1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 ///////////////////////////////////////////////////////////////////////////
19 // Class AliCalcluster
20 // Description of a cluster of calorimeter modules.
21 // A 2D (matrix) geometry is assumed in which a cluster center is identified
22 // by two integer indices (i,j), e.g. row and column indicators.
24 // The 1st signal value is the signal of the complete cluster.
25 // This is the signal which is provided as default by invoking GetSignal().
27 // In case clustering/grouping of module signals was performed over several
28 // rings around the center (see e.g. AliCalorimeter::Group), the following
29 // additional information is provided by the various signal values :
31 // The 2nd signal value is the original signal of the central module.
32 // The 3rd signal value is the total signal within the 1st (i.e. 3x3) ring of
33 // modules around the cluster center.
34 // The 4th signal value is the total signal within the 2nd (i.e. 5x5) ring of
35 // modules around the cluster center.
38 // Note : In case the cluster consists of only 1 module, then only the
39 // 1st signal value will be present (for obvious reasons).
41 // Some dispersion info about cluster topology is provided in order
42 // to enable EM or hadronic cluster identification.
44 //--- Author: Nick van Eijndhoven 13-jun-1997 UU-SAP Utrecht
45 //- Modified: NvE $Date$ UU-SAP Utrecht
46 ///////////////////////////////////////////////////////////////////////////
48 #include "AliCalcluster.h"
49 #include "Riostream.h"
51 ClassImp(AliCalcluster) // Class implementation to enable ROOT I/O
53 AliCalcluster::AliCalcluster() : AliSignal()
55 // Default constructor, all data is set to 0
63 SetName("AliCalcluster [sig, sig11, sig33, sig55,...]");
65 ///////////////////////////////////////////////////////////////////////////
66 AliCalcluster::~AliCalcluster()
68 // Destructor to delete dynamically allocated memory
75 ///////////////////////////////////////////////////////////////////////////
76 AliCalcluster::AliCalcluster(AliCalcluster& c) : AliSignal(c)
86 fVetos=new TObjArray();
89 for (Int_t i=1; i<=fNvetos; i++)
91 AliSignal* sx=c.GetVetoSignal(i);
92 fVetos->Add(new AliSignal(*sx));
95 ///////////////////////////////////////////////////////////////////////////
96 AliCalcluster::AliCalcluster(AliCalmodule& m) : AliSignal()
98 // Cluster constructor with module m as center.
99 // Module data is only entered for a module which contains a signal,
100 // has not been used in a cluster yet, and is not declared dead.
103 // It is advised NOT to start a cluster with modules situated at a detector edge.
104 // This feature is automatically checked when using the built-in clustering
105 // of AliCalorimeter.
109 Float_t sig=m.GetClusteredSignal();
111 if (sig>0. && m.GetDeadValue()==0)
121 m.SetClusteredSignal(0.); // mark module as used in cluster
136 SetName("AliCalcluster [sig, sig11, sig33, sig55,...]");
138 ///////////////////////////////////////////////////////////////////////////
139 Int_t AliCalcluster::GetRow()
141 // Provide the row number of the cluster center
144 ///////////////////////////////////////////////////////////////////////////
145 Int_t AliCalcluster::GetColumn()
147 // Provide the column number of the cluster center
150 ///////////////////////////////////////////////////////////////////////////
151 Int_t AliCalcluster::GetNmodules()
153 // Provide the number of modules in the cluster
156 ///////////////////////////////////////////////////////////////////////////
157 Float_t AliCalcluster::GetRowDispersion()
159 // Provide the normalised row dispersion of the cluster.
160 Float_t sig=GetSignal();
170 ///////////////////////////////////////////////////////////////////////////
171 Float_t AliCalcluster::GetColumnDispersion()
173 // Provide the normalised column dispersion of the cluster
174 Float_t sig=GetSignal();
184 ///////////////////////////////////////////////////////////////////////////
185 void AliCalcluster::Start(AliCalmodule& m)
187 // Reset cluster data and start with module m.
188 // A module can only start a cluster when it contains a signal,
189 // has not been used in a cluster yet, and is not declared dead.
192 // It is advised NOT to start a cluster with modules situated at a detector edge.
193 // This feature is automatically checked when using the built-in clustering
194 // of AliCalorimeter.
200 if (m.GetClusteredSignal()>0. && m.GetDeadValue()==0)
206 SetSignal(m.GetSignal());
210 m.SetClusteredSignal(0.); // mark module as used in cluster
222 ///////////////////////////////////////////////////////////////////////////
223 void AliCalcluster::Add(AliCalmodule& m)
225 // Add module data to the cluster.
226 // Dead modules are NOT added to the cluster.
227 // According to the distance of the module w.r.t. the cluster center
228 // the various signal values are updated.
232 Float_t sigm=m.GetClusteredSignal();
234 if (sigm>0. && m.GetDeadValue()==0) // only add unused modules
236 Int_t drow=int(fabs(double(GetRow()-m.GetRow()))); // row distance to center
237 Int_t dcol=int(fabs(double(GetColumn()-m.GetColumn()))); // column distance to center
239 // Determine the ring index for this module around the cluster center
241 if (dcol>drow) jring=dcol;
243 Int_t nvalues=GetNvalues();
245 if ((jring+2)<=nvalues) // Module within existing ring(s) ==> Add module signal to the enclosing ring(s)
247 for (Int_t i=(jring+2); i<=nvalues; i++)
252 else // Module outside all existing rings ==> Init. new ring signals with existing enclosed signal(s)
254 for (Int_t j=(nvalues+1); j<=(jring+2); j++)
256 SetSignal(GetSignal(j-1),j);
258 // Add current module signal to the signal value for the corresponding ring
259 AddSignal(sigm,(jring+2));
262 // Update total cluster signal
266 fRowdisp+=sigm*float(drow*drow);
267 fColdisp+=sigm*float(dcol*dcol);
268 m.SetClusteredSignal(0.); // mark module as used in cluster
273 cout << " *AliCalcluster::Add* No action. Cluster should be started first."
277 ///////////////////////////////////////////////////////////////////////////
278 void AliCalcluster::AddVetoSignal(AliSignal& s,Int_t extr)
280 // Associate an (extrapolated) AliSignal as veto to the cluster.
281 // By default a straight line extrapolation is performed which extrapolates
282 // the signal position until the length of its position vector matches that
283 // of the position vector of the cluster.
284 // In this extrapolation procedure the error propagation is performed
286 // Based on the cluster and extrapolated veto signal (x,y) positions and
287 // position errors the confidence level of association is calculated
288 // and stored as an additional signal value.
289 // By means of the GetVetoSignal memberfunction the confidence level of
290 // association can always be updated by the user.
291 // In case the user wants to invoke a more detailed extrapolation procedure,
292 // the automatic extrapolation can be suppressed by setting the argument
293 // extr=0. In this case it is assumed that the AliSignal as entered via
294 // the argument contains already the extrapolated position vector and
295 // corresponding errors.
296 // Note : Three additional values are added to the original AliSignal
297 // to hold the chi2, ndf and confidence level values of the association.
301 fVetos=new TObjArray();
305 Int_t nvalues=s.GetNvalues();
306 AliSignal* sx=new AliSignal(s); // Additional values will be added
307 TString name=s.GetName();
308 name.Append(" + additional chi2, ndf and CL values");
311 Double_t vecc[3],vecv[3];
314 // Extrapolate the veto hit position
316 GetPosition(vecc,"sph");
317 s.GetPosition(vecv,"sph");
318 if (vecv[0]) scale=vecc[0]/vecv[0];
319 Ali3Vector r=s*scale;
323 // Calculate the confidence level of association
324 GetPosition(vecc,"car");
325 sx->GetPosition(vecv,"car");
326 Double_t dx=vecc[0]-vecv[0];
327 Double_t dy=vecc[1]-vecv[1];
328 GetPositionErrors(vecc,"car");
329 sx->GetPositionErrors(vecv,"car");
330 Double_t sxc2=vecc[0]*vecc[0];
331 Double_t syc2=vecc[1]*vecc[1];
332 Double_t sxv2=vecv[0]*vecv[0];
333 Double_t syv2=vecv[1]*vecv[1];
334 Double_t sumx2=sxc2+sxv2;
335 Double_t sumy2=syc2+syv2;
337 if (sumx2>0 && sumy2>0) chi2=(dx*dx/sumx2)+(dy*dy/sumy2);
340 Double_t prob=m.Prob(chi2,ndf);
341 if (chi2>0) sx->SetSignal(chi2,nvalues+1);
342 if (ndf>0) sx->SetSignal(ndf,nvalues+2);
343 if (prob>0) sx->SetSignal(prob,nvalues+3);
348 ///////////////////////////////////////////////////////////////////////////
349 Int_t AliCalcluster::GetNvetos()
351 // Provide the number of veto signals associated to the cluster
354 ///////////////////////////////////////////////////////////////////////////
355 AliSignal* AliCalcluster::GetVetoSignal(Int_t i)
357 // Provide access to the i-th veto signal of this cluster.
358 // Note : The first hit corresponds to i=1.
361 cout << " *AliCalcluster::GetVetoSignal* No veto signals present." << endl;
366 if (i>0 && i<=fNvetos)
368 return (AliSignal*)fVetos->At(i-1);
372 cout << " *AliCalcluster::GetVetoSignal* Signal number " << i << " out of range."
373 << " Nvetos = " << fNvetos << endl;
378 ///////////////////////////////////////////////////////////////////////////
379 Float_t AliCalcluster::GetVetoLevel()
381 // Provide the confidence level of best associated veto signal.
388 for (Int_t i=0; i<fNvetos; i++)
390 s=((AliSignal*)fVetos->At(i));
393 nvalues=s->GetNvalues();
394 cl=s->GetSignal(nvalues);
395 if (cl>clmax) clmax=cl;
401 ///////////////////////////////////////////////////////////////////////////
402 Int_t AliCalcluster::HasVetoHit(Double_t cl)
404 // Investigate if cluster has an associated veto hit with conf. level > cl.
405 // Returns 1 if there is such an associated veto hit, otherwise returns 0.
406 // Note : This function is faster than GetVetoLevel().
411 for (Int_t i=0; i<fNvetos; i++)
413 s=((AliSignal*)fVetos->At(i));
416 nvalues=s->GetNvalues();
417 if (s->GetSignal(nvalues) > cl) return 1;
423 ///////////////////////////////////////////////////////////////////////////