code with huge error list

gain_measurement.cpp

-//Global parameters defined
+/*defining global variables*/
 
-const int namplitudes = 3;
 int nbins = 450;
 double xmin=850.0,xmax = 1750.0;
 
 
-
-TH1D *hist_255[namplitudes];
-
-
-hist_255[0] = new TH1D("hist_255_amp03","Threshold gain measurement",nbins, xmin, xmax);
-hist_255[1] = new TH1D("hist_255_amp02","Threshold gain measurement",nbins, xmin, xmax);
-hist_255[2] = new TH1D("hist_255_amp01","Threshold gain measurement",nbins, xmin, xmax);
-
-
-
-
-int colors[namplitudes]={kAzure,kRed,kViolet};
-int markers[namplitudes]={2, 3, 5};
-
-double fitmin[namplitudes]={1220.,1200.,1150.};
-double fitmax[namplitudes]={1700.,1420.,1240.};
-
-
-
-
+std::vector<TH1D*>hist_255;
+std::vector<int>colors={kAzure,kRed,kViolet};
+std::vector<int>markers={2,3,5};
+std::vector<double>fitmin={1220.,1200.,1150.};
+std::vector<double>fitmax={1700.,1420.,1240.};
 
 
 
@@ -33,105 +17,84 @@ double fitmax[namplitudes]={1700.,1420.,1240.};
 // and fits the histogram with modified erf function.       /
 /////////////////////////////////////////////////////////////
 
-//TH1D *fit_1d(TH1D *hist_255, int i,int j, double low_limit, double up_limit)
-
-TH1D *fit_1d(TH1D *hist_255[namplitudes],int colors[namplitudes],int markers[namplitudes],int amp, double fitmin[namplitudes],double fitmax[namplitudes])
+TH1D *fit_1d(TH1D* &hist_255.at(amp),int &colors.at(amp),int &markers.at(amp),int amplitude,double &fitmin.at(amp),double &fitmax.at(amp))
 {
+  hist_255.at(amp)->GetXaxis()->SetTitle("Threshold");
+  hist_255.at(amp)->GetYaxis()->SetTitle("# sugnals above the threshold");
+  hist_255.at(amp)->SetMarkerColor(colors.at(amp));
+  hist_255.at(amp)->SetMarkerStyle(markers.at(amp));
 
-  hist_255[namplitudes]->GetXaxis()->SetTitle("Threshold");
-  hist_255[namplitudes]->GetYaxis()->SetTitle("#signals above the threshold");
-  hist_255[namplitudes]->SetMarkerColor(namplitudes);
-  hist_255[namplitudes]->SetMarkerStyle(namplitudes);
 
-  // hist_255->SetMarkerStyle(i+1);
-  // hist_255->SetMarkerColor(i+2);
+  TF1 *fitfunc = new TF1("fitfunc","([0]/2)*(1-TMath::Erf((x-[1])/(sqrt(2)*[2])))",fitmin.at(amp),fitmax.at(amp));
 
-  TF1 *fitfunc = new TF1("fitfunc","([0]/2)*(1-TMath::Erf((x-[1])/(sqrt(2)*[2])))",fitmin[namplitudes], fitmax[namplitudes]);
+  cout<<"The fit parameters for the amplitude amp_0"<<amplitude<<""<<" are as follows :"<<std::endl;
 
-  cout<<"The fit parameters for the amplitude amp_0"<<amp<<""<<" are as follows :"<<std::endl;
+  /*Setting parameter names*/
   fitfunc->SetParNames("constant","mean","noise");
 
+
   //Assigning Initial values to the parameters
 
   fitfunc->SetParameter(0,200.0);
 
-  int lastbin1 = hist_255[namplitudes]->FindLastBinAbove(200);
-  double mean = hist_255[namplitudes]->GetBinCenter(lastbin1);
-  cout<<"The initial mean value assigned for the data of amp_0 "<<amp<<""<<" is "<<""<<mean<<std::endl;
+  int lastbin1 = hist_255.at(amp)->FindLastBinAbove(200);
+  double mean = hist_255.at(amp)->GetBinCenter(lastbin1);
+  cout<<"The initial mean value assigned for the data of amp_0 "<<amplitude<<""<<" is "<<""<<mean<<std::endl;
   fitfunc->SetParameter(1,mean);
 
-  int lastbin2 = hist_255[namplitudes]->FindLastBinAbove(150);
-  int lastbin3 = hist_255[namplitudes]->FindLastBinAbove(50);
+  int lastbin2 = hist_255.at(amp)->FindLastBinAbove(150);
+  int lastbin3 = hist_255.at(amp)->FindLastBinAbove(50);
   int sigma = lastbin3 -lastbin2;
-  cout<<"The initial noise assigned for the data of amp_0 "<<amp<<""<<" is "<<""<<sigma<<std::endl;
+  cout<<"The initial noise assigned for the data of amp_0 "<<amplitude<<""<<" is "<<""<<sigma<<std::endl;
   fitfunc->SetParameter(2,sigma);
 
   fitfunc->SetLineWidth(2);
   fitfunc->SetLineColor(2);
 
-  hist_255[namplitudes]->Fit("fitfunc"," R");
-  hist_255[namplitudes]->GetListOfFunctions()->FindObject("fitfunc")->Draw("same");
+  hist_255.at(amp)->Fit("fitfunc"," R");
+  hist_255.at(amp)->GetListOfFunctions()->FindObject("fitfunc")->Draw("same");
 
-  hist_255[namplitudes]->SetStats(0);
-  return hist_255[namplitudes];
+  hist_255.at(amp)->SetStats(0);
+  return hist_255.at(amp);
 
 }
 
-void gain_measurement()
-{
-  //Initialising the trees.
 
+
+void gain_6()
+{
   TTree *tree1 = new TTree("tree1", "tree1");
   TTree *tree2 = new TTree("tree2", "tree2");
   TTree *tree3 = new TTree("tree3", "tree3");
-  cout<<"The trees are initialised..."<<std::endl;
+  cout<<"The trees are created..."<<std::endl;
 
+  /*Reading data from the files are storing into trees*/
 
   tree1->ReadFile("amp03_255_255.dat", "x/D:y/D");
   tree2->ReadFile("amp02_255_255.dat", "x/D:y/D");
   tree3->ReadFile("amp01_255_255.dat", "x/D:y/D");
   cout<<"The data is stored into the trees from the file..."<<std::endl;
 
-  tree1->Draw("x>>hist_255[0]","y","HIST P ");
-  tree2->Draw("x>>hist_255[1]","y","HIST SAME P ");
-  tree3->Draw("x>>hist_255[2]","y","HIST SAME P ");
+  TH1D *hist1 = hist_255.at(0);
+  TH1D *hist2 = hist_255.at(1);
+  TH1D *hist3 = hist_255.at(2);
+
+  tree1->Draw("x>>hist1","y","HIST P ");
+  tree2->Draw("x>>hist2","y","HIST SAME P ");
+  tree3->Draw("x>>hist3","y","HIST SAME P ");
   cout<<"The histograms are plotted.."<<std::endl;
 
-  for (int iamp=0; iamp<3;iamp++)
-    {
-      fit_1d(&hist_255[iamp],&colors[iamp],&markers[iamp],iamp, &fitmin[iamp], &fitmax[iamp]);
+  hist_255.push_back(hist1);
+  hist_255.push_back(hist2);
+  hist_255.push_back(hist3);
 
+  for(int iamp=0;iamp<3;iamp++)
+    {
+      fit_1d(hist_255.at(iamp),colors.at(iamp),markers.at(iamp),fitmin.at(iamp),fitmax.at(iamp));
     }
-  cout<<"The fiiting function is called three times..."<<std::endl;
-
-
-  //Drawing the legend
-
-  TLegend *leg = new TLegend(0.7,0.7,0.9,0.9);
-  leg->AddEntry(hist_255[0], "high amplitude","p");
-  leg->AddEntry(hist_255[1],"mid amplitude","p");
-  leg->AddEntry(hist_255[2],"low amplitude","p");
-  leg->Draw();
-
-  cout<<"The legend is drawn.."<<std::endl;
-
-  cout<<"Done...";
+  cout<<"Done..."<<std::endl;
 
 }
 
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