C++ TIterator类代码示例

///
/// Converts a RooDataSet to a TTree which then can be
/// browsed.
///
TTree* Utils::convertRooDatasetToTTree(RooDataSet *d)
{
	// set up the TTree based on the content of the first
	// row of the dataset
	map<string,float> variables;  ///< the proxy variables
	TTree* t = new TTree("tree", "tree");
	TIterator* it = d->get(0)->createIterator();
	while ( RooRealVar* p = (RooRealVar*)it->Next() ){
		variables.insert(pair<string,float>(p->GetName(),p->getVal()));
		t->Branch(p->GetName(), &variables[p->GetName()], TString(p->GetName())+"/F");
	}
	delete it;

	// loop over the dataset, filling the tree
	int nEntries = d->sumEntries();
	for ( int i=0; i<nEntries; i++ ){
		it = d->get(i)->createIterator();
		while ( RooRealVar* p = (RooRealVar*)it->Next() ){
			variables[p->GetName()] = p->getVal();
		}
		delete it;
		t->Fill();
	}

	return t;
}

void scaleToRate(const char* collectionName, double rateFactor) {
  TRegexp reg(collectionName, kTRUE);
  
  //    gDirectory->ls();
  TList* list = gDirectory->GetList() ;
  TIterator* iter = list->MakeIterator();
  TObject* obj = 0;
  
  while (obj = iter->Next()) {
    if (! obj->InheritsFrom(TH1::Class())) {
      //      cout << "bugger" << endl;
      continue;
    }
    
    
    TString name = obj->GetName();
    cout << "Testing name: " << name << " against " << collectionName << endl;
    
    if (TString(collectionName).MaybeRegexp()) {
      cout << "we have a possible match" << endl;
      cout << "Trying to match to " << TString(obj->GetName()) << endl;
      if (TString(obj->GetName()).Index(reg) < 0 ) {
	cout << "failure here.  Argument returns " << TString(obj->GetName()).Index(reg) << endl;
	continue;
      }
    }
    else if (! name.BeginsWith(collectionName)) continue;
    
    cout << "We're trying to scale" << name << endl;
    ((TH1*)obj)->Scale(rateFactor);
    
  }
  
}

QString Include::GetFile()
{
	if(Root.IsNull())
	{
		throw NoLabelInicialisationException("Include: label do not inicialised.");
	}

	if(Root.IsNull())
	{
		throw NoLabelInicialisationException("Include: label do not inicialised.");
	}

	TIterator TITER;

	TITER.Init(Root, false);
	while (TITER.More())
	{
		TElement val = TITER.Value();
		QString name = val.GetName();
		if(name == "File name")
		{
			TString valint = (TString)val;
			return valint.GetValue();
		}
		TITER.Next();
	}

	return "";
}

af::TList Scheme::GetIncludeList()
{
	if(Root.IsNull())
	{
		throw NoLabelInicialisationException("Scheme: label do not inicialised.");
	}
	
	
//	return IncludeList;
	
	
	TIterator TITER;

	TList valls;
	TITER.Init(Root, false);
	while (TITER.More())
	{
		TList val = (TList)TITER.Value();
		QString name = val.GetName();

		if(name == "IncludeList")
		{
			return val;
		}
		TITER.Next();
	}

	TElement e(Root);
	throw NoExistException("Scheme: Include List do not exists.", e);

	return valls;
}

   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
         }
      }
   }

///
/// Merge two named sets of variables inside a RooWorkspace.
/// Duplicate variables will only be contained once.
///
void Utils::mergeNamedSets(RooWorkspace *w, TString mergedSet, TString set1, TString set2)
{
	// 1. fill all variables into a vector
	vector<string> varsAll;
	TIterator* it = w->set(set1)->createIterator();
	while ( RooRealVar* p = (RooRealVar*)it->Next() ) varsAll.push_back(p->GetName());
	delete it;
	it = w->set(set2)->createIterator();
	while ( RooRealVar* p = (RooRealVar*)it->Next() ) varsAll.push_back(p->GetName());
	delete it;

	// 2. remove duplicates
	sort(varsAll.begin(), varsAll.end());
	vector<string> vars;
	vars.push_back(varsAll[0]);
	string previous = varsAll[0];
	for ( int i=1; i<varsAll.size(); i++ ){
		if ( previous==varsAll[i] ) continue;
		vars.push_back(varsAll[i]);
		previous=varsAll[i];
	}

	// 3. make new, combined set on the workspace
	TString varsCommaList = "";
	for ( int i=0; i<vars.size(); i++ ){
		varsCommaList.Append(vars[i]);
		if ( i<vars.size()-1 ) varsCommaList.Append(",");
	}
	w->defineSet(mergedSet, varsCommaList);
}

///
/// Float each parameter in the named set "parname" inside workspace "w".
///
void Utils::floatParameters(RooWorkspace* w, TString parname)
{
	TIterator* it = w->set(parname)->createIterator();
	while ( RooRealVar* p = (RooRealVar*)it->Next() ){
		p->setConstant(false);
	}
}

/**
 * @brief Write all TObjects from a given TCollection into a certain directory structure in the file
 *
 * @param col pointer to a TCollection-based container
 * @param dirname name of a directory inside the output file to which the objects should be written
 * @param subdirname optional name of a subdirectory inside dirname to which the objects should be written
 *
 * This method whites all TObject-based objects contained in the TCollection-based container (see ROOT documentation)
 * into a directory whose name is given by dirname inside the output file. If dirname does not exist
 * in the output file, it will be created. Otherwise, contents of the col collection will be appended to an existing
 * directory.
 *
 * If the optional subdirectory name is specified (subdirname parameter, defaults to empty string) then the
 * contents of the collection will be written to "dirname/subdirname". If the "subdirname" directory does not
 * exist inside the "dirname" directory, it will be created.
 *
 */
void JPetWriter::writeCollection(const TCollection* col, const char* dirname, const char* subdirname)
{

  TDirectory* current =  fFile->GetDirectory(dirname);

  if (!current) {
    current = fFile->mkdir(dirname);
  }

  assert(current);

  // use a subdirectory if requested by user
  if (!std::string(subdirname).empty()) {

    if (current->GetDirectory(subdirname)) {
      current = current->GetDirectory(subdirname);
    } else {
      current = current->mkdir(subdirname);
    }
  }

  assert(current);

  current->cd();

  TIterator* it = col->MakeIterator();

  TObject* obj;
  while ((obj = it->Next())) {
    obj->Write();
  }

  fFile->cd();
}

   TLegend* legend(THStack* stack, Option_t* option = "lp", Bool_t addColor = kFALSE, Int_t token = -1,
                   Float_t xmin = 0.50, Float_t ymin = 0.51, Float_t xmax = 0.85, Float_t ymax = 0.92) {
      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->GetTitle(), 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;
   }

af::Model OutValue::GetModelOfValue()
{
	if(Root.IsNull())
	{
		throw NoLabelInicialisationException("OutValue: label do not inicialised.");
	}

	TIterator TITER;

	Model vallr;
	TITER.Init(Root, false);
	while (TITER.More())
	{
		Model val = (Model)TITER.Value();
		QString name = val.GetName();

		if(name == "Model")
		{
			return val;
		}
		TITER.Next();
	}

	TElement e(Root);
	throw NoExistException("OutValue: Model Of Value do not exists.", e);

	return vallr;
}

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

  // 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;
}

///
/// load Parameter limits
/// by default the "free" limit is loaded, can be changed to "phys" by command line argument
///
void MethodDatasetsProbScan::loadParameterLimits() {
    TString rangeName = arg->enforcePhysRange ? "phys" : "free";
    if ( arg->debug ) cout << "DEBUG in Combiner::loadParameterLimits() : loading parameter ranges: " << rangeName << endl;
    TIterator* it = w->set(pdf->getParName())->createIterator();
    while ( RooRealVar* p = (RooRealVar*)it->Next() ) setLimit(w, p->GetName(), rangeName);
    delete it;
}

RooFitResult *breakDownFit(RooSimultaneous *m, RooAbsData *d, RooRealVar *mass, bool precondition = false){
	if(precondition){
		 const char *catsName = m->indexCat().GetName();
		 TIterator *it = m->indexCat().typeIterator();
		 while(RooCatType* ci = dynamic_cast<RooCatType*>(it->Next())) {
			 const Text_t *catLabel = ci->GetName();
			 RooAbsPdf *pdf = m->getPdf(Form("%s",catLabel));
			 RooAbsData *reduced = d->reduce(SelectVars(*mass),Cut(Form("%s==%s::%s",catsName, catsName, catLabel)));
			 RooFitResult *r = pdf->fitTo(*reduced,PrintLevel(-1),Save(),
					 Minimizer("Minuit2","migrad"),Strategy(0),Hesse(false),Minos(false),Optimize(false)
					 );
			 cout << catsName << " " << catLabel << " M2migrad0 " << r->status() << endl;
			 if(r->status()!=0){
				 RooFitResult *r = pdf->fitTo(*reduced, PrintLevel(-1), Save());
				 cout << catsName << " " << catLabel << " Mmigrad1 " << r->status() << endl;
			 }
		 }
	}

	RooFitResult *r = m->fitTo(*d, Save(), PrintLevel(-1),
			Strategy(0));
	cout << "Global fit Mmigrad0 " << r->status() << endl;
	if(r->status()!=0){
	 RooFitResult *r = m->fitTo(*d, PrintLevel(-1), Save(),
			 Minimizer("Minuit","minimize"),Strategy(2));
	 cout << "Global fit Mminimize2 " << r->status() << endl;
	 return r;
	}

	return r;
}

   void colors(TCanvas* canvas, Color_t color = 1) {
      if(! canvas) return 0;

      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 == 40)
            colorIt = 1;
         else 
            ++colorIt;
      }
   }

   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);
         }
      }
   }