1 // Author: Uli Frankenfeld <mailto:franken@fi.uib.no>
2 //*-- Copyright © Uli
4 #include "AliL3Logging.h"
7 #include "AliL3VertexArray.h"
10 //_____________________________________________________________
13 // The L3 Fast Vertex Finder Base Class
17 //for(Int_t sec=0;sec<NSEC;sec++){
19 // FillSectorSeed3D(x,y,z);
20 // FillSector3D(x,y,z);
21 // FindSectorVertex();
22 // Double_t z = GetZSector();
23 // Double_t zerr = GetZSectorErr();
24 //// do somethink with z, zerr
27 ClassImp(AliL3VertexArray)
28 void AliL3VertexArray::AnalyzeSector(Float_t *vertex, Int_t *array, Int_t len){
29 //loop over all seeds and all vertex position
30 LOG(AliL3Log::kInformational,"AliL3VertexArray::AnalyzeSector","Analyze")
31 <<AliL3Log::kDec<<"Number of Seeds: "<<fNSeed<<ENDLOG;
32 for(Int_t i =0;i<fNSeed;i++)
33 for(Int_t bin = 0;bin<len;bin++)
34 array[bin] += Trace(fZSeed[i],fRSeed[i],fSecSeed[i],vertex[bin]);
37 void AliL3VertexArray::FindSectorVertex(Double_t pos, Double_t range, Int_t nbin){
38 //define position and range for search and
40 //and find position of vertex and error
41 const Int_t len = nbin;
42 const Double_t width = range;
43 const Double_t xmin = pos - width/2;
44 const Double_t step = width/len;
45 const Double_t start = xmin + step/2.;
46 Int_t * array = new Int_t[len];
47 Float_t * ver = new Float_t[len];
48 for(Int_t i=0;i<len;i++){
49 ver[i] = start + step * i;
52 AnalyzeSector(ver,array,len);
53 FindMean(ver,array,len);
58 void AliL3VertexArray::FindMean(Float_t *vertex,Int_t *array, Int_t len){
59 //find mean and error of array and store it in
60 //fZSector and fZSectorErr
61 const Int_t nbin = len;
64 for(Int_t i = 0;i<nbin;i++){
75 if(xmin<0) {ops++;break;}
76 if(array[xmin]<hmax) {
82 if(xmax>=nbin) {ops++;break;}
88 if(xbin >= nbin/2){xmin = 2 * xbin - nbin +1;xmax = nbin-1;}
89 else{xmin = 0;xmax = 2 * xbin;}
95 for(Int_t bin = xmin;bin<=xmax;bin++){
97 sumw2 += array[bin] * array[bin];
98 sumwx += array[bin] * vertex[bin];
99 sumwx2 += array[bin] * vertex[bin] * vertex[bin];
102 Double_t mean = sumwx/sumw;
103 Double_t rms2 = fabs(sumwx2/sumw - mean*mean);
104 fZSectorErr = sqrt(rms2/sumw);
107 else{fZSectorErr = fZSector = 0;}
108 sumw=sumw2=sumwx=sumwx2=0;
109 for(Int_t bin = 0;bin<nbin;bin++){
111 sumw2 += array[bin] * array[bin];
112 sumwx += array[bin] * vertex[bin];
113 sumwx2 += array[bin] * vertex[bin] * vertex[bin];
116 Double_t mean = fZSector;
117 Double_t rms2 = fabs(sumwx2/sumw - mean*mean);
118 fZSectorErr = sqrt(rms2/sumw);