpreter.h"
void ntuple1() {
//just in case this script is executed multiple times
delete gROOT->GetListOfFiles()->FindObject("hsimple.root");
delete gROOT->GetListOfCanvases()->FindObject("c1");
gBenchmark->Start("ntuple1");
//
// Connect ROOT histogram/ntuple demonstration file
// generated by example $ROOTSYS/tutorials/hsimple.C.
TString dir = gROOT->GetTutorialDir();
dir.Append("/hsimple.C");
dir.ReplaceAll("/./","/");
if (gBenchmark->GetBench("hsimple") < 0) gInterpreter->LoadMacro(dir.Data());
TFile *f1 = (TFile*)gROOT->ProcessLineFast("hsimple(1)");
if (!f1) return;
//
// Create a canvas, with 4 pads
//
TCanvas *c1 = new TCanvas("c1","The Ntuple canvas",200,10,700,780);
TPad *pad1 = new TPad("pad1","This is pad1",0.02,0.52,0.48,0.98,21);
TPad *pad2 = new TPad("pad2","This is pad2",0.52,0.52,0.98,0.98,21);
TPad *pad3 = new TPad("pad3","This is pad3",0.02,0.02,0.48,0.48,21);
TPad *pad4 = new TPad("pad4","This is pad4",0.52,0.02,0.98,0.48,1);
pad1->Draw();
pad2->Draw();
pad3->Draw();
pad4->Draw();
//
// Change default style for the statistics box
gStyle->SetStatW(0.30);
gStyle->SetStatH(0.20);
//
// Display a function of one ntuple column imposing a condition
// on another column.
pad1->cd();
pad1->SetGrid();
pad1->SetLogy();
TNtuple *ntuple = (TNtuple*)f1->Get("ntuple");
ntuple->SetLineColor(1);
ntuple->SetFillStyle(1001);
ntuple->SetFillColor(45);
ntuple->Draw("3*px+2","px**2+py**2>1");
ntuple->SetFillColor(38);
ntuple->Draw("2*px+2","pz>2","same");
ntuple->SetFillColor(5);
ntuple->Draw("1.3*px+2","(px^2+py^2>4) && py>0","same");
pad1->RedrawAxis();
//
// Display the profile of two columns
// The profile histogram produced is saved in the current directory with
// the name hprofs
pad2->cd();
pad2->SetGrid();
ntuple->Draw("pz:px>>hprofs","","goffprofs");
TProfile *hprofs = (TProfile*)gDirectory->Get("hprofs");
hprofs->SetMarkerColor(5);
hprofs->SetMarkerSize(0.7);
hprofs->SetMarkerStyle(21);
hprofs->Fit("pol2");
// Get pointer to fitted function and modify its attributes
TF1 *fpol2 = hprofs->GetFunction("pol2");
fpol2->SetLineWidth(4);
fpol2->SetLineColor(2);
//
// Display a scatter plot of two columns with a selection.
// Superimpose the result of another cut with a different marker color
pad3->cd();
pad3->GetFrame()->SetBorderSize(8);
ntuple->SetMarkerColor(1);
ntuple->Draw("py:px","pz>1");
ntuple->SetMarkerColor(2);
ntuple->Draw("py:px","pz<1","same");
//
// Display a 3-D scatter plot of 3 columns. Superimpose a different selection.
pad4->cd();
ntuple->Draw("pz:py:px","(pz<10 && pz>6)+(pz<4 && pz>3)");
ntuple->SetMarkerColor(4);
ntuple->Draw("pz:py:px","pz<6 && pz>4","same");
ntuple->SetMarkerColor(5);
ntuple->Draw("pz:py:px","pz<4 && pz>3","same");
TPaveText *l4 = new TPaveText(-0.9,0.5,0.9,0.95);
l4->SetFillColor(42);
l4->SetTextAlign(12);
l4->AddText("You can interactively rotate this view in 2 ways:");
l4->AddText(" - With the RotateCube in clicking in this pad");
l4->AddText(" - Selecting View with x3d in the View menu");
l4->Draw();
//
c1->cd();
c1->Update();
gBenchmark->Show("ntuple1");
}
R__EXTERN TBenchmark * gBenchmark
Definition TBenchmark.h:59
#define gDirectory
Definition TDirectory.h:384
#define gInterpreter
#define gROOT
Definition TROOT.h:406
R__EXTERN TStyle * gStyle
Definition TStyle.h:433
virtual void SetFillColor(Color_t fcolor)
Set the fill area color.
Definition TAttFill.h:37
virtual void SetFillStyle(Style_t fstyle)
Set the fill area style.
Definition TAttFill.h:39
virtual void SetLineWidth(Width_t lwidth)
Set the line width.
Definition TAttLine.h:43
virtual void SetLineColor(Color_t lcolor)
Set the line color.
Definition TAttLine.h:40
virtual void SetMarkerColor(Color_t mcolor=1)
Set the marker color.
Definition TAttMarker.h:38
virtual void SetMarkerStyle(Style_t mstyle=1)
Set the marker style.
Definition TAttMarker.h:40
virtual void SetMarkerSize(Size_t msize=1)
Set the marker size.
Definition TAttMarker.h:45
virtual void SetTextAlign(Short_t align=11)
Set the text alignment.
Definition TAttText.h:42
Int_t GetBench(const char *name) const
Returns index of Benchmark name.
virtual void Start(const char *name)
Starts Benchmark with the specified name.
virtual void Show(const char *name)
Stops Benchmark name and Prints results.
The Canvas class.
Definition TCanvas.h:23
1-Dim function class
Definition TF1.h:233
A ROOT file is composed of a header, followed by consecutive data records (TKey instances) with a wel...
Definition TFile.h:53
virtual TFitResultPtr Fit(const char *formula, Option_t *option="", Option_t *goption="", Double_t xmin=0, Double_t xmax=0)
Fit histogram with function fname.
Definition TH1.cxx:3894
virtual TF1 * GetFunction(const char *name) const
Return pointer to function with name.
Definition TH1.cxx:9015
A simple TTree restricted to a list of float variables only.
Definition TNtuple.h:28
The most important graphics class in the ROOT system.
Definition TPad.h:28
void SetGrid(Int_t valuex=1, Int_t valuey=1) override
Definition TPad.h:332
void SetLogy(Int_t value=1) override
Set Lin/Log scale for Y.
Definition TPad.cxx:5987
void RedrawAxis(Option_t *option="") override
Redraw the frame axis.
Definition TPad.cxx:5337
TVirtualPad * cd(Int_t subpadnumber=0) override
Set Current pad.
Definition TPad.cxx:597
TFrame * GetFrame() override
Get frame.
Definition TPad.cxx:2859
void Draw(Option_t *option="") override
Draw Pad in Current pad (re-parent pad if necessary).
Definition TPad.cxx:1268
A Pave (see TPave) with text, lines or/and boxes inside.
Definition TPaveText.h:21
virtual TText * AddText(Double_t x1, Double_t y1, const char *label)
Add a new Text line to this pavetext at given coordinates.
void Draw(Option_t *option="") override
Draw this pavetext with its current attributes.
Profile Histogram.
Definition TProfile.h:32
Basic string class.
Definition TString.h:139
const char * Data() const
Definition TString.h:376
TString & ReplaceAll(const TString &s1, const TString &s2)
Definition TString.h:704
TString & Append(const char *cs)
Definition TString.h:572
void SetStatH(Float_t h=0.1)
Definition TStyle.h:397
void SetStatColor(Color_t color=19)
Definition TStyle.h:387
void SetStatW(Float_t w=0.19)
Definition TStyle.h:396
void Draw(Option_t *opt) override
Default Draw method for all objects.
Definition TTree.h:431
virtual void SetBorderSize(Short_t bordersize)
Definition TWbox.h:52
return c1
Definition legend1.C:41
TF1 * f1
Definition legend1.C:11
Author
Rene Brun

Definition in file ntuple1.C.