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"
50 ClassImp(AliCalcluster) // Class implementation to enable ROOT I/O
52 AliCalcluster::AliCalcluster()
54 // Default constructer, all data is set to 0
61 SetName("AliCalcluster [sig, sig11, sig33, sig55, ...]");
63 ///////////////////////////////////////////////////////////////////////////
64 AliCalcluster::~AliCalcluster()
66 // Destructor to delete dynamically allocated memory
73 ///////////////////////////////////////////////////////////////////////////
74 AliCalcluster::AliCalcluster(AliCalmodule& m)
76 // Cluster constructor with module m as center.
77 // Module data is only entered for a module which contains a signal,
78 // has not been used in a cluster yet, and is not declared dead.
81 // It is advised NOT to start a cluster with modules situated at a detector edge.
82 // This feature is automatically checked when using the built-in clustering
87 Float_t sig=m.GetClusteredSignal();
89 if (sig>0. && m.GetDeadValue()==0)
98 m.SetClusteredSignal(0.); // mark module as used in cluster
112 SetName("AliCalcluster [sig, sig11, sig33, sig55, ...]");
114 ///////////////////////////////////////////////////////////////////////////
115 Int_t AliCalcluster::GetRow()
117 // Provide the row number of the cluster center
120 return fCenter->GetRow();
127 ///////////////////////////////////////////////////////////////////////////
128 Int_t AliCalcluster::GetColumn()
130 // Provide the column number of the cluster center
133 return fCenter->GetColumn();
140 ///////////////////////////////////////////////////////////////////////////
141 Int_t AliCalcluster::GetNmodules()
143 // Provide the number of modules in the cluster
146 ///////////////////////////////////////////////////////////////////////////
147 Float_t AliCalcluster::GetRowDispersion()
149 // Provide the normalised row dispersion of the cluster.
150 Float_t sig=GetSignal();
160 ///////////////////////////////////////////////////////////////////////////
161 Float_t AliCalcluster::GetColumnDispersion()
163 // Provide the normalised column dispersion of the cluster
164 Float_t sig=GetSignal();
174 ///////////////////////////////////////////////////////////////////////////
175 void AliCalcluster::Start(AliCalmodule& m)
177 // Reset cluster data and start with module m.
178 // A module can only start a cluster when it contains a signal,
179 // has not been used in a cluster yet, and is not declared dead.
182 // It is advised NOT to start a cluster with modules situated at a detector edge.
183 // This feature is automatically checked when using the built-in clustering
184 // of AliCalorimeter.
190 if (m.GetClusteredSignal()>0. && m.GetDeadValue()==0)
195 SetSignal(m.GetSignal());
199 m.SetClusteredSignal(0.); // mark module as used in cluster
210 ///////////////////////////////////////////////////////////////////////////
211 void AliCalcluster::Add(AliCalmodule& m)
213 // Add module data to the cluster.
214 // Dead modules are NOT added to the cluster.
215 // According to the distance of the module w.r.t. the cluster center
216 // the various signal values are updated.
220 Float_t sigm=m.GetClusteredSignal();
222 if (sigm>0. && m.GetDeadValue()==0) // only add unused modules
224 Int_t drow=int(fabs(double(GetRow()-m.GetRow()))); // row distance to center
225 Int_t dcol=int(fabs(double(GetColumn()-m.GetColumn()))); // column distance to center
227 // Determine the ring index for this module around the cluster center
229 if (dcol>drow) jring=dcol;
231 Int_t nvalues=GetNvalues();
233 if ((jring+2)<=nvalues) // Module within existing ring(s) ==> Add module signal to the enclosing ring(s)
235 for (Int_t i=(jring+2); i<=nvalues; i++)
240 else // Module outside all existing rings ==> Init. new ring signals with existing enclosed signal(s)
242 for (Int_t j=(nvalues+1); j<=(jring+2); j++)
244 SetSignal(GetSignal(j-1),j);
246 // Add current module signal to the signal value for the corresponding ring
247 AddSignal(sigm,(jring+2));
250 // Update total cluster signal
254 fRowdisp+=sigm*float(drow*drow);
255 fColdisp+=sigm*float(dcol*dcol);
256 m.SetClusteredSignal(0.); // mark module as used in cluster
261 cout << " *AliCalcluster::Add* No action. Cluster should be started first."
265 ///////////////////////////////////////////////////////////////////////////
266 void AliCalcluster::AddVetoSignal(AliSignal& s,Int_t extr)
268 // Associate an (extrapolated) AliSignal as veto to the cluster.
269 // By default a straight line extrapolation is performed which extrapolates
270 // the signal position until the length of its position vector matches that
271 // of the position vector of the cluster.
272 // In this extrapolation procedure the error propagation is performed
274 // Based on the cluster and extrapolated veto signal (x,y) positions and
275 // position errors the confidence level of association is calculated
276 // and stored as an additional signal value.
277 // By means of the GetVetoSignal memberfunction the confidence level of
278 // association can always be updated by the user.
279 // In case the user wants to invoke a more detailed extrapolation procedure,
280 // the automatic extrapolation can be suppressed by setting the argument
281 // extr=0. In this case it is assumed that the AliSignal as entered via
282 // the argument contains already the extrapolated position vector and
283 // corresponding errors.
284 // Note : Three additional values are added to the original AliSignal
285 // to hold the chi2, ndf and confidence level values of the association.
289 fVetos=new TObjArray();
293 Int_t nvalues=s.GetNvalues();
294 AliSignal* sx=new AliSignal(nvalues+3); // Additional value added
295 TString name=s.GetName();
296 name.Append(" + additional chi2, ndf and CL values");
299 Double_t vecc[3],vecv[3];
302 sx->SetPosition((Ali3Vector&)s);
306 // Extrapolate the veto hit position
308 GetPosition(vecc,"sph");
309 s.GetPosition(vecv,"sph");
310 if (vecv[0]) scale=vecc[0]/vecv[0];
311 Ali3Vector r=s*scale;
316 for (Int_t i=1; i<=nvalues; i++)
319 err=s.GetSignalError(i);
320 sx->SetSignal(sig,i);
321 sx->SetSignalError(err,i);
324 // Calculate the confidence level of association
325 GetPosition(vecc,"car");
326 sx->GetPosition(vecv,"car");
327 Double_t dx=vecc[0]-vecv[0];
328 Double_t dy=vecc[1]-vecv[1];
329 GetPositionErrors(vecc,"car");
330 sx->GetPositionErrors(vecv,"car");
331 Double_t sxc2=vecc[0]*vecc[0];
332 Double_t syc2=vecc[1]*vecc[1];
333 Double_t sxv2=vecv[0]*vecv[0];
334 Double_t syv2=vecv[1]*vecv[1];
335 Double_t sumx2=sxc2+sxv2;
336 Double_t sumy2=syc2+syv2;
338 if (sumx2>0 && sumy2>0) chi2=(dx*dx/sumx2)+(dy*dy/sumy2);
341 Double_t prob=m.Prob(chi2,ndf);
342 if (chi2>0) sx->SetSignal(chi2,nvalues+1);
343 if (ndf>0) sx->SetSignal(ndf,nvalues+2);
344 if (prob>0) sx->SetSignal(prob,nvalues+3);
349 ///////////////////////////////////////////////////////////////////////////
350 Int_t AliCalcluster::GetNvetos()
352 // Provide the number of veto signals associated to the cluster
355 ///////////////////////////////////////////////////////////////////////////
356 AliSignal* AliCalcluster::GetVetoSignal(Int_t i)
358 // Provide access to the i-th veto signal of this cluster.
359 // Note : The first hit corresponds to i=1.
362 cout << " *AliCalcluster::GetVetoSignal* No veto signals present." << endl;
367 if (i>0 && i<=fNvetos)
369 return (AliSignal*)fVetos->At(i-1);
373 cout << " *AliCalcluster::GetVetoSignal* Signal number " << i << " out of range."
374 << " Nvetos = " << fNvetos << endl;
379 ///////////////////////////////////////////////////////////////////////////
380 Float_t AliCalcluster::GetVetoLevel()
382 // Provide the confidence level of best associated veto signal.
389 for (Int_t i=0; i<fNvetos; i++)
391 s=((AliSignal*)fVetos->At(i));
394 nvalues=s->GetNvalues();
395 cl=s->GetSignal(nvalues);
396 if (cl>clmax) clmax=cl;
402 ///////////////////////////////////////////////////////////////////////////
403 Int_t AliCalcluster::HasVetoHit(Double_t cl)
405 // Investigate if cluster has an associated veto hit with conf. level > cl.
406 // Returns 1 if there is such an associated veto hit, otherwise returns 0.
407 // Note : This function is faster than GetVetoLevel().
412 for (Int_t i=0; i<fNvetos; i++)
414 s=((AliSignal*)fVetos->At(i));
417 nvalues=s->GetNvalues();
418 if (s->GetSignal(nvalues) > cl) return 1;
424 ///////////////////////////////////////////////////////////////////////////