New version of SPD raw-data reconstruction. The format now correponds to the actual...

[u/mrichter/AliRoot.git] / HLT / misc / AliL3TransBit.cxx

diff --git a/HLT/misc/AliL3TransBit.cxx b/HLT/misc/AliL3TransBit.cxx
index 8249ae3746d2e803b94a31e06ed0df667de88416..2fb9d684b4fec15610192022e40d9b764df0d8f8 100644 (file)
--- a/HLT/misc/AliL3TransBit.cxx
+++ b/HLT/misc/AliL3TransBit.cxx
@@ -1,27 +1,45 @@
-//$Id$
+// @(#) $Id$
 
-// Original author: Marian Ivanov, GSI Darmstadt for AliROOT
-// migrated to L3 by Anders Vestbo <mailto:vestbo@fi.uib.no>
-//*-- Copyright & copy ASV
+// Author: Anders Vestbo <mailto:vestbo@fi.uib.no>
+//*-- Copyright & copy ALICE HLT Group
 
 #include "AliL3StandardIncludes.h"
 
 #include "AliL3TransBit.h"
 
-#if GCCVERSION == 3
+#if __GNUC__ == 3
 using namespace std;
 #endif
 
+/**************************************************************************
+ * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ *                                                                        *
+ * Author: The ALICE Off-line Project.                                    *
+ * Contributors are mentioned in the code where appropriate.              *
+ *                                                                        *
+ * Permission to use, copy, modify and distribute this software and its   *
+ * documentation strictly for non-commercial purposes is hereby granted   *
+ * without fee, provided that the above copyright notice appears in all   *
+ * copies and that both the copyright notice and this permission notice   *
+ * appear in the supporting documentation. The authors make no claims     *
+ * about the suitability of this software for any purpose. It is          *
+ * provided "as is" without express or implied warranty.                  *
+ **************************************************************************/
+
+
+/** \class AliL3Transbit
+<pre>
 //_____________________________________________________________
-// AliL3Transbit (taken from the offline AliROOT code)
+// AliL3Transbit (taken from the offline AliROOT code,
+// original author: Marian Ivanov, GSI Darmstadt for AliROOT)
 //
 // Time Projection Chamber ADC bit compresion lookup table
 //
 //  Conversion equation:
-//    For AliTransBit_v1
+//    For AliTransBitV1
 //    dy/dx= Int_t(1+x/fX0)
 //
-//    For AliTransBit_v2
+//    For AliTransBitV2
 //    y  =(2**bit0) ln(1+x/fX0) / ln(1+(2**bit1-1)/fX0)
 //
 //    where x0 is calculated in function GetOptimumX0()
@@ -30,7 +48,7 @@ using namespace std;
 //    Int_t b0=10;  // original number of bits
 //    Int_t b1=8;   // compressed
 //
-//    AliTransBit_v1 trans;
+//    AliTransBitV1 trans;
 //    Int_t x0=TMath::Nint(TMath::Exp(b0*TMath::Log(2)));
 //    Int_t x1=TMath::Nint(TMath::Exp(b1*TMath::Log(2)));
 //    trans.SetBits(b0,b1);
@@ -45,13 +63,16 @@ using namespace std;
 //
 //    for( Int_t i=0;i<x1-1;i++) cout<<i<<"\t"<<trans.Get1to0(i+1)-trans.Get1to0(i)<<"\n"; > tabled.txt
 //
+</pre>
+*/
 
 ClassImp(AliL3TransBit)
-ClassImp(AliL3TransBit_v1)
-ClassImp(AliL3TransBit_v2)
+ClassImp(AliL3TransBitV1)
+ClassImp(AliL3TransBitV2)
 
 AliL3TransBit::AliL3TransBit()
 {
+  // default constructor
   fTable0 = 0;
   fTable1 = 0;
   fBit0   = 10;
@@ -61,12 +82,12 @@ AliL3TransBit::AliL3TransBit()
 
 AliL3TransBit::~AliL3TransBit() 
 {
-  //default destructor
+  // destructor
   if (fTable0!=0) delete [] fTable0;
   if (fTable1!=0) delete [] fTable1;
 }
 
-Double_t AliL3TransBit_v1::FindOptimumX0()
+Double_t AliL3TransBitV1::FindOptimumX0()
 {
   //find x0 for which derivation at xder1 is equal 1
   Int_t x0=(Int_t)rint(exp(fBit0*log(2.)));
@@ -90,7 +111,7 @@ Double_t AliL3TransBit_v1::FindOptimumX0()
   return fX0;
 }
 
-void AliL3TransBit_v1::Update()
+void AliL3TransBitV1::Update()
 {
   //construct lookup tables for loosy compression from 
   if (fX0<1) fX0 = FindOptimumX0();  
@@ -118,26 +139,26 @@ void AliL3TransBit_v1::Update()
   return;
 }
 
-Double_t AliL3TransBit_v2::FindOptimumX0()
+Double_t AliL3TransBitV2::FindOptimumX0()
 {
   //find x0 for which derivation at xder1 is equal 1
-  const Float_t xder1=1;
-  const Float_t dx=0.1;
+  const Float_t kxder1=1;
+  const Float_t kdx=0.1;
 
   Float_t x0=exp(fBit0*log(2.));
   Float_t x1=exp(fBit1*log(2.));
   Float_t deriv = 0;
   Float_t x;
-  for (x=x1;( (x>1)&&(deriv<1)) ;x-=dx)
+  for (x=x1;( (x>1)&&(deriv<1)) ;x-=kdx)
     {
-      deriv = (x1-1)/( log(1.+x0/x) *x *(1+xder1/x));
+      deriv = (x1-1)/( log(1.+x0/x) *x *(1+kxder1/x));
     }
-  x+=dx/2.;
+  x+=kdx/2.;
   fX0 = x;
   return fX0;
 }
 
-void AliL3TransBit_v2::Update()
+void AliL3TransBitV2::Update()
 {
   //construct lookup tables for loosy compresion from 
   if (fX0<1) fX0 = FindOptimumX0();