3 /**************************************************************************
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4 * This file is property of and copyright by the ALICE HLT Project *
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5 * All rights reserved. *
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7 * Primary Authors: Oystein Djuvsland *
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9 * Permission to use, copy, modify and distribute this software and its *
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10 * documentation strictly for non-commercial purposes is hereby granted *
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11 * without fee, provided that the above copyright notice appears in all *
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12 * copies and that both the copyright notice and this permission notice *
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13 * appear in the supporting documentation. The authors make no claims *
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14 * about the suitability of this software for any purpose. It is *
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15 * provided "as is" without express or implied warranty. *
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16 **************************************************************************/
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19 * @file AliHLTCaloClusterizer.cxx
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20 * @author Oystein Djuvsland
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22 * @brief Clusterizer for PHOS HLT
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25 // see header file for class documentation
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27 // refer to README to build package
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29 // visit http://web.ift.uib.no/~kjeks/doc/alice-hlt
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31 #include "AliHLTCaloClusterizer.h"
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32 #include "AliHLTLogging.h"
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34 #include "AliHLTCaloRecPointDataStruct.h"
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35 #include "AliHLTCaloDigitDataStruct.h"
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36 #include "AliHLTCaloDigitContainerDataStruct.h"
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37 #include "AliHLTCaloConstantsHandler.h"
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39 ClassImp(AliHLTCaloClusterizer);
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41 AliHLTCaloClusterizer::AliHLTCaloClusterizer(TString det):
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42 AliHLTCaloConstantsHandler(det),
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43 fCompareFunction(CompareDigitsByPosition),
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45 fRecPointDataPtr(0),
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46 fFirstRecPointPtr(0),
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52 fEmcClusteringThreshold(0),
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53 fEmcMinEnergyThreshold(0),
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55 fDigitsInCluster(0),
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56 fDigitsPointerArray(0),
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57 fDigitContainerPtr(0),
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58 fMaxDigitIndexDiff(0),
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60 fSortedByPosition(false),
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61 fSortedByEnergy(false),
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64 //See header file for documentation
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65 //fEmcClusteringThreshold = 0.2;
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66 //fEmcMinEnergyThreshold = 0.03;
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68 fEmcClusteringThreshold = 0.1;
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69 fEmcMinEnergyThreshold = 0.01;
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70 fEmcTimeGate = 1.e-6 ;
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72 fMaxDigitIndexDiff = 2*fCaloConstants->GetNZROWSMOD();
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76 fRecPointArray = new AliHLTCaloRecPointDataStruct*[fArraySize];
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78 fAvailableSize = sizeof(AliHLTCaloRecPointDataStruct) * 20;
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79 fFirstRecPointPtr = reinterpret_cast<AliHLTCaloRecPointDataStruct*>(new UChar_t[fAvailableSize]);
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80 fRecPointDataPtr = fFirstRecPointPtr;
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84 AliHLTCaloClusterizer::~AliHLTCaloClusterizer()
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86 //See header file for documentation
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90 AliHLTCaloClusterizer::SetRecPointDataPtr(AliHLTCaloRecPointDataStruct* recPointDataPtr)
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92 // See header file for documentation
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93 fRecPointDataPtr = recPointDataPtr;
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97 AliHLTCaloClusterizer::ClusterizeEvent(Int_t nDigits)
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99 //see header file for documentation
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100 Int_t nRecPoints = 0;
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103 fNDigits = nDigits;
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104 fRecPointDataPtr = fFirstRecPointPtr;
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109 //Clusterization starts
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110 for (Int_t i = 0; i < nDigits; i++)
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112 fDigitsInCluster = 0;
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114 HLTDebug("Digit with energy: %f", fDigitsPointerArray[i]->fEnergy);
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116 if (fDigitsPointerArray[i]->fEnergy < fEmcClusteringThreshold && fSortedByEnergy)
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118 // Since we have sorted by energy the next digit will have even lower energy, so we return
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119 return fNRecPoints;
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122 if(fDigitsPointerArray[i]->fAssociatedCluster != -1)
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124 // The digit is added to a previous cluster, continue
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131 // First digit is placed at the fDigits member variable in the recpoint
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132 fDigitIndexPtr = &(fRecPointDataPtr->fDigits);
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134 fRecPointDataPtr->fAmp = 0;
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135 fRecPointDataPtr->fModule = fDigitsPointerArray[i]->fModule;
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137 // Assigning the digit to this rec point
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138 fRecPointDataPtr->fDigits = i;
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139 fUsedSize += sizeof(AliHLTCaloRecPointDataStruct);
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141 // Incrementing the pointer to be ready for new entry
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144 fRecPointDataPtr->fAmp += fDigitsPointerArray[i]->fEnergy;
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147 //fDigitsPointerArray[i]->fEnergy = 0;
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148 fDigitsPointerArray[i]->fAssociatedCluster = fNRecPoints;
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151 fDigitsInCluster++;
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154 // Scanning for the neighbours
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155 if (ScanForNeighbourDigits(i, fRecPointDataPtr) != 0)
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160 //fUsedSize += sizeof(AliHLTCaloRecPointDataStruct) + (fDigitsInCluster-1)*sizeof(AliHLTCaloDigitDataStruct);
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162 fRecPointDataPtr->fMultiplicity = fDigitsInCluster;
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163 fRecPointArray[fNRecPoints] = fRecPointDataPtr;
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165 fRecPointDataPtr = reinterpret_cast<AliHLTCaloRecPointDataStruct*>(fDigitIndexPtr);
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169 }//end of clusterization
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175 AliHLTCaloClusterizer::ScanForNeighbourDigits(Int_t index, AliHLTCaloRecPointDataStruct* recPoint)
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177 //see header file for documentation
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179 // The following cuts can be used if we sort by posisiton. Not tested, but it should be fine...
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180 Int_t max = TMath::Min(fNDigits, (Int_t)fMaxDigitIndexDiff+index);
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181 Int_t min = TMath::Max(0, (Int_t)(index - (Int_t)fMaxDigitIndexDiff));
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183 // All digits for now
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187 for (Int_t j = min; j < max; j++)
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189 if (fDigitsPointerArray[j]->fAssociatedCluster == -1 && fDigitsPointerArray[j]->fEnergy > fEmcMinEnergyThreshold)
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193 if (AreNeighbours(fDigitsPointerArray[index],
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194 fDigitsPointerArray[j]))
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196 // Check that the buffer is large enough for adding a digit (can be heavily improved wrt performance)
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199 // Assigning index to digit
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200 *fDigitIndexPtr = j;
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201 fUsedSize += sizeof(Int_t);
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203 // Incrementing digit pointer to be ready for new entry
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206 // Adding the digit energy to the rec point
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207 fRecPointDataPtr->fAmp += fDigitsPointerArray[j]->fEnergy;
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209 // Setting energy to 0
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210 //fDigitsPointerArray[j]->fEnergy = 0;
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212 // Setting the associated cluster
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213 fDigitsPointerArray[j]->fAssociatedCluster = fNRecPoints;
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215 HLTDebug("Added digit with index: %d, energy: %f, to associated cluster: %d", fDigitsPointerArray[j]->fID, fDigitsPointerArray[j]->fEnergy, fDigitsPointerArray[j]->fAssociatedCluster);
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217 fDigitsInCluster++;
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219 // Scan for neighbours of this digit
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220 ScanForNeighbourDigits(j, recPoint);
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229 AliHLTCaloClusterizer::AreNeighbours(AliHLTCaloDigitDataStruct* digit1,
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230 AliHLTCaloDigitDataStruct* digit2)
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232 //see header file for documentation
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233 if ( (digit1->fModule == digit2->fModule) /*&& (coord1[1]==coord2[1])*/ ) // inside the same PHOS module
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235 Int_t rowdiff = TMath::Abs( digit1->fZ - digit2->fZ );
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236 Int_t coldiff = TMath::Abs( digit1->fX - digit2->fX );
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238 // As in the offline code we define neighbours as cells that share an edge, a corner is not enough
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239 // if (( coldiff <= 1 && rowdiff == 0 ) || ( coldiff == 0 && rowdiff <= 1 ))
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240 if (( coldiff <= 1) || ( rowdiff <= 1 ))
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242 // Check also for time
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243 if (TMath::Abs(digit1->fTime - digit2->fTime ) < fEmcTimeGate)
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254 Int_t AliHLTCaloClusterizer::CheckArray()
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256 // See header file for class documentation
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257 if (fArraySize == fNRecPoints)
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260 AliHLTCaloRecPointDataStruct **tmp = new AliHLTCaloRecPointDataStruct*[fArraySize];
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261 memcpy(tmp, fRecPointArray, fArraySize/2 * sizeof(AliHLTCaloRecPointDataStruct*));
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262 delete [] fRecPointArray;
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263 fRecPointArray = tmp;
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268 Int_t AliHLTCaloClusterizer::CheckBuffer()
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270 // See header file for class documentation
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271 if ((fAvailableSize - fUsedSize) < (Int_t)sizeof(AliHLTCaloRecPointDataStruct))
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273 Int_t recPointOffset = reinterpret_cast<UChar_t*>(fRecPointDataPtr) - reinterpret_cast<UChar_t*>(fFirstRecPointPtr);
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274 Int_t digitIndexOffset = reinterpret_cast<UChar_t*>(fDigitIndexPtr) - reinterpret_cast<UChar_t*>(fRecPointDataPtr);
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275 UChar_t *tmp = new UChar_t[fAvailableSize*2];
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277 memcpy(tmp, fFirstRecPointPtr, fUsedSize);
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278 fAvailableSize *= 2;
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279 for (Int_t n = 0; n < fNRecPoints; n++)
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281 fRecPointArray[n] = reinterpret_cast<AliHLTCaloRecPointDataStruct*>(reinterpret_cast<UChar_t*>(fRecPointArray[n]) - reinterpret_cast<UChar_t*>(fFirstRecPointPtr) + reinterpret_cast<UChar_t*>(tmp));
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283 delete [] fFirstRecPointPtr;
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284 fFirstRecPointPtr = reinterpret_cast<AliHLTCaloRecPointDataStruct*>(tmp);
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285 fRecPointDataPtr = reinterpret_cast<AliHLTCaloRecPointDataStruct*>(tmp + recPointOffset);
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286 fDigitIndexPtr = reinterpret_cast<Int_t*>(reinterpret_cast<UChar_t*>(fRecPointDataPtr) + digitIndexOffset);
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292 void AliHLTCaloClusterizer::SetSortDigitsByPosition()
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294 // Sort the digit pointers by position
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295 fCompareFunction = &CompareDigitsByPosition;
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296 fSortDigits = true;
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297 fSortedByPosition = true;
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300 void AliHLTCaloClusterizer::SetSortDigitsByEnergy()
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302 // See header file for class documentation
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303 fCompareFunction = &CompareDigitsByEnergy;
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304 fSortDigits = true;
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305 fSortedByEnergy = true;
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308 void AliHLTCaloClusterizer::SortDigits()
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310 // See header file for class documentation
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311 if (fSortDigits) qsort(fDigitsPointerArray, fNDigits, sizeof(AliHLTCaloDigitDataStruct*), fCompareFunction);
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315 AliHLTCaloClusterizer::CompareDigitsByPosition(const void *dig0, const void *dig1)
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317 // See header file for documentation
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318 return (*((AliHLTCaloDigitDataStruct**)(dig0)))->fID - (*((AliHLTCaloDigitDataStruct**)(dig1)))->fID;
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322 AliHLTCaloClusterizer::CompareDigitsByEnergy(const void *dig0, const void *dig1)
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324 // See header file for documentation
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325 return (*((AliHLTCaloDigitDataStruct**)(dig1)))->fEnergy - (*((AliHLTCaloDigitDataStruct**)(dig0)))->fEnergy;
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