TRD nSigma OADB related new codes and modifications and OADB root file -- Xianguo Lu

[u/mrichter/AliRoot.git] / ITS / AliITSOnlineSDDBase.cxx

diff --git a/ITS/AliITSOnlineSDDBase.cxx b/ITS/AliITSOnlineSDDBase.cxx
index 25865ba6045780aed2561f30ff484a6d89a3dc7c..15d619da88980d472529b5608be21fbe89584523 100644 (file)
--- a/ITS/AliITSOnlineSDDBase.cxx
+++ b/ITS/AliITSOnlineSDDBase.cxx
@@ -62,7 +62,7 @@ AliITSOnlineSDDBase::~AliITSOnlineSDDBase(){
 }
 //______________________________________________________________________
 void AliITSOnlineSDDBase::Reset(){
-  //
+  // reset all counters
   fNEvents=0;
   for(Int_t i=0;i<fgkNAnodes;i++){
     fGoodAnode[i]=1;
@@ -73,7 +73,7 @@ void AliITSOnlineSDDBase::Reset(){
 }
 //______________________________________________________________________
 void  AliITSOnlineSDDBase::ValidateAnodes(){
-  //
+  // tag good/bad channels
   for(Int_t ian=0;ian<fgkNAnodes;ian++){
     fGoodAnode[ian]=1;
     Float_t basel=GetAnodeBaseline(ian);
@@ -89,7 +89,8 @@ void  AliITSOnlineSDDBase::ValidateAnodes(){
 
 //______________________________________________________________________
 void AliITSOnlineSDDBase::AddEvent(TH2F* hrawd){
-  // 
+  // analyzes one event and adds its ontribution to the various counters
+
   fNEvents++;
   const Int_t kTimeBins=fLastGoodTB+1;
   Float_t sum[fgkNAnodes];
@@ -103,8 +104,10 @@ void AliITSOnlineSDDBase::AddEvent(TH2F* hrawd){
       sumQ+=cbin*cbin;
       cnt++;
     }
-    sum[ian]/=(Float_t)cnt;
-    sumQ/=(Float_t)cnt;
+    if(cnt != 0){
+      sum[ian]/=(Float_t)cnt;
+      sumQ/=(Float_t)cnt;
+    }
     fSumBaseline[ian]+=sum[ian];
     fSumRawNoise[ian]+=sumQ;
   }
@@ -168,7 +171,7 @@ Float_t AliITSOnlineSDDBase::GetMinimumBaseline() const {
 }
 //______________________________________________________________________
 Float_t AliITSOnlineSDDBase::CalcMeanRawNoise() const{
-  //
+  // compute mean value of raw noise
   Float_t meanns=0.;
   Int_t cnt=0;
   for(Int_t ian=0;ian<fgkNAnodes;ian++){
@@ -181,7 +184,10 @@ Float_t AliITSOnlineSDDBase::CalcMeanRawNoise() const{
 }
 //______________________________________________________________________
 void AliITSOnlineSDDBase::WriteToASCII(){
-  //
+  // writes parameters of each channel into an ASCII file 
+  // to be then read in the successive step for common mode noise
+  // correction (AliITSOnlineSDDCMN)
+
   TString outfilnam;
   Float_t basMin,basMax;
   GetMinAndMaxBaseline(basMin,basMax);