FGolf/tcmet/histtools.C

#include "TList.h"
#include "TObjArray.h"
#include "TH1.h"
#include "TH2.h"
#include "TLegend.h"
#include "THStack.h"
#include "TCanvas.h"
#include "TFile.h"
#include "TRegexp.h"
#include "TKey.h"
#include "TROOT.h"
#include <iostream>
#include "histtools.h"
#include <vector>
namespace hist {

  /*
  void plotHistos(vector<TH1F*> h, vector<char*> c,
                  char* title,char* xtitle, float min,
                  bool drawLeg, bool log, bool norm){

    if(log){
      gPad->SetLogy(1);
      if(min == 0.) cout<<"ERROR LOG PLOT WITH MIN SET TO ZERO"<<endl;
    }

    int nh = (int)h.size();
    if(nh.size()!=c.size()) cout<<"ERROR HIST SIZE NOT EQUAL TO CHAR SIZE"<<endl;

    int colors[]={1,2,4,5,6,7,8};
    
    for(int i=0;i<nh;i++){
      h.at(i)->SetFillColor(0);
      h.at(i)->SetLineWidth(2);
      h.at(i)->SetLineColor(colors[i]);
      h.at(i)->SetMarkerColor(colors[i]);
      
      if(norm){
        if(h.at(i)->GetEntries() > 0) h.at(i)->Scale(1./h.at(i)->GetEntries());
      }
    }
    h.at(0)->SetTitle(title);
    h.at(0)->GetXaxis()->SetTitle(xtitle);
    h.at(0)->Draw();
    float max=h.at(0)->GetMaximum();

    for(int i=1;i<nh;i++){
      h.at(i)->Draw();
      if(h.at(i)->GetMaximum() > max) max=h.at(i)->GetMaximum();
    }
    
    if(log) h.at(0)->SetMaximum(1.5*max);
    else    h.at(0)->SetMaximum(1.1*max);
    h.at(0)->SetMinimum(min);
    
    if(drawLeg){
      TLegend *leg=new TLegend(0.6,0.6,0.85,0.85);
      for(int i=0;i<nh;i++) leg->AddEntry(h.at(i),c.at(i));
      leg->SetFillColor(0);
      leg->SetBorderSize(1);
      leg->Draw();
    }
    
  }
  */
 
  void plotHistos(TH1F* h1, TH1F* h2,TH1F* h3,
                  char* c1, char* c2, char* c3,
                  char* title,char* xtitle, float min,
                  bool drawLeg, bool log, bool norm){

    if(log){
      gPad->SetLogy(1);
      if(min == 0.) cout<<"ERROR LOG PLOT WITH MIN SET TO ZERO"<<endl;
    }

    h1->SetFillColor(0);
    h2->SetFillColor(0);
    h3->SetFillColor(0);
    h1->SetLineWidth(2);
    h2->SetLineWidth(2);
    h3->SetLineWidth(2);
    h1->SetLineColor(1);
    h2->SetLineColor(2);
    h3->SetLineColor(4);
    h2->SetMarkerColor(2);
    h3->SetMarkerColor(4);
    h1->SetTitle(title);
    h1->GetXaxis()->SetTitle(xtitle);
    
    if(norm){
      if(h1->GetEntries() > 0) h1->Scale(1./h1->GetEntries());
      if(h2->GetEntries() > 0) h2->Scale(1./h2->GetEntries());
      if(h3->GetEntries() > 0) h3->Scale(1./h3->GetEntries());
    }

    h1->Draw();
    h2->Draw("same");
    h3->Draw("same");
    
    float max=h1->GetMaximum();
    if(h2->GetMaximum()>max) max=h2->GetMaximum();
    if(h3->GetMaximum()>max) max=h3->GetMaximum();
    
    if(log) h1->SetMaximum(1.5*max);
    else    h1->SetMaximum(1.1*max);
    h1->SetMinimum(min);
    
    if(drawLeg){
      TLegend *leg=new TLegend(0.6,0.6,0.85,0.85);
      leg->AddEntry(h1,c1);
      leg->AddEntry(h2,c2);
      leg->AddEntry(h3,c3);
      leg->SetFillColor(0);
      leg->SetBorderSize(1);
      leg->Draw();
    }
    
  }


  TGraphErrors *getTGraphFromTH2(TH2* h,vector<float> xbins, int method){
    
    const int nbins = (int)xbins.size()-1;
    TH2* htemp[nbins];
    TH1* hx[nbins];
    TH1* hy[nbins];
    
    float x[nbins];
    float y[nbins];
    float xerr[nbins];
    float yerr[nbins];

    for(int ibin=0;ibin<nbins;ibin++){
      
      htemp[ibin] = hist::suppressHist(h,ibin,xbins.at(ibin),xbins.at(ibin+1));
      float width = xbins.at(ibin+1) - xbins.at(ibin);
      hx[ibin]    = htemp[ibin]->ProjectionX();
      hy[ibin]    = htemp[ibin]->ProjectionY();

      x[ibin]     = hx[ibin]->GetMean(1);
      xerr[ibin]  = width/2.;
     
      if(method == 0){
        y[ibin]     = hy[ibin]->GetMean(1);
        yerr[ibin]  = (hy[ibin]->GetEntries()>0) ? 
          hy[ibin]->GetRMS(1)/sqrt(hy[ibin]->GetEntries()) : 0.;
      }
      if(method == 1){
        y[ibin]     = hy[ibin]->GetRMS(1);
        yerr[ibin]  = 0.;
      }

    }

    TGraphErrors *g=new TGraphErrors(nbins,x,y,xerr,yerr);
    g->GetXaxis()->SetLimits(xbins.at(0),xbins.at(nbins));
    
    return g;
  }
  
  TH2* suppressHist(TH2* hist,int iclone,float xmin,float xmax){
    
    TH2F* h=new TH2F(Form("%s_%s%i",hist->GetName(),"clone",iclone),hist->GetTitle(),
                     hist->GetNbinsX(),hist->GetXaxis()->GetXmin(),hist->GetXaxis()->GetXmax(),
                     hist->GetNbinsY(),hist->GetYaxis()->GetXmin(),hist->GetYaxis()->GetXmax());
    
    for(int ibinx=1;ibinx<=hist->GetNbinsX();ibinx++){
      for(int ibiny=1;ibiny<=hist->GetNbinsY();ibiny++){
        if(hist->GetBinCenter(ibinx)>xmin && hist->GetBinCenter(ibinx)<xmax){
          h->SetBinContent(ibinx,ibiny,hist->GetBinContent(ibinx,ibiny));
        }else{
          h->SetBinContent(ibinx,ibiny,0);
        }
      }
    }
    return h;
  }
  
  //Add all histograms whose names match one of ten possible regular expression
  //patterns or begin with one of ten possible given prefixes.  Feel free to
  //mix and match regular expression patterns and prefixes.  If the final hist-
  //ogram named outHistName does not exist it is created.
  
  void add(const char* outHistName, const char* patORpfx0, const char* patORpfx1, const char* patORpfx2, const char* patORpfx3, const char* patORpfx4, const char* patORpfx5, const char* patORpfx6, const char* patORpfx7, const char* patORpfx8, const char* patORpfx9)
  {
    add(outHistName, patORpfx0);
    add(outHistName, patORpfx1);
    if (patORpfx2) add(outHistName, patORpfx2);
    if (patORpfx3) add(outHistName, patORpfx3);
    if (patORpfx4) add(outHistName, patORpfx4);
    if (patORpfx5) add(outHistName, patORpfx5);
    if (patORpfx6) add(outHistName, patORpfx6);
    if (patORpfx7) add(outHistName, patORpfx7);
    if (patORpfx8) add(outHistName, patORpfx8);
    if (patORpfx9) add(outHistName, patORpfx9);
  }

  //Add all histograms whose names match the given regular expression pattern
  //or begin with the given prefix.  If the final histogram named outHistName
  //does not exist it is created.

  void add(const char* outHistName, const char* patORpfx) {
    TRegexp reg(patORpfx, kFALSE);

    TList* list = gDirectory->GetList() ;
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;
    TObject* hist = 0;
    Bool_t makeOutHist = false;

    hist = gDirectory->Get(outHistName);
    //If out hist does not exist, remember to create it
    if (! hist) makeOutHist = true;

    cout << "Adding to " << outHistName << endl;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;
      TString name = obj->GetName();

      //Don't add out hist
      if (name == TString(outHistName)) continue;

      if (TString(patORpfx).MaybeRegexp()) {
        if (TString(obj->GetName()).Index(reg) < 0 ) continue;
      } else if (! name.BeginsWith(patORpfx)) continue;

      if (makeOutHist) {
        hist = obj->Clone(outHistName);

        if (hist->InheritsFrom(TH2::Class()))
          ((TH2*)hist)->Reset();
        else
          ((TH1*)hist)->Reset();

        ((TH1*)hist)->SetTitle(outHistName);
        ((TH1*)hist)->Sumw2();
        makeOutHist = false;
      }

      cout << "Adding " << name << endl;
      ((TH1*)hist)->Add((TH1*)obj);
    }
  }

  //For all histograms whose names match the given regular expression pattern
  //or begin with the given prefix, set the fill, line and marker colors to the
  //given value.
   
  void color(const char* patORpfx, Color_t color) {
    TRegexp reg(patORpfx, kFALSE);

    TList* list = gDirectory->GetList() ;
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      TString name = obj->GetName();

      if (TString(patORpfx).MaybeRegexp()) {
        if (TString(obj->GetName()).Index(reg) < 0 ) continue;
      } else if (! name.BeginsWith(patORpfx)) continue;

      ((TH1*)obj)->SetFillColor(color);
      ((TH1*)obj)->SetLineColor(color);
      ((TH1*)obj)->SetMarkerColor(color);
    }
  }

  void invertx(const char* patORpfx) {
    TRegexp reg(patORpfx, kFALSE);

    TList* list = gDirectory->GetList() ;
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;
    TH1* h = 0;
    TH1* htemp = 0;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      TString name = obj->GetName();

      if (TString(patORpfx).MaybeRegexp()) {
        if (TString(obj->GetName()).Index(reg) < 0 ) continue;
      } else if (! name.BeginsWith(patORpfx)) continue;

      cout << "Inverting " << name.Data() << endl;

      h = (TH1*)obj;
      htemp = (TH1*)h->Clone("htemp");

      unsigned int nbinsp2 = h->GetNbinsX()+2;
      for(unsigned int i = 0; i < nbinsp2; i++) {
        h->SetBinContent(i, htemp->GetBinContent(nbinsp2-1-i));
        h->SetBinError(i, htemp->GetBinError(nbinsp2-1-i));
      }
    }

    delete htemp;
  }

  //For all histograms drawn on a given TCanvas, set the fill, line and marker
  //colors in ascending order starting from the given color.

  void colors(TCanvas* canvas, Color_t color) {
    if(! canvas) return;

    TList* list = canvas->GetListOfPrimitives();
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;

    //Hist color iterator
    Int_t colorIt = color;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      //yellow
      if (colorIt == 5)
        ++colorIt;

      hist::color(obj->GetName(), colorIt);
      if (colorIt == 7)
        colorIt = 1;
      else 
        ++colorIt;
    }
  }

  //For all histograms added to a given THStack, set the fill, line and marker
  //colors in ascending order starting from the given color.

  void colors(THStack* stack, Color_t color) {
    if(! stack) return;

    TList* list = stack->GetHists();
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;

    //Hist color iterator
    Int_t colorIt = color;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      hist::color(obj->GetName(), colorIt);
      if (colorIt == 7)
        colorIt = 1;
      else 
        ++colorIt;
    }
  }

  //Create a canvas and Draw("same") all histograms whose names match the given
  //regular expression pattern or begin with the given prefix.  If the TCanvas
  //named canvasName does not exist it is created.  Optionally apply colors and
  //styles to all histograms.

  void drawsame(const char* canvasName, const char* patORpfx, Bool_t addColor, Bool_t addStyle, Option_t* drawOption) {
    TRegexp reg(patORpfx, kFALSE);

    TList* list = gDirectory->GetList() ;
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;
    TObject* canvas = 0;
    Bool_t makeCanvas = false;

    canvas = gROOT->GetListOfCanvases()->FindObject(canvasName);
    //If canvas does not exist, remember to create it
    if (! canvas) makeCanvas = true;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      TString name = obj->GetName();

      if (TString(patORpfx).MaybeRegexp()) {
        if (TString(obj->GetName()).Index(reg) < 0 ) continue;
      } else if (! name.BeginsWith(patORpfx)) continue;

      if (makeCanvas) {
        canvas = new TCanvas(canvasName, canvasName);
        makeCanvas = false;
      }

      ((TCanvas*)canvas)->cd();
      if (!((TCanvas*)canvas)->GetListOfPrimitives()->GetEntries())
        ((TH1*)obj)->Draw(Form("%s", drawOption));
      else
        ((TH1*)obj)->Draw(Form("SAME%s", drawOption));
    }

    if (addColor)
      hist::colors((TCanvas*)canvas);
    if (addStyle)
      hist::styles((TCanvas*)canvas);
  }

  //Return a pointer to a TLegend with an entry for each histogram drawn on a
  //given TCanvas.  Display either the line, point or fill values.  Optionally
  //apply colors to all histograms.  By default, entry labels are the names of
  //their respective histograms.  Optionally, if histogram names are of the
  //form XX_YY_ZZ_WW, entry labels can be XX (token=0), YY (token=1), etc.

  TLegend* legend(const char* canvasName, Option_t* option, Bool_t addColor, Int_t token, Float_t xmin, Float_t ymin, Float_t xmax, Float_t ymax) {
    if(! canvasName) return 0;

    TCanvas* canvas = 0;
    TObject* obj = 0;
    obj = gROOT->FindObjectAny(canvasName);

    if(obj && obj->InheritsFrom(TCanvas::Class()))
      canvas = (TCanvas*)obj;
    else
      return 0;

    TLegend* leg = new TLegend(xmin, ymin, xmax, ymax);
    TList* list = canvas->GetListOfPrimitives();
    TIterator* iter = list->MakeIterator();

    //Hist color iterator
    Int_t colorIt = 1;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      if (addColor) {
        hist::color(obj->GetName(), colorIt);
        ++colorIt;
      }

      if (token == -1)
        leg->AddEntry(obj, obj->GetName(), option);
      else {
        TString name(obj->GetName());
        TObjArray* a = name.Tokenize("_");
        if (a->GetEntries() <= token)
          leg->AddEntry(obj, obj->GetName(), option);
        else
          leg->AddEntry(obj, a->At(token)->GetName(), option);
      }
    }

    return leg;
  }

  //Return a pointer to a TLegend with an entry for each histogram drawn on a
  //given TCanvas.  Display either the line, point or fill values.  Optionally
  //apply colors to all histograms.  By default, entry labels are the names of
  //their respective histograms.  Optionally, if histogram names are of the
  //form XX_YY_ZZ_WW, entry labels can be XX (token=0), YY (token=1), etc.

  TLegend* legend(TCanvas* canvas, Option_t* option, Bool_t addColor, Int_t token, Float_t xmin, Float_t ymin, Float_t xmax, Float_t ymax) {
    if(! canvas) return 0;

    TLegend* leg = new TLegend(xmin, ymin, xmax, ymax);
    TList* list = canvas->GetListOfPrimitives();
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;

    //Hist color iterator
    Int_t colorIt = 1;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      if (addColor) {
        hist::color(obj->GetName(), colorIt);
        ++colorIt;
      }

      if (token == -1)
        leg->AddEntry(obj, obj->GetName(), option);
      else {
        TString name(obj->GetName());
        TObjArray* a = name.Tokenize("_");
        if (a->GetEntries() <= token)
          leg->AddEntry(obj, obj->GetName(), option);
        else
          leg->AddEntry(obj, a->At(token)->GetName(), option);
      }
    }

    return leg;
  }

  //Return a pointer to a TLegend with an entry for each histogram added to a
  //given THStack.  Display either the line, point or fill values.  Optionally
  //apply colors to all histograms.  By default, entry labels are the names of
  //their respective histograms.  Optionally, if histogram names are of the
  //form XX_YY_ZZ_WW, entry labels can be XX (token=0), YY (token=1), etc.

  TLegend* legend(THStack* stack, Option_t* option, Bool_t addColor, Int_t token, Float_t xmin, Float_t ymin, Float_t xmax, Float_t ymax) {
    if(! stack) return 0;

    TLegend* leg = new TLegend(xmin, ymin, xmax, ymax);
    TList* list = stack->GetHists();
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;

    //Hist color iterator
    Int_t colorIt = 1;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      if (addColor) {
        hist::color(obj->GetName(), colorIt);
        ++colorIt;
      }

      if (token == -1)
        leg->AddEntry(obj, obj->GetName(), option);
      else {
        TString name(obj->GetName());
        TObjArray* a = name.Tokenize("_");
        if (a->GetEntries() <= token)
          leg->AddEntry(obj, obj->GetName(), option);
        else
          leg->AddEntry(obj, a->At(token)->GetName(), option);
      }
    }

    return leg;
  }

  //Normalize to one all histograms whose names match the given regular exp-
  //ression pattern or begin with the given prefix.

  void normalize(const char* patORpfx) {
    TRegexp reg(patORpfx, kFALSE);

    TList* list = gDirectory->GetList() ;
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      TString name = obj->GetName();

      if (TString(patORpfx).MaybeRegexp()) {
        if (TString(obj->GetName()).Index(reg) < 0 ) continue;
      } else if (! name.BeginsWith(patORpfx)) continue;

      Double_t integral = 0;

      if (obj->InheritsFrom(TH2::Class()))
        integral = ((TH2*)obj)->Integral();
      else
        integral = ((TH1*)obj)->Integral();

      if (integral) {
        ((TH1*)obj)->Sumw2();
        ((TH1*)obj)->Scale(1./integral);
      }
    }
  }

  //Scale by the given value all histograms whose names match the given regular
  //expression pattern or begin with the given prefix.

  void scale(const char* patORpfx, Double_t scale) {
    TRegexp reg(patORpfx, kFALSE);

    TList* list = gDirectory->GetList() ;
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      TString name = obj->GetName();

      if (TString(patORpfx).MaybeRegexp()) {
        if (TString(obj->GetName()).Index(reg) < 0 ) continue;
      } else if (! name.BeginsWith(patORpfx)) continue;

      ((TH1*)obj)->Sumw2();
      ((TH1*)obj)->Scale(scale);
    }
  }

  //Scale bins to given value of x-axis units for all histograms whose names
  //match the given regular expression pattern or begin with the given prefix.

  void scalebins(const char* patORpfx, Double_t scale) {
    TRegexp reg(patORpfx, kFALSE);

    TList* list = gDirectory->GetList() ;
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      TString name = obj->GetName();

      if (TString(patORpfx).MaybeRegexp()) {
        if (TString(obj->GetName()).Index(reg) < 0 ) continue;
      } else if (! name.BeginsWith(patORpfx)) continue;

      Double_t binWidth, binContent, binError, newBinContent, newBinError;
      for (Int_t i = 1; i <= ((TH1*)obj)->GetNbinsX(); ++i) {
        binWidth = ((TH1*)obj)->GetBinWidth(i);
        binContent = ((TH1*)obj)->GetBinContent(i);
        binError = ((TH1*)obj)->GetBinError(i);
        newBinContent = (binContent*scale)/binWidth;
        newBinError = (binError*scale)/binWidth;

        ((TH1*)obj)->SetBinContent(i, newBinContent);
        ((TH1*)obj)->SetBinError(i, newBinContent);
        // Rename y axis with scale
      }
    }
  }

  //Don't you hate it when you draw multiple histograms on the same canvas only
  //to find that the bottom histogram's range does not encompass those of the
  //histograms drawn on top?  This method determines the maximum and minimum y
  //range of all the histograms drawn on a given TCanvas and appropriately re-
  //sizes the bottom histogram.

  void setrangey(const char* canvasName, Double_t maxy, Double_t miny) {
    if(! canvasName) return;

    TCanvas* canvas = 0;
    TObject* obj = 0;
    obj = gROOT->FindObjectAny(canvasName);

    if(obj && obj->InheritsFrom(TCanvas::Class()))
      canvas = (TCanvas*)obj;
    else
      return;

    TList* list = canvas->GetListOfPrimitives();
    TIterator* iter = list->MakeIterator();

    TObject* top = 0;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      if (! top) top = obj;

      if (((TH1*)obj)->GetMaximum() > maxy) maxy = ((TH1*)obj)->GetMaximum();

      // JAKE Set to log scale if max/min > 10

      if (canvas->GetLogy()) {
        //protect against user supplied argument
        if (miny == 0) miny = 999999;

        for(Int_t bin = 1; bin <= ((TH1*)obj)->GetNbinsX(); ++bin) {
          Double_t binContent = ((TH1*)obj)->GetBinContent(bin);
          if (binContent != 0 && binContent < miny)
            miny = binContent;
        }
      } else if (((TH1*)obj)->GetMinimum() < miny) miny = ((TH1*)obj)->GetMinimum();
    }

    ((TH1*)top)->SetMaximum(maxy*1.1);
    ((TH1*)top)->SetMinimum(miny*0.9);
  }

  //Create a stacked histogram consisting of all histograms whose names match
  //the given regular expression pattern or begin with the given prefix.  If
  //the THStack named stackHistName does not exist it is created.  Optionally
  //apply colors to all histograms.  Set drawOption to "nostack" if you do not
  //want to stack, to "hist" to display histograms without errors, to "histe"
  //to display histograms with errors, etc.

  //Don't you hate it when you draw multiple histograms on the same canvas only
  //to find that the bottom histogram's range does not encompass those of the
  //histograms drawn on top?  This method determines the maximum and minimum y
  //range of all the histograms drawn on a given TCanvas and appropriately re-
  //sizes the bottom histogram.

  void setrangey(TCanvas* canvas, Double_t maxy, Double_t miny) {
    if(! canvas) return;

    TList* list = canvas->GetListOfPrimitives();
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;
    TObject* top = 0;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      if (! top) top = obj;

      if (((TH1*)obj)->GetMaximum() > maxy) maxy = ((TH1*)obj)->GetMaximum();

      // JAKE Set to log scale if max/min > 10

      if (canvas->GetLogy()) {
        //protect against user supplied argument
        if (miny == 0) miny = 999999;

        for(Int_t bin = 1; bin <= ((TH1*)obj)->GetNbinsX(); ++bin) {
          Double_t binContent = ((TH1*)obj)->GetBinContent(bin);
          if (binContent != 0 && binContent < miny)
            miny = binContent;
        }
      } else if (((TH1*)obj)->GetMinimum() < miny) miny = ((TH1*)obj)->GetMinimum();
    }

    ((TH1*)top)->SetMaximum(maxy*1.1);
    ((TH1*)top)->SetMinimum(miny*0.9);
  }

  //Create a stacked histogram consisting of all histograms whose names match
  //the given regular expression pattern or begin with the given prefix.  If
  //the THStack named stackHistName does not exist it is created.  Optionally
  //apply colors to all histograms.  Set drawOption to "nostack" if you do not
  //want to stack, to "hist" to display histograms without errors, to "histe"
  //to display histograms with errors, etc.

  void stack(const char* stackHistName, const char* patORpfx, Bool_t addColor, Option_t* drawOption) {
    TRegexp reg(patORpfx, kFALSE);

    TList* list = gDirectory->GetList() ;
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;
    TObject* stack = 0;
    Bool_t makeStackHist = false;

    stack = gDirectory->Get(stackHistName);
    //If stack hist does not exist, remember to create it
    if (! stack) makeStackHist = true;

    //Hist color iterator
    Int_t colorIt = 1;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      TString name = obj->GetName();

      if (TString(patORpfx).MaybeRegexp()) {
        if (TString(obj->GetName()).Index(reg) < 0 ) continue;
      } else if (! name.BeginsWith(patORpfx)) continue;

      if (makeStackHist) {
        stack = new THStack(stackHistName, stackHistName);
        makeStackHist = false;
      }

      if (addColor) {
        hist::color(obj->GetName(), colorIt);
        ++colorIt;
      }

      ((THStack*)stack)->Add((TH1*)obj, drawOption);
    }

    // Currently breaks .ls
    //gDirectory->Append(stack);
  }

  //For all histograms whose names match the given regular expression pattern
  //or begin with the given prefix, set the marker style.
   
  void style(const char* patORpfx, Style_t style) {
    TRegexp reg(patORpfx, kFALSE);

    TList* list = gDirectory->GetList() ;
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      TString name = obj->GetName();

      if (TString(patORpfx).MaybeRegexp()) {
        if (TString(obj->GetName()).Index(reg) < 0 ) continue;
      } else if (! name.BeginsWith(patORpfx)) continue;

      ((TH1*)obj)->SetMarkerStyle(style);
    }
  }

  //For all histograms drawn on a given TCanvas, set the marker styles in
  //ascending order starting from the given style.

  void styles(TCanvas* canvas, Style_t style) {
    if(! canvas) return;

    TList* list = canvas->GetListOfPrimitives();
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;

    //Hist style iterator
    Int_t styleIt = style;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      ((TH1*)obj)->SetMarkerStyle(styleIt);
      ++styleIt;
    }
  }

  //For all histograms drawn on a given THStack, set the marker styles in
  //ascending order starting from the given style.

  void styles(THStack* stack, Style_t style) {
    if(! stack) return;

    TList* list = stack->GetHists();
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;

    //Hist style iterator
    Int_t styleIt = style;

    while (obj = iter->Next()) {
      if (! obj->InheritsFrom(TH1::Class())) continue;

      ((TH1*)obj)->SetMarkerStyle(styleIt);
      ++styleIt;
    }
  }

  //Set the x-axis title of all histograms whose names match the given regular
  //expression pattern or begin with the given prefix.

  void xaxis(const char* patORpfx, const char* title) {
    TRegexp reg(patORpfx, kFALSE);

    TList* list = gDirectory->GetList() ;
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;

    while (obj = iter->Next()) {
      if (! (obj->InheritsFrom(TH1::Class()) || obj->InheritsFrom(THStack::Class()))) continue;

      TString name = obj->GetName();

      if (TString(patORpfx).MaybeRegexp()) {
        if (TString(obj->GetName()).Index(reg) < 0 ) continue;
      } else if (! name.BeginsWith(patORpfx)) continue;

      if (obj->InheritsFrom(TH1::Class()))
        ((TH1*)obj)->GetXaxis()->SetTitle(title);
      if (obj->InheritsFrom(THStack::Class())) {
        ((THStack*)obj)->Draw();
        ((THStack*)obj)->GetXaxis()->SetTitle(title);
      }
    }
  }

  //Set the y-axis title of all histograms whose names match the given regular
  //expression pattern or begin with the given prefix.

  void yaxis(const char* patORpfx, const char* title) {
    TRegexp reg(patORpfx, kFALSE);

    TList* list = gDirectory->GetList() ;
    TIterator* iter = list->MakeIterator();

    TObject* obj = 0;

    while (obj = iter->Next()) {
      if (! (obj->InheritsFrom(TH1::Class()) || obj->InheritsFrom(THStack::Class()))) continue;

      TString name = obj->GetName();

      if (TString(patORpfx).MaybeRegexp()) {
        if (TString(obj->GetName()).Index(reg) < 0 ) continue;
      } else if (! name.BeginsWith(patORpfx)) continue;

      if (obj->InheritsFrom(TH1::Class()))
        ((TH1*)obj)->GetYaxis()->SetTitle(title);
      if (obj->InheritsFrom(THStack::Class())) {
        ((THStack*)obj)->Draw();
        ((THStack*)obj)->GetYaxis()->SetTitle(title);
      }
    }
  }
}

// Input:  2 histogram
// Output: one histogram which is the efficiency:
// h1 :  TOTAL NUMBER OF EVENTS
// h2 :  NUMBER OF EVENTS THAT PASS

#include "TH1.h"

// Method by pointer
TH1F* eff(TH1F* h1, TH1F* h2, const char* name){

  // first, verify that all histograms have same binning
  // nx is the number of visible bins
  // nxtot = nx+2 includes underflow and overflow
  Int_t nx = h1->GetNbinsX();
  if (h2->GetNbinsX() != nx) {
    cout << "Histograms must have same number of bins" << endl;
    return 0;
  }

  // get the new histogram
  TH1F* temp = (TH1F*) h1->Clone(name);
  temp->SetTitle(name);
  temp->Reset();
  temp->Sumw2();

  // Do the calculation
  temp->Divide(h2,h1,1.,1.,"B");

  // Done
  return temp;
}


// Method by name
TH1F* eff(const char* name1, const char* name2, const char* name){

  // Get a list of object and their iterator
  TList* list = gDirectory->GetList() ;
  TIterator* iter = list->MakeIterator();

  // Loop over objects, set the pointers
  TObject* obj;
  TH1F* h1=0;
  TH1F* h2=0;
  TString str1 = Form("%s",name1);
  TString str2 = Form("%s",name2);
  while(obj=iter->Next()) {
    TString objName = obj->GetName();
    if (objName == str1) h1 = (TH1F*) obj;
    if (objName == str2) h2 = (TH1F*) obj;
  }

  // quit if not found
  if (h1 == 0) {
    cout << "Histogram " << name1 << " not found" << endl;
    return 0;
  }
  if (h2 == 0) {
    cout << "Histogram " << name2 << " not found" << endl;
    return 0;
  }

  // Call the method by pointer
  TH1F* temp = eff(h1, h2, name);
  return temp;
}
// Input:  4 histogram
// Output: one histogram which is the BG subtracted efficiency:
// h1 :  TOTAL NUMBER OF EVENTS, SIGNAL REGION
// h2 :  NUMBER OF EVENTS THAT PASS, SIGNAL REGION
// h3 :  TOTAL NUMBER OF EVENTS, SIDE BAND
// h4 :  NUMBER OF EVENTS THAT PASS, SIDE BAND

#include "TH1.h"


TH1F* eff_bg(TH1F* h1, TH1F* h2, TH1F* h3, TH1F* h4, const char* name){

  // first, verify that all histograms have same binning
  // nx is the number of visible bins
  // nxtot = nx+2 includes underflow and overflow
  Int_t nx = h1->GetNbinsX();
  Int_t nxtot = nx + 2;
  if (h2->GetNbinsX() != nx) {
    cout << "Histograms must have same number of bins" << endl;
    return 0;
  }
  if (h3->GetNbinsX() != nx) {
    cout << "Histograms must have same number of bins" << endl;
    return 0;
  }
  if (h3->GetNbinsX() != nx) {
    cout << "Histograms must have same number of bins" << endl;
    return 0;
  }

  // get the new histogram
  TH1F* temp = (TH1F*) h1->Clone(name);
  temp->SetTitle(name);
  temp->Reset();
  temp->Sumw2();

  // Loop over bins, calculate efficiency and error, put it in histogram
  for (Int_t i=0; i<nxtot; i++) {
    Double_t x1 = h1->GetBinContent(i);
    Double_t x2 = h2->GetBinContent(i);
    Double_t x3 = h3->GetBinContent(i);
    Double_t x4 = h4->GetBinContent(i);
    Double_t denom = x1 - x3;
    Double_t eff;
    if (denom == 0.) {
      eff = 0;
    } else {
      eff   = (x2-x4)/denom;
    }
    Double_t failSig = x1 - x2;
    Double_t failBg  = x3 - x4;
    Double_t blah    = (1-eff)*(1-eff)*(x2+x4) + eff*eff*(failSig+failBg);
    if (blah <= 0.) blah=0.0;
    Double_t err;
    if (denom == 0) {
      err = 0.;
    } else {
      err = sqrt(blah)/denom;
    }
    temp->SetBinContent(i,eff);
    temp->SetBinError(i,err);
  }

  // Done
  return temp;
}

#include <TList.h>
#include <TIterator.h>

void deleteHistos() {
  // Delete all existing histograms in memory
  TObject* obj;
  TList* list = gDirectory->GetList() ;
  TIterator* iter = list->MakeIterator();
  while (obj=iter->Next()) {
    if (obj->IsA()->InheritsFrom(TH1::Class()) ||
        obj->IsA()->InheritsFrom(TH2::Class()) ) {delete obj;}
  }
}

void saveHist(const char* filename, const char* pat)
{
  TList* list = gDirectory->GetList() ;
  TIterator* iter = list->MakeIterator();

  TRegexp re(pat,kTRUE) ;
  TObject *obj;

  TFile outf(filename,"RECREATE") ;
  while(obj=iter->Next()) {
    if (TString(obj->GetName()).Index(re)>=0) {
      obj->Write() ;
      cout << "." ;
      cout.flush() ;
    }
  }
  cout << endl ;
  outf.Close() ;

  delete iter ;
}


void loadHist(const char* filename, const char* directory, const char* pfx, const char* pat, Bool_t doAdd)
{
  TFile inf(filename) ;
  //inf.ReadAll() ;
  TDirectory* dir;
  if (directory)
    dir = (TDirectory*)inf.Get(directory);
  else
    dir = &inf;
  TList* list = dir->GetListOfKeys() ;
  TIterator* iter = list->MakeIterator();

  TRegexp re(pat,kTRUE) ;
  cout << "pat = " << pat << endl ;

  gDirectory->cd("Rint:") ;

  TObject* obj ;
  TKey* key ;
  cout << "doAdd = " << (doAdd?"T":"F") << endl ;
  cout << "loadHist: reading." ;
  while(key=(TKey*)iter->Next()) {

    Int_t ridx = TString(key->GetName()).Index(re) ;
    if (ridx==-1) {
      continue ;
    }

    obj = dir->Get(key->GetName()) ;
    TObject* clone ;
    if (pfx) {

      // Find existing TH1-derived objects
      TObject* oldObj = 0 ;
      if (doAdd){
        oldObj = gDirectory->Get(Form("%s_%s",pfx,obj->GetName())) ;
        if (oldObj && !oldObj->IsA()->InheritsFrom(TH1::Class())) {
          oldObj = 0 ;
        }
      }
      if (oldObj) {
        clone = oldObj ;
        ((TH1*)clone)->Add((TH1*)obj) ;
      } else {
        clone = obj->Clone(Form("%s_%s",pfx,obj->GetName())) ;
      }


    } else {

      // Find existing TH1-derived objects
      TObject* oldObj = 0 ;
      if (doAdd){
        oldObj = gDirectory->Get(key->GetName()) ;
        if (oldObj && !oldObj->IsA()->InheritsFrom(TH1::Class())) {
          oldObj = 0 ;
        }
      }

      if (oldObj) {
        clone = oldObj ;
        ((TH1*)clone)->Add((TH1*)obj) ;
      } else {
        clone = obj->Clone() ;
      }
    }
    if (!gDirectory->GetList()->FindObject(clone)) {
      gDirectory->Append(clone) ;
    }
    cout << "." ;
    cout.flush() ;
  }
  cout << endl;
  inf.Close() ;
  delete iter ;
}
Revision:	1.2
Committed:	Tue Jan 26 06:46:07 2010 UTC (15 years, 3 months ago) by benhoob
Content type:	text/plain
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.1:	+808 -644 lines
Log Message:	Added function to get TGraph from TH2