all the histograms are globally defined.

gain_measurement.cpp

@@ -4,9 +4,18 @@ 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};
 
@@ -20,9 +29,9 @@ double fitmax[namplitudes]={1700.,1420.,1240.};
 
 
 /////////////////////////////////////////////////////////////
- // The function fit_1d sets the cosmetics for the histograms/
- // and fits the histogram with modified erf function.       /
- /////////////////////////////////////////////////////////////
+// The function fit_1d sets the cosmetics for the histograms/
+// and fits the histogram with modified erf function.       /
+/////////////////////////////////////////////////////////////
 
 //TH1D *fit_1d(TH1D *hist_255, int i,int j, double low_limit, double up_limit)
 
@@ -70,18 +79,6 @@ TH1D *fit_1d(TH1D *hist_255[namplitudes],int colors[namplitudes],int markers[nam
 
 void gain_measurement()
 {
-  //Initialising the histograms.
-
- 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);
-
- cout<<"THe histograms initialised..."<<std::endl;
-  
-  /*TH1D *hist_255_amp03 = new TH1D("hist_255_amp03"," Threshold gain measurement",500,850,1750);
-  TH1D *hist_255_amp02 = new TH1D("hist_255_amp02"," Threshold gain measurement",500,850,1750);
-  TH1D *hist_255_amp01 = new TH1D("hist_255_amp01"," Threshold gain measurement",500,850,1750);*/
-
   //Initialising the trees.
 
   TTree *tree1 = new TTree("tree1", "tree1");
@@ -104,12 +101,9 @@ void gain_measurement()
     {
       fit_1d(&hist_255[iamp],&colors[iamp],&markers[iamp],iamp, &fitmin[iamp], &fitmax[iamp]);
 
-}
+    }
   cout<<"The fiiting function is called three times..."<<std::endl;
 
-  /* fit_1d(hist_255_amp03,1,3,1220.0,1700.0);
-  fit_1d(hist_255_amp02,2,2,1200.0,1420.0);
-  fit_1d(hist_255_amp01,3,1,1150.0,1240.0);*/
 
   //Drawing the legend
 
@@ -132,3 +126,12 @@ void gain_measurement()
 
 
 
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+