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hstack.C File Reference

Detailed Description

View in nbviewer Open in SWAN Example of stacked histograms: class THStack.

TCanvas *hstack() {
THStack *hs = new THStack("hs","Stacked 1D histograms");
//create three 1-d histograms
TH1F *h1st = new TH1F("h1st","test hstack",100,-4,4);
h1st->FillRandom("gaus",20000);
h1st->SetMarkerStyle(21);
hs->Add(h1st);
TH1F *h2st = new TH1F("h2st","test hstack",100,-4,4);
h2st->FillRandom("gaus",15000);
h2st->SetMarkerStyle(21);
hs->Add(h2st);
TH1F *h3st = new TH1F("h3st","test hstack",100,-4,4);
h3st->FillRandom("gaus",10000);
h3st->SetMarkerStyle(21);
hs->Add(h3st);
TCanvas *cst = new TCanvas("cst","stacked hists",10,10,700,700);
cst->Divide(2,2);
// in top left pad, draw the stack with defaults
cst->cd(1);
hs->Draw();
// in top right pad, draw the stack in non-stack mode
// and errors option
cst->cd(2);
hs->Draw("nostack,e1p");
//in bottom left, draw in stack mode with "lego1" option
cst->cd(3);
gPad->SetTheta(3.77);
gPad->SetPhi(2.9);
hs->Draw("lego1");
cst->cd(4);
//create two 2-D histograms and draw them in stack mode
THStack *a = new THStack("a","Stacked 2D histograms");
TF2 *f1 = new TF2("f1",
"xygaus + xygaus(5) + xylandau(10)",-4,4,-4,4);
Double_t params1[] = {130,-1.4,1.8,1.5,1, 150,2,0.5,-2,0.5,
3600,-2,0.7,-3,0.3};
f1->SetParameters(params1);
TH2F *h2sta = new TH2F("h2sta","h2sta",20,-4,4,20,-4,4);
h2sta->SetFillColor(38);
h2sta->FillRandom("f1",4000);
TF2 *f2 = new TF2("f2","xygaus + xygaus(5)",-4,4,-4,4);
Double_t params2[] = {100,-1.4,1.9,1.1,2, 80,2,0.7,-2,0.5};
f2->SetParameters(params2);
TH2F *h2stb = new TH2F("h2stb","h2stb",20,-4,4,20,-4,4);
h2stb->SetFillColor(46);
h2stb->FillRandom("f2",3000);
a->Add(h2sta);
a->Add(h2stb);
a->Draw();
return cst;
}
#define a(i)
Definition RSha256.hxx:99
double Double_t
Definition RtypesCore.h:59
@ kRed
Definition Rtypes.h:66
@ kGreen
Definition Rtypes.h:66
@ kBlue
Definition Rtypes.h:66
#define gPad
virtual void SetFillColor(Color_t fcolor)
Set the fill area color.
Definition TAttFill.h:37
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
void SetFrameFillColor(Color_t color=1)
Definition TAttPad.h:73
The Canvas class.
Definition TCanvas.h:23
TVirtualPad * cd(Int_t subpadnumber=0) override
Set current canvas & pad.
Definition TCanvas.cxx:706
virtual void SetParameters(const Double_t *params)
Definition TF1.h:644
A 2-Dim function with parameters.
Definition TF2.h:29
1-D histogram with a float per channel (see TH1 documentation)}
Definition TH1.h:575
virtual void FillRandom(const char *fname, Int_t ntimes=5000, TRandom *rng=nullptr)
Fill histogram following distribution in function fname.
Definition TH1.cxx:3526
2-D histogram with a float per channel (see TH1 documentation)}
Definition TH2.h:251
virtual void FillRandom(const char *fname, Int_t ntimes=5000, TRandom *rng=nullptr)
Fill histogram following distribution in function fname.
Definition TH2.cxx:677
The Histogram stack class.
Definition THStack.h:38
virtual void Draw(Option_t *chopt="")
Draw this multihist with its current attributes.
Definition THStack.cxx:467
virtual void Add(TH1 *h, Option_t *option="")
add a new histogram to the list Only 1-d and 2-d histograms currently supported.
Definition THStack.cxx:381
void Divide(Int_t nx=1, Int_t ny=1, Float_t xmargin=0.01, Float_t ymargin=0.01, Int_t color=0) override
Automatic pad generation by division.
Definition TPad.cxx:1178
virtual void SetGrid(Int_t valuex=1, Int_t valuey=1)=0
TF1 * f1
Definition legend1.C:11
Author
Rene Brun

Definition in file hstack.C.