fix to prevent perprocessor crash when data is strange

diff --git a/T0/AliT0CalibWalk.cxx b/T0/AliT0CalibWalk.cxx
index 0d1a6566934f10c07e40a39623a1400a019a005b..fb1b3d7b96f89570e141f76092599b8d28974155 100644 (file)
--- a/T0/AliT0CalibWalk.cxx
+++ b/T0/AliT0CalibWalk.cxx
@@ -97,7 +97,7 @@ AliT0CalibWalk::~AliT0CalibWalk()
 Bool_t AliT0CalibWalk::MakeWalkCorrGraph(const char *laserFile)
 {
   //make walk corerction for preprocessor
-  Float_t sigma, xp, cfdmean, qtmean, ledmean;
+  Float_t sigma,cfdmean, qtmean, ledmean;
   Bool_t ok=true;
   Float_t   mips[50];
   
@@ -154,44 +154,43 @@ Bool_t AliT0CalibWalk::MakeWalkCorrGraph(const char *laserFile)
                AliWarning(Form(" no QTC correction data in LASER DA for channel %i for amplitude %f MIPs",i,mips[im]));
              if(!hLED)       
                AliWarning(Form(" no LED correction data in LASER DA for channel %i for amplitude %f MIPs",i,mips[im]));
+             if( hCFD && hCFD->GetEntries()<500 ) {
+               ok=false;
+               printf("no peak in CFD spectrum for PMT %i amplitude %i\n",i,im);
+               return ok;
+             }
              
-             if(hCFD && hCFD->GetEntries()>500) {
-               GetMeanAndSigma(hCFD, xp, sigma);
-               }                  
-             else 
-               {
+             if(hCFD && hCFD->GetEntries()>500 ) {
+               if( hCFD->GetRMS() >= 1.5) 
+                 GetMeanAndSigma(hCFD, cfdmean, sigma);
+               else
+                 cfdmean = hCFD->GetMean();
+               
+               if (im == 0) cfd0[i] = cfdmean;
+               y1[im] =  cfdmean - cfd0[i];
+             } 
+             if(hQTC && hQTC->GetEntries()>500) {
+               GetMeanAndSigma(hQTC, qtmean, sigma);
+               
+               x1[im] = qtmean;
+               if( x1[im] == 0) {
                  ok=false;
-                 printf("no peak in CFD spectrum for PMT %i amplitude %i\n",i,im);
+                 printf("no peak in QTC signal for PMT %i amplitude %i\n",i,im);
                  return ok;
                }
-
-             if (hCFD->GetRMS() < 1.5) cfdmean = hCFD->GetMean();
-             else cfdmean=xp;
-             if (im == 0) cfd0[i] = cfdmean;
-               y1[im] =  cfdmean - cfd0[i];
+             }
                
-               if(hQTC && hQTC->GetEntries()>500) {
-                 GetMeanAndSigma(hQTC, qtmean, sigma);
-                                  
-                 x1[im] = qtmean;
-                 if( x1[im] == 0) {
-                   ok=false;
-                   printf("no peak in QTC signal for PMT %i amplitude %i\n",i,im);
-                   return ok;
-                 }
+             if( hLED && hLED->GetEntries()>500) {
+               GetMeanAndSigma(hLED, ledmean, sigma);
+             }                            
+             else
+               { 
+                 ok=false;
+                 printf("no peak in LED spectrum for PMT %i amplitude %i\n",i,im);
+                 return ok;
                }
-               
-               if( hLED && hLED->GetEntries()>500) {
-                 GetMeanAndSigma(hLED, ledmean, sigma);
-               }                                  
-               else
-                 { 
-                   ok=false;
-                   printf("no peak in LED spectrum for PMT %i amplitude %i\n",i,im);
-                   return ok;
-                 }
-               x2[im] = ledmean;
-               xx2[im] = x2[nmips-im-1];
+             x2[im] = ledmean;
+             xx2[im] = x2[nmips-im-1];
                
                xx[im]=mips[im];
                if (hQTC) delete  hQTC;
@@ -209,26 +208,7 @@ Bool_t AliT0CalibWalk::MakeWalkCorrGraph(const char *laserFile)
          
          if(i==0) cout<<"Making graphs..."<<endl;
          
-         
-         /*
-         
-         
-         Float_t x1[50], y1[50]; 
-         Float_t x2[50], xx2[50],y2[50];
-         Float_t xx1[50],yy1[50], xx[50];
-         
-         Int_t nmips=20;
-         for (Int_t i=0; i<24; i++)
-         {
- 
-         for (Int_t im=0; im<nmips; im++)
-         {
-         x1[im]=xx[im]=500+im*200;
-         y1[im]=0;
-         x2[im]=xx1[im]=yy1[im]=260+20*im;
-         } 
-         */      
-       TGraph *grwalkqtc = new TGraph (nmips,x1,y1);
+      TGraph *grwalkqtc = new TGraph (nmips,x1,y1);
       grwalkqtc->SetTitle(Form("PMT%i",i));
       TGraph *grwalkled = new TGraph (nmips,x2,y1);
       grwalkled->SetTitle(Form("PMT%i",i));
@@ -255,8 +235,6 @@ void AliT0CalibWalk::GetMeanAndSigma(TH1F* hist, Float_t &mean, Float_t &sigma)
 {
 
   const double window = 5.;  //fit window 
-  double norm  = hist->Integral();  // normalize to one count
-  hist->Scale(1./norm); 
  
   double meanEstimate, sigmaEstimate; 
   int maxBin;