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 ///////////////////////////////////////////////////////////////////////////
20 // Creation and investigation of an AliVertex.
21 // An AliVertex can be constructed by adding AliTracks and/or AliJets.
23 // Note : Also (secondary) vertices can be added to a vertex.
25 // To provide maximal flexibility to the user, two modes of vertex storage
26 // are provided by means of the memberfunction SetVertexCopy().
27 // The same holds for the storage of jets via SetJetCopy().
29 // a) SetVertexCopy(0) (which is the default).
30 // Only the pointers of the 'added' vertices are stored.
31 // This mode is typically used by making vertex studies based on a fixed list
32 // of vertices which stays under user control or is contained for instance
34 // In this way the AliVertex just represents a 'logical structure' for the
35 // physics analysis which can be embedded in e.g. an AliEvent or AliVertex.
38 // Modifications made to the original vertices also affect the AliVertex objects
41 // b) SetVertexCopy(1).
42 // Of every 'added' vertex a private copy will be made of which the pointer
44 // In this way the AliVertex represents an entity on its own and modifications
45 // made to the original vertices do not affect the AliVertex objects which are
47 // This mode will allow 'adding' many different AliVertex objects by
48 // creating only one AliVertex instance in the main programme and using the
49 // AliVertex::Reset, AliVertex::AddTrack and parameter setting memberfunctions.
51 // See also the documentation provided for the memberfunction SetOwner().
53 // Coding example to make 3 vertices v1, v2 and v3.
54 // ------------------------------------------------
55 // v1 contains the tracks 1,2,3 and 4
56 // v2 contains many different tracks
57 // v3 contains the jets 1 and 2
59 // AliTrack t1,t2,t3,t4;
61 // ... // code to fill the track data
66 // ... // code to fill the jet data
70 // v1.SetVertexCopy(1);
77 // Float_t r1[3]={2.4,0.1,-8.5};
78 // v1.SetPosition(r1,"car");
81 // v2.SetTrackCopy(1);
83 // AliTrack* tx=new AliTrack();
84 // for (Int_t i=0; i<10; i++)
87 // ... // code to fill the track data
93 // Float_t r2[3]={1.6,-3.2,5.7};
94 // v2.SetPosition(r2,"car");
101 // Float_t r3[3]={6.2,4.8,1.3};
102 // v3.SetPosition(r3,"car");
108 // Float_t e1=v1.GetEnergy();
109 // Ali3Vector p1=v1.Get3Momentum();
111 // v1.GetPosition(loc,"sph");
112 // AliPosition r=v2.GetPosition();
114 // Int_t nt=v2.GetNtracks();
115 // AliTrack* tv=v2.GetTrack(1); // Access track number 1 of Vertex v2
117 // Specify the vertices v2 and v3 as secondary vertices of v1
124 // Int_t nv=v1.GetNvtx();
125 // AliVertex* vx=v1.GetVertex(1); // Access 1st secondary vertex of v1
126 // Float_t e=vx->GetEnergy();
128 // Float_t M=v1.GetInvmass();
130 // Reconstruct Vertex v1 from scratch
133 // v1.SetNvmax(25); // Increase initial no. of sec. vertices
137 // Float_t pos[3]={7,9,4};
138 // v1.SetPosition(pos,"car");
140 // Note : All quantities are in GeV, GeV/c or GeV/c**2
142 //--- Author: Nick van Eijndhoven 04-apr-1998 UU-SAP Utrecht
143 //- Modified: NvE $Date$ UU-SAP Utrecht
144 ///////////////////////////////////////////////////////////////////////////
146 #include "AliVertex.h"
147 #include "Riostream.h"
149 ClassImp(AliVertex) // Class implementation to enable ROOT I/O
151 AliVertex::AliVertex() : AliJet(),AliPosition()
153 // Default constructor.
154 // All variables initialised to 0.
155 // Initial maximum number of tracks is set to the default value.
156 // Initial maximum number of sec. vertices is set to the default value.
162 ///////////////////////////////////////////////////////////////////////////
163 void AliVertex::Init()
165 // Initialisation of pointers etc...
176 ///////////////////////////////////////////////////////////////////////////
177 AliVertex::AliVertex(Int_t n) : AliJet(n),AliPosition()
179 // Create a vertex to hold initially a maximum of n tracks
180 // All variables initialised to 0
183 cout << " *** This AliJet initialisation was invoked via the AliVertex ctor." << endl;
190 ///////////////////////////////////////////////////////////////////////////
191 AliVertex::~AliVertex()
193 // Default destructor
220 ///////////////////////////////////////////////////////////////////////////
221 void AliVertex::SetOwner(Bool_t own)
223 // Set ownership of all added objects.
224 // The default parameter is own=kTRUE.
226 // Invokation of this memberfunction also sets all the copy modes
227 // (e.g. TrackCopy & co.) according to the value of own.
229 // This function (with own=kTRUE) is particularly useful when reading data
230 // from a tree/file, since Reset() will then actually remove all the
231 // added objects from memory irrespective of the copy mode settings
232 // during the tree/file creation process. In this way it provides a nice way
233 // of preventing possible memory leaks in the reading/analysis process.
235 // In addition this memberfunction can also be used as a shortcut to set all
236 // copy modes in one go during a tree/file creation process.
237 // However, in this case the user has to take care to only set/change the
238 // ownership (and copy mode) for empty objects (e.g. newly created objects
239 // or after invokation of the Reset() memberfunction) otherwise it will
240 // very likely result in inconsistent destructor behaviour.
244 if (fVertices) fVertices->SetOwner(own);
246 if (fJets) fJets->SetOwner(own);
249 AliJet::SetOwner(own);
251 ///////////////////////////////////////////////////////////////////////////
252 AliVertex::AliVertex(const AliVertex& v) : AliJet(v.fNtinit),AliPosition(v)
260 SetTrackCopy(v.GetTrackCopy());
261 SetVertexCopy(v.GetVertexCopy());
262 SetJetCopy(v.GetJetCopy());
265 // Copy all tracks except the ones coming from jets
267 Int_t jetflag=0,connect=0;
269 for (Int_t it=1; it<=v.fNtrk; it++)
274 jetflag=v.IsJetTrack(tx);
275 connect=v.IsConnectTrack(tx);
277 if (!jetflag && !connect) AddTrack(tx);
283 fConnects=new TObjArray(fNvmax);
284 if (!fTrackCopy) fConnects->SetOwner();
286 tx2=new AliTrack(*tx);
293 // Copy all the (secondary) vertices without re-creating connecting tracks
294 // The connecting tracks have already been copied above
296 for (Int_t iv=1; iv<=v.GetNvertices(); iv++)
299 if (vx) AddVertex(vx,0);
302 // Copy all the jets including the jet tracks for these jets for which
303 // this was also the case in the original vertex
305 for (Int_t ij=1; ij<=v.GetNjets(); ij++)
311 if (jx->GetNtracks())
316 jetflag=v.IsJetTrack(tx);
323 ///////////////////////////////////////////////////////////////////////////
324 void AliVertex::SetNvmax(Int_t n)
326 // Set the initial maximum number of (secondary) vertices
341 ///////////////////////////////////////////////////////////////////////////
342 void AliVertex::SetNjmax(Int_t n)
344 // Set the initial maximum number of jets
359 ///////////////////////////////////////////////////////////////////////////
360 void AliVertex::Reset()
362 // Reset all variables to 0 and reset all stored vertex and jet lists.
363 // The max. number of tracks is set to the initial value again
364 // The max. number of vertices is set to the default value again
365 // The max. number of jets is set to the default value again
369 Double_t a[3]={0,0,0};
370 SetPosition(a,"sph");
371 SetPositionErrors(a,"car");
374 if (fNvmax>0) SetNvmax(fNvmax);
382 if (fNjmax>0) SetNjmax(fNjmax);
395 ///////////////////////////////////////////////////////////////////////////
396 void AliVertex::ResetVertices()
398 // Reset the stored vertex list and delete all connecting tracks which
399 // were generated automatically via connect=1 in AddVertex().
400 // The max. number of vertices is set to the default value again.
401 // All physics quantities are updated according to the removal of the
402 // connecting tracks.
406 for (Int_t i=0; i<=fConnects->GetLast(); i++)
408 t=(AliTrack*)fConnects->At(i);
409 AliTrack* test=(AliTrack*)fTracks->Remove(t);
413 (Ali4Vector&)(*this)-=(Ali4Vector&)(*t);
415 if (fTrackCopy) delete t;
422 if (fNvmax>0) SetNvmax(fNvmax);
429 ///////////////////////////////////////////////////////////////////////////
430 void AliVertex::AddJet(AliJet& j,Int_t tracks)
432 // Add a jet (and its tracks) to the vertex
433 // In case the maximum number of jets has been reached,
434 // the array space will be extended automatically
436 // Note : By default the tracks of the jet are added to the current (primary)
438 // The automatic addition of the tracks of the jet can be suppressed
439 // by specifying tracks=0. In this case only the AliJet object will
440 // be stored according to the mode specified by SetJetCopy().
441 // The latter will enable jet studies based on a fixed list of tracks
442 // as contained e.g. in an AliVertex or AliEvent.
444 // In case a private copy is made, this is performed via the Clone() memberfunction.
445 // All AliJet and derived classes have the default TObject::Clone() memberfunction.
446 // However, derived classes generally contain an internal data structure which may
447 // include pointers to other objects. Therefore it is recommended to provide
448 // for all derived classes a specific copy constructor and override the default Clone()
449 // memberfunction using this copy constructor.
450 // An example for this may be seen from AliJet.
454 fJets=new TObjArray(fNjmax);
455 if (fJetCopy) fJets->SetOwner();
457 if (fNjets == fNjmax) // Check if maximum jet number is reached
460 fJets->Expand(fNjmax);
463 // Add the jet to the list
465 if (fJetCopy) jx=(AliJet*)j.Clone();
473 // Add the tracks of the jet to this vertex
478 fJetTracks=new TObjArray();
480 Int_t copy=1-(jx->GetTrackCopy());
482 for (Int_t i=1; i<=jx->GetNtracks(); i++)
493 ///////////////////////////////////////////////////////////////////////////
494 void AliVertex::AddVertex(AliVertex& v,Int_t connect)
496 // Add a (secondary) vertex to the current vertex.
497 // In case the maximum number of (secondary) vertices has been reached,
498 // the array space will be extended automatically
500 // Note : By default the 4-momentum and charge of the current (primary) vertex
501 // are updated by automatically creating the track connecting
502 // both vertices. The track parameters are taken from the
503 // 4-momentum and charge of the secondary vertex.
504 // The automatic creation of the connecting track and updating
505 // of the (primary) vertex 4-momentum and charge can be suppressed
506 // by specifying connect=0. In this case, however, the user
507 // has to introduce the connecting track lateron by hand
508 // explicitly in order to match the kinematics and charge.
510 // In case a private copy is made, this is performed via the Clone() memberfunction.
511 // All AliVertex and derived classes have the default TObject::Clone() memberfunction.
512 // However, derived classes generally contain an internal data structure which may
513 // include pointers to other objects. Therefore it is recommended to provide
514 // for all derived classes a specific copy constructor and override the default Clone()
515 // memberfunction using this copy constructor.
516 // An example for this may be seen from AliVertex.
520 fVertices=new TObjArray(fNvmax);
521 if (fVertexCopy) fVertices->SetOwner();
523 if (fNvtx == fNvmax) // Check if maximum vertex number is reached
526 fVertices->Expand(fNvmax);
529 // Add the linked (secondary) vertex to the list
531 if (fVertexCopy) vx=(AliVertex*)v.Clone();
539 // Create connecting track and update 4-momentum and charge for current vertex
542 AliTrack* t=new AliTrack();
543 t->SetBeginPoint(GetPosition());
544 t->SetEndPoint(v.GetPosition());
545 t->SetCharge(v.GetCharge());
546 t->Set4Momentum((Ali4Vector&)v);
552 fConnects=new TObjArray(fNvmax);
553 if (!fTrackCopy) fConnects->SetOwner();
558 ///////////////////////////////////////////////////////////////////////////
559 void AliVertex::Data(TString f,TString u)
561 // Provide vertex information within the coordinate frame f
563 // The string argument "u" allows to choose between different angular units
564 // in case e.g. a spherical frame is selected.
565 // u = "rad" : angles provided in radians
566 // "deg" : angles provided in degrees
568 // The defaults are f="car" and u="rad".
570 const char* name=GetName();
571 const char* title=GetTitle();
572 cout << " *AliVertex::Data*";
573 if (strlen(name)) cout << " Name : " << GetName();
574 if (strlen(title)) cout << " Title : " << GetTitle();
576 cout << " Id : " << fUserId << " Invmass : " << GetInvmass()
577 << " Charge : " << GetCharge() << " Momentum : " << GetMomentum()
578 << " Ntracks : " << GetNtracks() << " Nvertices : " << fNvtx
579 << " Njets : " << fNjets << endl;
581 Ali4Vector::Data(f,u);
583 AliPosition::Data(f,u);
585 ///////////////////////////////////////////////////////////////////////////
586 void AliVertex::List(TString f,TString u)
588 // Provide primary track and sec. vertex information within the coordinate frame f
590 // The string argument "u" allows to choose between different angular units
591 // in case e.g. a spherical frame is selected.
592 // u = "rad" : angles provided in radians
593 // "deg" : angles provided in degrees
595 // The defaults are f="car" and u="rad".
597 Data(f,u); // Information of the current vertex
599 // The tracks of this vertex
601 for (Int_t it=1; it<=GetNtracks(); it++)
606 cout << " ---Track no. " << it << endl;
612 cout << " *AliVertex::List* Error : No track present." << endl;
616 // The secondary vertices of this vertex
618 for (Int_t iv=1; iv<=GetNvertices(); iv++)
623 cout << " ---Level 1 sec. vertex no. " << iv << endl;
629 cout << " *AliVertex::List* Error : No sec. vertex present." << endl;
633 ///////////////////////////////////////////////////////////////////////////
634 void AliVertex::ListAll(TString f,TString u)
636 // Provide complete (sec) vertex and (decay) track info within the coordinate frame f
638 // The string argument "u" allows to choose between different angular units
639 // in case e.g. a spherical frame is selected.
640 // u = "rad" : angles provided in radians
641 // "deg" : angles provided in degrees
643 // The defaults are f="car" and u="rad".
645 Data(f,u); // Information of the current vertex
647 // The tracks of this vertex
649 for (Int_t it=1; it<=GetNtracks(); it++)
654 cout << " ---Track no. " << it << endl;
660 cout << " *AliVertex::ListAll* Error : No track present." << endl;
665 Dumps(v,1,f,u); // Information of all sec. vertices
667 //////////////////////////////////////////////////////////////////////////
668 void AliVertex::Dumps(AliVertex* v,Int_t n,TString f,TString u)
670 // Recursively provide the info of all secondary vertices of this vertex
672 for (Int_t iv=1; iv<=v->GetNvertices(); iv++)
677 cout << " ---Level " << n << " sec. vertex no. " << iv << endl;
681 // The tracks of this vertex
683 for (Int_t it=1; it<=vs->GetNtracks(); it++)
688 cout << " ---Track no. " << it << endl;
694 cout << " *AliVertex::Dumps* Error : No track present." << endl;
698 // Go for next sec. vertex level of this sec. vertex recursively
703 cout << " *AliVertex::Dumps* Error : No sec. vertex present." << endl;
707 //////////////////////////////////////////////////////////////////////////
708 Int_t AliVertex::GetNvertices() const
710 // Return the current number of (secondary) vertices
713 ///////////////////////////////////////////////////////////////////////////
714 AliVertex* AliVertex::GetVertex(Int_t i) const
716 // Return the i-th (secondary) vertex of the current vertex
719 cout << " *AliVertex*::GetVertex* No (secondary) vertices present." << endl;
726 cout << " *AliVertex*::GetVertex* Invalid argument i : " << i
727 << " Nvtx = " << fNvtx << endl;
732 return (AliVertex*)fVertices->At(i-1);
736 ///////////////////////////////////////////////////////////////////////////
737 AliVertex* AliVertex::GetIdVertex(Int_t id) const
739 // Return the (sec.) vertex with user identifier "id"
744 cout << " *AliVertex*::GetIdVertex* No (secondary) vertices present." << endl;
749 for (Int_t i=0; i<fNvtx; i++)
751 vx=(AliVertex*)fVertices->At(i);
752 if (id == vx->GetId()) v=vx;
757 ///////////////////////////////////////////////////////////////////////////
758 void AliVertex::SetVertexCopy(Int_t j)
760 // (De)activate the creation of private copies of the added vertices.
761 // j=0 ==> No private copies are made; pointers of original vertices are stored.
762 // j=1 ==> Private copies of the vertices are made and these pointers are stored.
764 // Note : Once the storage contains pointer(s) to AliVertex objects one cannot
765 // change the VertexCopy mode anymore.
766 // To change the VertexCopy mode for an existing AliVertex containing
767 // vertices one first has to invoke Reset().
776 cout << "*AliVertex::SetVertexCopy* Invalid argument : " << j << endl;
781 cout << "*AliVertex::SetVertexCopy* Storage already contained vertices."
782 << " ==> VertexCopy mode not changed." << endl;
785 ///////////////////////////////////////////////////////////////////////////
786 Int_t AliVertex::GetVertexCopy() const
788 // Provide value of the VertexCopy mode.
789 // 0 ==> No private copies are made; pointers of original vertices are stored.
790 // 1 ==> Private copies of the vertices are made and these pointers are stored.
793 ///////////////////////////////////////////////////////////////////////////
794 Int_t AliVertex::GetNjets() const
796 // Return the current number of jets
799 ///////////////////////////////////////////////////////////////////////////
800 AliJet* AliVertex::GetJet(Int_t i) const
802 // Return the i-th jet of the current vertex
805 cout << " *AliVertex*::GetJet* No jets present." << endl;
810 if (i<=0 || i>fNjets)
812 cout << " *AliVertex*::GetJet* Invalid argument i : " << i
813 << " Njets = " << fNjets << endl;
818 return (AliJet*)fJets->At(i-1);
822 ///////////////////////////////////////////////////////////////////////////
823 AliJet* AliVertex::GetIdJet(Int_t id) const
825 // Return the jet with user identifier "id"
830 cout << " *AliVertex*::GetIdJet* No jets present." << endl;
835 for (Int_t i=0; i<fNjets; i++)
837 jx=(AliJet*)fJets->At(i);
838 if (id == jx->GetId()) j=jx;
843 ///////////////////////////////////////////////////////////////////////////
844 void AliVertex::SetJetCopy(Int_t j)
846 // (De)activate the creation of private copies of the added jets.
847 // j=0 ==> No private copies are made; pointers of original jets are stored.
848 // j=1 ==> Private copies of the jets are made and these pointers are stored.
850 // Note : Once the storage contains pointer(s) to AliJet objects one cannot
851 // change the JetCopy mode anymore.
852 // To change the JetCopy mode for an existing AliVertex containing
853 // jets one first has to invoke Reset().
862 cout << "*AliVertex::SetJetCopy* Invalid argument : " << j << endl;
867 cout << "*AliVertex::SetJetCopy* Storage already contained jets."
868 << " ==> JetCopy mode not changed." << endl;
871 ///////////////////////////////////////////////////////////////////////////
872 Int_t AliVertex::GetJetCopy() const
874 // Provide value of the JetCopy mode.
875 // 0 ==> No private copies are made; pointers of original jets are stored.
876 // 1 ==> Private copies of the jets are made and these pointers are stored.
879 ///////////////////////////////////////////////////////////////////////////
880 Int_t AliVertex::IsConnectTrack(AliTrack* t) const
882 // Indicate whether a track from the tracklist was created via the
883 // connection of a (secondary) vertex or not.
884 // In case the track was the result of (secondary) vertex addition the
885 // return value is 1, otherwise the value 0 will be returned.
889 if (fConnects->FindObject(t)) connect=1;
893 ///////////////////////////////////////////////////////////////////////////
894 Int_t AliVertex::IsJetTrack(AliTrack* t) const
896 // Indicate whether a track from the tracklist was created via the
897 // addition of a jet or not.
898 // In case the track was the result of jet addition the return value is 1,
899 // otherwise the value 0 will be returned.
903 if (fJetTracks->FindObject(t)) jetflag=1;
907 ///////////////////////////////////////////////////////////////////////////
908 void AliVertex::Draw(Int_t secs,Int_t cons,Int_t jets)
910 // 3-Dimensional visualisation of an AliVertex with its attributes.
911 // The displayed tracklength is proportional to the momentum of the track.
913 // Color conventions :
914 // -------------------
915 // positive track : red
916 // neutral track : green
917 // negative track : blue
918 // jet-track : magenta (if explicit marking selected)
920 // secs = 1 --> Draw secondary vertices. (Default)
921 // 0 --> Don't draw secondary vertices.
923 // cons = 1 --> Draw (auto generated) connecting tracks. (Default)
924 // 0 --> Don't draw (auto generated) connecting tracks.
926 // jets = 1 --> Mark tracks belonging to jets.
927 // 0 --> Don't mark jet-tracks. (Default)
931 // Auto generated connecting tracks will be drawn as thin lines.
932 // Tracks belonging to jets will be marked as somewhat thinner magenta lines.
933 // This memberfunction is used recursively.
935 Double_t vec[3]={0,0,0};
944 if (fLines) delete fLines;
945 fLines=new TObjArray();
948 Int_t ntk=GetNtracks();
949 for (Int_t jtk=1; jtk<=ntk; jtk++)
955 charge=tx->GetCharge();
957 TPolyLine3D* line=new TPolyLine3D();
960 if (IsConnectTrack(tx))
964 r=tx->GetBeginPoint();
966 r->GetPosition(vec,"car");
967 line->SetNextPoint(vec[0],vec[1],vec[2]);
970 r->GetPosition(vec,"car");
971 line->SetNextPoint(vec[0],vec[1],vec[2]);
972 line->SetLineWidth(1);
977 r=tx->GetClosestPoint();
979 r->GetPosition(vec,"car");
980 line->SetNextPoint(vec[0],vec[1],vec[2]);
981 p=tx->Get3Momentum();
983 p.GetVector(vec,"car");
984 line->SetNextPoint(vec[0],vec[1],vec[2]);
985 line->SetLineWidth(3);
988 line->SetLineColor(kGreen); // Neutral track
989 if (charge>0) line->SetLineColor(kRed); // Positive track
990 if (charge<0) line->SetLineColor(kBlue); // Negative track
992 // Mark tracks belonging to jets
997 line->SetLineWidth(2);
998 line->SetLineColor(kMagenta);
1005 // Go for secondary vertices if selected
1008 Int_t nvtx=GetNvertices();
1009 for (Int_t jvtx=1; jvtx<=nvtx; jvtx++)
1012 if (vx) vx->Draw(secs,cons,jets);
1016 ///////////////////////////////////////////////////////////////////////////
1017 TObjArray* AliVertex::SortJets(Int_t mode,TObjArray* jets)
1019 // Order the references to an array of jets by looping over the input array "jets"
1020 // and checking the value of a certain observable.
1021 // The ordered array is returned as a TObjArray.
1022 // In case jets=0 (default), the registered jets of the current vertex are used.
1023 // Note that the original jet array is not modified.
1024 // Via the "mode" argument the user can specify the observable to be checked upon
1025 // and specify whether sorting should be performed in decreasing order (mode<0)
1026 // or in increasing order (mode>0).
1028 // The convention for the observable selection is the following :
1029 // mode : 1 ==> Number of tracks in the jet
1031 // 3 ==> Jet momentum
1032 // 4 ==> Invariant mass of the jet
1033 // 5 ==> Transverse momentum of the jet
1034 // 6 ==> Longitudinal momentum of the jet
1035 // 7 ==> Transverse energy of the jet
1036 // 8 ==> Longitudinal energy of the jet
1037 // 9 ==> Transverse mass of the jet
1038 // 10 ==> Jet rapidity
1039 // 11 ==> Pseudo-rapidity of the jet
1041 // The default is mode=-1.
1043 // Note : This sorting routine uses a common area in memory, which is used
1044 // by various other sorting facilities as well.
1045 // This means that the resulting sorted TObjArray may be overwritten
1046 // when another sorting is invoked.
1047 // To retain the sorted list of pointers, the user is advised to copy
1048 // the pointers contained in the returned TObjArray into a private
1049 // TObjArray instance.
1057 if (!jets) jets=fJets;
1059 if (abs(mode)>11 || !jets) return fSelected;
1061 Int_t njets=jets->GetEntries();
1068 fSelected=new TObjArray(njets);
1071 Double_t val1,val2; // Values of the observable to be tested upon
1074 for (Int_t i=0; i<njets; i++) // Loop over all jets of the array
1076 AliJet* jx=(AliJet*)jets->At(i);
1080 if (nord == 0) // store the first jet at the first ordered position
1083 fSelected->AddAt(jx,nord-1);
1087 for (Int_t j=0; j<=nord; j++) // put jet in the right ordered position
1089 if (j == nord) // jet has smallest (mode<0) or largest (mode>0) observable value seen so far
1092 fSelected->AddAt(jx,j); // add jet at the end
1093 break; // go for next jet
1102 val1=jx->GetNtracks();
1103 val2=((AliJet*)fSelected->At(j))->GetNtracks();
1106 val1=jx->GetEnergy();
1107 val2=((AliJet*)fSelected->At(j))->GetEnergy();
1110 val1=jx->GetMomentum();
1111 val2=((AliJet*)fSelected->At(j))->GetMomentum();
1114 val1=jx->GetInvmass();
1115 val2=((AliJet*)fSelected->At(j))->GetInvmass();
1119 val2=((AliJet*)fSelected->At(j))->GetPt();
1123 val2=((AliJet*)fSelected->At(j))->GetPl();
1127 val2=((AliJet*)fSelected->At(j))->GetEt();
1131 val2=((AliJet*)fSelected->At(j))->GetEl();
1135 val2=((AliJet*)fSelected->At(j))->GetMt();
1138 val1=jx->GetRapidity();
1139 val2=((AliJet*)fSelected->At(j))->GetRapidity();
1142 val1=jx->GetPseudoRapidity();
1143 val2=((AliJet*)fSelected->At(j))->GetPseudoRapidity();
1147 if (mode<0 && val1 <= val2) continue;
1148 if (mode>0 && val1 >= val2) continue;
1151 for (Int_t k=nord-1; k>j; k--) // create empty position
1153 fSelected->AddAt(fSelected->At(k-1),k);
1155 fSelected->AddAt(jx,j); // put jet at empty position
1156 break; // go for next jet
1161 ///////////////////////////////////////////////////////////////////////////
1162 TObject* AliVertex::Clone(const char* name) const
1164 // Make a deep copy of the current object and provide the pointer to the copy.
1165 // This memberfunction enables automatic creation of new objects of the
1166 // correct type depending on the object type, a feature which may be very useful
1167 // for containers when adding objects in case the container owns the objects.
1168 // This feature allows e.g. AliEvent to store either AliVertex objects or
1169 // objects derived from AliVertex via the AddVertex memberfunction, provided
1170 // these derived classes also have a proper Clone memberfunction.
1172 AliVertex* vtx=new AliVertex(*this);
1175 if (strlen(name)) vtx->SetName(name);
1179 ///////////////////////////////////////////////////////////////////////////