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Revision c773da9f5b81c15a00fec29ca0499e58441671de authored by Rene Brun on 09 October 2006, 06:31:09 UTC, committed by Rene Brun on 09 October 2006, 06:31:09 UTC 
From Lorenzo:
 
ixes in GetStats() for taking into account underflow/overflow when TH1::StatOverflows is set and the modifications in TH2::ProjectionX and TH2::ProjectionY to use TH1::SetBinContent
instead of TH1::Fill in oder to have correct statistics in the projected histogram in case of weights. This fixes the bug 19628.
The number of entries in the projected histogram is set now to the number of effective entries.


git-svn-id: http://root.cern.ch/svn/root/trunk@16477 27541ba8-7e3a-0410-8455-c3a389f83636
1 parent 73d8d11
Raw File
hstack.C 
void hstack() {
// Example of stacked histograms: class THStack
//
//  Author: Rene Brun
   
   THStack *hs = new THStack("hs","test stacked histograms");
   //create three 1-d histograms
   TH1F *h1 = new TH1F("h1","test hstack",100,-4,4);
   h1->FillRandom("gaus",20000);
   h1->SetFillColor(kRed);
   h1->SetMarkerStyle(21);
   h1->SetMarkerColor(kRed);
   hs->Add(h1);
   TH1F *h2 = new TH1F("h2","test hstack",100,-4,4);
   h2->FillRandom("gaus",15000);
   h2->SetFillColor(kBlue);
   h2->SetMarkerStyle(21);
   h2->SetMarkerColor(kBlue);
   hs->Add(h2);
   TH1F *h3 = new TH1F("h3","test hstack",100,-4,4);
   h3->FillRandom("gaus",10000);
   h3->SetFillColor(kGreen);
   h3->SetMarkerStyle(21);
   h3->SetMarkerColor(kGreen);
   hs->Add(h3);
   
   TCanvas *c1 = new TCanvas("c1","stacked hists",10,10,1000,800);
   c1->SetFillColor(41);
   c1->Divide(2,2);
   // in top left pad, draw the stack with defaults
   c1->cd(1);
   hs->Draw();
   // in top right pad, draw the stack in non-stack mode and errors option
   c1->cd(2);
   gPad->SetGrid();
   hs->Draw("nostack,e1p");
   //in bottom left, draw in stack mode with "lego1" option
   c1->cd(3);
   gPad->SetFrameFillColor(17);
   gPad->SetTheta(3.77);
   gPad->SetPhi(2.9);
   hs->Draw("lego1");

   c1->cd(4);
   //create two 2-D histograms and draw them in stack mode
   gPad->SetFrameFillColor(17);
   THStack *a = new THStack("a","test legos");
   TF2 *f1 = new TF2("f1","xygaus + xygaus(5) + xylandau(10)",-4,4,-4,4);
   Double_t params[] = {130,-1.4,1.8,1.5,1, 150,2,0.5,-2,0.5, 3600,-2,0.7,-3,0.3};
   f1->SetParameters(params);
   TH2F *h2a = new TH2F("h2a","h2a",20,-4,4,20,-4,4);
   h2a->SetFillColor(38);
   h2a->FillRandom("f1",4000);
   TF2 *f2 = new TF2("f2","xygaus + xygaus(5)",-4,4,-4,4);
   Double_t params[] = {100,-1.4,1.9,1.1,2, 80,2,0.7,-2,0.5};
   f2->SetParameters(params);
   TH2F *h2b = new TH2F("h2b","h2b",20,-4,4,20,-4,4);
   h2b->SetFillColor(46);
   h2b->FillRandom("f2",3000);
   a->Add(h2a);
   a->Add(h2b);
   a->Draw();
}
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