From: masera <masera@f7af4fe6-9843-0410-8265-dc069ae4e863>
Date: Tue, 17 Feb 2004 14:15:33 +0000 (+0000)
Subject: Example for vertex finder starting from reconstructed tracks
X-Git-Url: http://git.uio.no/git/?p=u%2Fmrichter%2FAliRoot.git;a=commitdiff_plain;h=314e387cebd049d01732cd14685cd15b2be6a878

Example for vertex finder starting from reconstructed tracks
---

diff --git a/ITS/AliITSVertexerTracksTest.C b/ITS/AliITSVertexerTracksTest.C
new file mode 100644
index 00000000000..e502a0b18f9
--- /dev/null
+++ b/ITS/AliITSVertexerTracksTest.C
@@ -0,0 +1,146 @@
+#if !defined(__CINT__) || defined(__MAKECINT__)
+//-- --- standard headers------------- 
+#include <Riostream.h>
+//--------Root headers ---------------
+#include <TSystem.h>
+#include <TFile.h>
+#include <TStopwatch.h>
+#include <TObject.h>
+#include <TTree.h>
+#include <TStopwatch.h>
+#include <TKey.h>
+//----- AliRoot headers ---------------
+#include "alles.h"
+#include "AliRun.h"
+#include "AliRunLoader.h"
+#include "AliMagF.h"
+#include "AliKalmanTrack.h"
+#include "AliITSVertex.h"
+#include "AliITSVertexer.h"
+#include "AliITSVertexerTracks.h"
+//-------------------------------------
+#endif
+void AliITSVertexerTracksTest(Int_t evFirst=0,Int_t evLast=0,Bool_t esd=kTRUE,
+			      const Char_t *galiceName="galice.root",
+			      const Char_t *inName="AliESDs.root",
+                              const Char_t *outName="AliESDs.root") {
+  /*******************************************************************
+   *                                                                 *
+   * Test macro for vertexing in pp using tracks.                    *
+   * If(esd) {                                                       *
+   *   Input file must contain ESD events with tracks reco in ITS    *
+   *   if output file = input file, vertices will be stored in the   *
+   *   ESD events and these rewritten to the same file; otherwise    *
+   *   they will be written to a new file                            *
+   * } else {                                                        *
+   *   input file must contain a tree with AliITStracksV2 and        *
+   *   can be written to the same file (output file = input file)    *
+   *   or to a new one                                               *
+   * }                                                               *
+   * If file galice.root is present field will be read from it       *
+   * otherwise it can be set here "by hand".                         *
+   *                                                                 *
+   * Origin: A.Dainese, Padova  andrea.dainese@pd.infn.it            *
+   *******************************************************************/     
+
+  TStopwatch timer;
+  timer.Start();
+
+  // Look for field value in galice.root
+  Double_t field = 0.4;
+  if(!gSystem->AccessPathName(galiceName,kFileExists)) {
+    AliRunLoader *rl = AliRunLoader::Open(galiceName);
+    rl->LoadgAlice();
+    AliMagF *fiel = (AliMagF*)gAlice->Field();
+    field=(Double_t)fiel->SolenoidField()/10.;
+    AliKalmanTrack::SetConvConst(100/0.299792458/field);
+    printf(" B = %3.1f read from gAlice and set\n",field);
+  } else {
+    printf(" File galice.root not found: default 0.4 T being used!\n");
+  }
+
+  // Open input and output files
+  TFile *inFile  = TFile::Open(inName);
+  TFile *outFile = TFile::Open(outName,"update");
+
+  // Create vertexer
+  AliITSVertexerTracks *vertexer = 
+    new AliITSVertexerTracks(inFile,outFile,field,evFirst,evLast);
+  // Find vertices
+  if(esd) {
+    vertexer->FindVerticesESD();
+  } else {
+    vertexer->FindVertices();
+  }
+
+  timer.Stop(); timer.Print();
+
+  delete vertexer;
+
+  inFile->Close();
+  outFile->Close();
+  delete inFile;
+  delete outFile;
+
+  return;
+}
+//----------------------------------------------------------------------------
+void VertexRecoInESDChain() {
+
+  TStopwatch timer;
+  timer.Start();
+
+  // Look for field value in galice.root
+  Double_t field = 0.4;
+  if(!gSystem->AccessPathName("galice.root",kFileExists)) {
+    AliRunLoader *rl = AliRunLoader::Open("galice.root");
+    rl->LoadgAlice();
+    AliMagF *fiel = (AliMagF*)gAlice->Field();
+    field=(Double_t)fiel->SolenoidField()/10.;
+    AliKalmanTrack::SetConvConst(100/0.299792458/field);
+    printf(" B = %3.1f read from gAlice and set\n",field);
+  } else {
+    printf(" File galice.root not found: default 0.4 T being used!\n");
+  }
+
+  // open file with ESD events (this would not be necessary in the chain...)
+  if(gSystem->AccessPathName("AliESDs.root",kFileExists))
+    { printf(" ESD file not found!\n"); return; }
+  TFile *esdFile = new TFile("AliESDs.root","update");
+ 
+  AliITSVertexerTracks *vertexer = new AliITSVertexerTracks();
+  vertexer->SetField(field);
+
+  Int_t n=0;
+  TKey *key=0;
+  TIter next(esdFile->GetListOfKeys());
+
+  //******* The loop over events
+  while ((key=(TKey*)next())!=0) {
+    printf("--- Processing event number : %d",n++);
+
+    AliESD *event=(AliESD*)key->ReadObj();
+
+    // find vertex and store it in the ESD (only pos and cov matrix)
+    vertexer->FindVertexForCurrentEvent(event);
+
+    // write event on file
+    event->Write();
+
+  }
+
+  timer.Stop(); timer.Print();
+
+  delete vertexer;
+  esdFile->Close();
+  delete esdFile;
+
+  return;
+}
+
+
+
+
+
+
+