X-Git-Url: http://git.uio.no/git/?a=blobdiff_plain;f=STEER%2FAliMagWrapCheb.cxx;h=6b364ba26c64798f728e7aa9b1a9c3dba483e7de;hb=583e63b8cc5bcb315a36593ccc48f486c2907bbf;hp=0bb238b4a909cb9b9ac4cd8bb1b1d37a342c56e0;hpb=a1dde21020b0dc42bab2b0623e252f283924514b;p=u%2Fmrichter%2FAliRoot.git

diff --git a/STEER/AliMagWrapCheb.cxx b/STEER/AliMagWrapCheb.cxx
index 0bb238b4a90..6b364ba26c6 100644
--- a/STEER/AliMagWrapCheb.cxx
+++ b/STEER/AliMagWrapCheb.cxx
@@ -13,106 +13,1137 @@
  * provided "as is" without express or implied warranty.                  *
  **************************************************************************/
 
-
-#include <TClass.h>
-#include <TFile.h>
-#include <TSystem.h>
-
 #include "AliMagWrapCheb.h"
 #include "AliLog.h"
+#include <TSystem.h>
+#include <TArrayF.h>
+#include <TArrayI.h>
 
 ClassImp(AliMagWrapCheb)
-    
 
-//_______________________________________________________________________
-AliMagWrapCheb::AliMagWrapCheb():
-  AliMagF(),
-  fMeasuredMap(0)
+//__________________________________________________________________________________________
+AliMagWrapCheb::AliMagWrapCheb() : 
+fNParamsSol(0),fNZSegSol(0),fNPSegSol(0),fNRSegSol(0),
+  fSegZSol(0),fSegPSol(0),fSegRSol(0),
+  fBegSegPSol(0),fNSegPSol(0),fBegSegRSol(0),fNSegRSol(0),fSegIDSol(0),fMinZSol(1.e6),fMaxZSol(-1.e6),fParamsSol(0),fMaxRSol(0),
+//
+  fNParamsTPC(0),fNZSegTPC(0),fNPSegTPC(0),fNRSegTPC(0),
+  fSegZTPC(0),fSegPTPC(0),fSegRTPC(0),
+  fBegSegPTPC(0),fNSegPTPC(0),fBegSegRTPC(0),fNSegRTPC(0),fSegIDTPC(0),fMinZTPC(1.e6),fMaxZTPC(-1.e6),fParamsTPC(0),fMaxRTPC(0),
+//
+  fNParamsTPCRat(0),fNZSegTPCRat(0),fNPSegTPCRat(0),fNRSegTPCRat(0),
+  fSegZTPCRat(0),fSegPTPCRat(0),fSegRTPCRat(0),
+  fBegSegPTPCRat(0),fNSegPTPCRat(0),fBegSegRTPCRat(0),fNSegRTPCRat(0),fSegIDTPCRat(0),fMinZTPCRat(1.e6),fMaxZTPCRat(-1.e6),fParamsTPCRat(0),fMaxRTPCRat(0),
+//
+  fNParamsDip(0),fNZSegDip(0),fNYSegDip(0),fNXSegDip(0),
+  fSegZDip(0),fSegYDip(0),fSegXDip(0),
+  fBegSegYDip(0),fNSegYDip(0),fBegSegXDip(0),fNSegXDip(0),fSegIDDip(0),fMinZDip(1.e6),fMaxZDip(-1.e6),fParamsDip(0)
+//
+{
+  // default constructor
+}
+
+//__________________________________________________________________________________________
+AliMagWrapCheb::AliMagWrapCheb(const AliMagWrapCheb& src) : 
+  TNamed(src),
+  fNParamsSol(0),fNZSegSol(0),fNPSegSol(0),fNRSegSol(0),
+  fSegZSol(0),fSegPSol(0),fSegRSol(0),
+  fBegSegPSol(0),fNSegPSol(0),fBegSegRSol(0),fNSegRSol(0),fSegIDSol(0),fMinZSol(1.e6),fMaxZSol(-1.e6),fParamsSol(0),fMaxRSol(0),
+//
+  fNParamsTPC(0),fNZSegTPC(0),fNPSegTPC(0),fNRSegTPC(0),
+  fSegZTPC(0),fSegPTPC(0),fSegRTPC(0),
+  fBegSegPTPC(0),fNSegPTPC(0),fBegSegRTPC(0),fNSegRTPC(0),fSegIDTPC(0),fMinZTPC(1.e6),fMaxZTPC(-1.e6),fParamsTPC(0),fMaxRTPC(0),
+//
+  fNParamsTPCRat(0),fNZSegTPCRat(0),fNPSegTPCRat(0),fNRSegTPCRat(0),
+  fSegZTPCRat(0),fSegPTPCRat(0),fSegRTPCRat(0),
+  fBegSegPTPCRat(0),fNSegPTPCRat(0),fBegSegRTPCRat(0),fNSegRTPCRat(0),fSegIDTPCRat(0),fMinZTPCRat(1.e6),fMaxZTPCRat(-1.e6),fParamsTPCRat(0),fMaxRTPCRat(0),
+//
+  fNParamsDip(0),fNZSegDip(0),fNYSegDip(0),fNXSegDip(0),
+  fSegZDip(0),fSegYDip(0),fSegXDip(0),
+  fBegSegYDip(0),fNSegYDip(0),fBegSegXDip(0),fNSegXDip(0),fSegIDDip(0),fMinZDip(1.e6),fMaxZDip(-1.e6),fParamsDip(0)
+{
+  // copy constructor
+  CopyFrom(src);
+}
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::CopyFrom(const AliMagWrapCheb& src) 
+{ 
+  // copy method
+  Clear();
+  SetName(src.GetName());
+  SetTitle(src.GetTitle());
+  //
+  fNParamsSol    = src.fNParamsSol;
+  fNZSegSol      = src.fNZSegSol;
+  fNPSegSol      = src.fNPSegSol;
+  fNRSegSol      = src.fNRSegSol;  
+  fMinZSol       = src.fMinZSol;
+  fMaxZSol       = src.fMaxZSol;
+  fMaxRSol       = src.fMaxRSol;
+  if (src.fNParamsSol) {
+    memcpy(fSegZSol   = new Float_t[fNZSegSol], src.fSegZSol, sizeof(Float_t)*fNZSegSol);
+    memcpy(fSegPSol   = new Float_t[fNPSegSol], src.fSegPSol, sizeof(Float_t)*fNPSegSol);
+    memcpy(fSegRSol   = new Float_t[fNRSegSol], src.fSegRSol, sizeof(Float_t)*fNRSegSol);
+    memcpy(fBegSegPSol= new Int_t[fNZSegSol], src.fBegSegPSol, sizeof(Int_t)*fNZSegSol);
+    memcpy(fNSegPSol  = new Int_t[fNZSegSol], src.fNSegPSol, sizeof(Int_t)*fNZSegSol);
+    memcpy(fBegSegRSol= new Int_t[fNPSegSol], src.fBegSegRSol, sizeof(Int_t)*fNPSegSol);
+    memcpy(fNSegRSol  = new Int_t[fNPSegSol], src.fNSegRSol, sizeof(Int_t)*fNPSegSol);
+    memcpy(fSegIDSol  = new Int_t[fNRSegSol], src.fSegIDSol, sizeof(Int_t)*fNRSegSol);
+    fParamsSol        = new TObjArray(fNParamsSol);
+    for (int i=0;i<fNParamsSol;i++) fParamsSol->AddAtAndExpand(new AliCheb3D(*src.GetParamSol(i)),i);
+  }
+  //
+  fNParamsTPC    = src.fNParamsTPC;
+  fNZSegTPC      = src.fNZSegTPC;
+  fNPSegTPC      = src.fNPSegTPC;
+  fNRSegTPC      = src.fNRSegTPC;  
+  fMinZTPC       = src.fMinZTPC;
+  fMaxZTPC       = src.fMaxZTPC;
+  fMaxRTPC       = src.fMaxRTPC;
+  if (src.fNParamsTPC) {
+    memcpy(fSegZTPC   = new Float_t[fNZSegTPC], src.fSegZTPC, sizeof(Float_t)*fNZSegTPC);
+    memcpy(fSegPTPC   = new Float_t[fNPSegTPC], src.fSegPTPC, sizeof(Float_t)*fNPSegTPC);
+    memcpy(fSegRTPC   = new Float_t[fNRSegTPC], src.fSegRTPC, sizeof(Float_t)*fNRSegTPC);
+    memcpy(fBegSegPTPC= new Int_t[fNZSegTPC], src.fBegSegPTPC, sizeof(Int_t)*fNZSegTPC);
+    memcpy(fNSegPTPC  = new Int_t[fNZSegTPC], src.fNSegPTPC, sizeof(Int_t)*fNZSegTPC);
+    memcpy(fBegSegRTPC= new Int_t[fNPSegTPC], src.fBegSegRTPC, sizeof(Int_t)*fNPSegTPC);
+    memcpy(fNSegRTPC  = new Int_t[fNPSegTPC], src.fNSegRTPC, sizeof(Int_t)*fNPSegTPC);
+    memcpy(fSegIDTPC  = new Int_t[fNRSegTPC], src.fSegIDTPC, sizeof(Int_t)*fNRSegTPC);
+    fParamsTPC        = new TObjArray(fNParamsTPC);
+    for (int i=0;i<fNParamsTPC;i++) fParamsTPC->AddAtAndExpand(new AliCheb3D(*src.GetParamTPCInt(i)),i);
+  }
+  //
+  fNParamsTPCRat    = src.fNParamsTPCRat;
+  fNZSegTPCRat      = src.fNZSegTPCRat;
+  fNPSegTPCRat      = src.fNPSegTPCRat;
+  fNRSegTPCRat      = src.fNRSegTPCRat;  
+  fMinZTPCRat       = src.fMinZTPCRat;
+  fMaxZTPCRat       = src.fMaxZTPCRat;
+  fMaxRTPCRat       = src.fMaxRTPCRat;
+  if (src.fNParamsTPCRat) {
+    memcpy(fSegZTPCRat   = new Float_t[fNZSegTPCRat], src.fSegZTPCRat, sizeof(Float_t)*fNZSegTPCRat);
+    memcpy(fSegPTPCRat   = new Float_t[fNPSegTPCRat], src.fSegPTPCRat, sizeof(Float_t)*fNPSegTPCRat);
+    memcpy(fSegRTPCRat   = new Float_t[fNRSegTPCRat], src.fSegRTPCRat, sizeof(Float_t)*fNRSegTPCRat);
+    memcpy(fBegSegPTPCRat= new Int_t[fNZSegTPCRat], src.fBegSegPTPCRat, sizeof(Int_t)*fNZSegTPCRat);
+    memcpy(fNSegPTPCRat  = new Int_t[fNZSegTPCRat], src.fNSegPTPCRat, sizeof(Int_t)*fNZSegTPCRat);
+    memcpy(fBegSegRTPCRat= new Int_t[fNPSegTPCRat], src.fBegSegRTPCRat, sizeof(Int_t)*fNPSegTPCRat);
+    memcpy(fNSegRTPCRat  = new Int_t[fNPSegTPCRat], src.fNSegRTPCRat, sizeof(Int_t)*fNPSegTPCRat);
+    memcpy(fSegIDTPCRat  = new Int_t[fNRSegTPCRat], src.fSegIDTPCRat, sizeof(Int_t)*fNRSegTPCRat);
+    fParamsTPCRat        = new TObjArray(fNParamsTPCRat);
+    for (int i=0;i<fNParamsTPCRat;i++) fParamsTPCRat->AddAtAndExpand(new AliCheb3D(*src.GetParamTPCRatInt(i)),i);
+  }
+  //
+  fNParamsDip    = src.fNParamsDip;
+  fNZSegDip      = src.fNZSegDip;
+  fNYSegDip      = src.fNYSegDip;
+  fNXSegDip      = src.fNXSegDip;  
+  fMinZDip       = src.fMinZDip;
+  fMaxZDip       = src.fMaxZDip;
+  if (src.fNParamsDip) {
+    memcpy(fSegZDip   = new Float_t[fNZSegDip], src.fSegZDip, sizeof(Float_t)*fNZSegDip);
+    memcpy(fSegYDip   = new Float_t[fNYSegDip], src.fSegYDip, sizeof(Float_t)*fNYSegDip);
+    memcpy(fSegXDip   = new Float_t[fNXSegDip], src.fSegXDip, sizeof(Float_t)*fNXSegDip);
+    memcpy(fBegSegYDip= new Int_t[fNZSegDip], src.fBegSegYDip, sizeof(Int_t)*fNZSegDip);
+    memcpy(fNSegYDip  = new Int_t[fNZSegDip], src.fNSegYDip, sizeof(Int_t)*fNZSegDip);
+    memcpy(fBegSegXDip= new Int_t[fNYSegDip], src.fBegSegXDip, sizeof(Int_t)*fNYSegDip);
+    memcpy(fNSegXDip  = new Int_t[fNYSegDip], src.fNSegXDip, sizeof(Int_t)*fNYSegDip);
+    memcpy(fSegIDDip  = new Int_t[fNXSegDip], src.fSegIDDip, sizeof(Int_t)*fNXSegDip);
+    fParamsDip        = new TObjArray(fNParamsDip);
+    for (int i=0;i<fNParamsDip;i++) fParamsDip->AddAtAndExpand(new AliCheb3D(*src.GetParamDip(i)),i);
+  }
+  //
+}
+
+//__________________________________________________________________________________________
+AliMagWrapCheb& AliMagWrapCheb::operator=(const AliMagWrapCheb& rhs)
+{
+  // assignment
+  if (this != &rhs) {  
+    Clear();
+    CopyFrom(rhs);
+  }
+  return *this;  
+  //
+}
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::Clear(const Option_t *)
+{
+  // clear all dynamic parts
+  if (fNParamsSol) {
+    delete   fParamsSol;  fParamsSol = 0;
+    delete[] fSegZSol;    fSegZSol   = 0;
+    delete[] fSegPSol;    fSegPSol   = 0;
+    delete[] fSegRSol;    fSegRSol   = 0;
+    delete[] fBegSegPSol; fBegSegPSol = 0;
+    delete[] fNSegPSol;   fNSegPSol   = 0;
+    delete[] fBegSegRSol; fBegSegRSol = 0;
+    delete[] fNSegRSol;   fNSegRSol   = 0;
+    delete[] fSegIDSol;   fSegIDSol   = 0;   
+  }
+  fNParamsSol = fNZSegSol = fNPSegSol = fNRSegSol = 0;
+  fMinZSol = 1e6;
+  fMaxZSol = -1e6;
+  fMaxRSol = 0;
+  //
+  if (fNParamsTPC) {
+    delete   fParamsTPC;  fParamsTPC = 0;
+    delete[] fSegZTPC;    fSegZTPC   = 0;
+    delete[] fSegPTPC;    fSegPTPC   = 0;
+    delete[] fSegRTPC;    fSegRTPC   = 0;
+    delete[] fBegSegPTPC; fBegSegPTPC = 0;
+    delete[] fNSegPTPC;   fNSegPTPC   = 0;
+    delete[] fBegSegRTPC; fBegSegRTPC = 0;
+    delete[] fNSegRTPC;   fNSegRTPC   = 0;
+    delete[] fSegIDTPC;   fSegIDTPC   = 0;   
+  }
+  fNParamsTPC = fNZSegTPC = fNPSegTPC = fNRSegTPC = 0;
+  fMinZTPC = 1e6;
+  fMaxZTPC = -1e6;
+  fMaxRTPC = 0;
+  //
+  if (fNParamsTPCRat) {
+    delete   fParamsTPCRat;  fParamsTPCRat = 0;
+    delete[] fSegZTPCRat;    fSegZTPCRat   = 0;
+    delete[] fSegPTPCRat;    fSegPTPCRat   = 0;
+    delete[] fSegRTPCRat;    fSegRTPCRat   = 0;
+    delete[] fBegSegPTPCRat; fBegSegPTPCRat = 0;
+    delete[] fNSegPTPCRat;   fNSegPTPCRat   = 0;
+    delete[] fBegSegRTPCRat; fBegSegRTPCRat = 0;
+    delete[] fNSegRTPCRat;   fNSegRTPCRat   = 0;
+    delete[] fSegIDTPCRat;   fSegIDTPCRat   = 0;   
+  }
+  fNParamsTPCRat = fNZSegTPCRat = fNPSegTPCRat = fNRSegTPCRat = 0;
+  fMinZTPCRat = 1e6;
+  fMaxZTPCRat = -1e6;
+  fMaxRTPCRat = 0;
+  //
+  if (fNParamsDip) {
+    delete   fParamsDip;  fParamsDip = 0;
+    delete[] fSegZDip;    fSegZDip   = 0;
+    delete[] fSegYDip;    fSegYDip   = 0; 
+    delete[] fSegXDip;    fSegXDip   = 0;
+    delete[] fBegSegYDip; fBegSegYDip = 0;
+    delete[] fNSegYDip;   fNSegYDip   = 0;
+    delete[] fBegSegXDip; fBegSegXDip = 0; 
+    delete[] fNSegXDip;   fNSegXDip   = 0;
+    delete[] fSegIDDip;   fSegIDDip   = 0;
+  }
+  fNParamsDip = fNZSegDip = fNYSegDip = fNXSegDip = 0;
+  fMinZDip = 1e6;
+  fMaxZDip = -1e6;
+  //
+}
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::Field(const Double_t *xyz, Double_t *b) const
+{
+  // compute field in cartesian coordinates. If point is outside of the parameterized region
+  // get it at closest valid point
+  Double_t rphiz[3];
+  //
+#ifndef _BRING_TO_BOUNDARY_  // exact matching to fitted volume is requested
+  b[0] = b[1] = b[2] = 0;
+#endif
+  //
+  if (xyz[2]>fMinZSol) {
+    CartToCyl(xyz,rphiz);
+    FieldCylSol(rphiz,b);
+    // convert field to cartesian system
+    CylToCartCylB(rphiz, b,b);  
+    return;
+  }
+  //
+  int iddip = FindDipSegment(xyz);
+  if (iddip<0) return;
+  AliCheb3D* par = GetParamDip(iddip);
+#ifndef _BRING_TO_BOUNDARY_
+  if (!par->IsInside(xyz)) return;
+#endif
+  par->Eval(xyz,b); 
+  //
+}
+
+//__________________________________________________________________________________________
+Double_t AliMagWrapCheb::GetBz(const Double_t *xyz) const
+{
+  // compute Bz for the point in cartesian coordinates. If point is outside of the parameterized region
+  // get it at closest valid point
+  Double_t rphiz[3];
+  //
+  if (xyz[2]>fMinZSol) {
+    CartToCyl(xyz,rphiz);
+    return FieldCylSolBz(rphiz);
+  }
+  //
+  int iddip = FindDipSegment(xyz);
+  if (iddip<0) return 0.;
+  AliCheb3D* par = GetParamDip(iddip);
+#ifndef _BRING_TO_BOUNDARY_
+  if (!par->IsInside(xyz)) return 0.;
+#endif
+  return par->Eval(xyz,2);
+}
+
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::Print(Option_t *) const
+{
+  // print info
+  printf("Alice magnetic field parameterized by Chebyshev polynomials\n");
+  printf("Segmentation for Solenoid (%+.2f<Z<%+.2f cm | R<%.2f cm)\n",fMinZSol,fMaxZSol,fMaxRSol);
+  //
+  if (fParamsSol) {
+    for (int i=0;i<fNParamsSol;i++) {
+      printf("SOL%4d ",i);
+      GetParamSol(i)->Print();
+    }
+  }
+  //
+  printf("Segmentation for TPC field integral (%+.2f<Z<%+.2f cm | R<%.2f cm)\n",fMinZTPC,fMaxZTPC,fMaxRTPC);
+  //
+  if (fParamsTPC) {
+    for (int i=0;i<fNParamsTPC;i++) {
+      printf("TPC%4d ",i);
+      GetParamTPCInt(i)->Print();
+    }
+  }
+  //
+  printf("Segmentation for TPC field ratios integral (%+.2f<Z<%+.2f cm | R<%.2f cm)\n",fMinZTPCRat,fMaxZTPCRat,fMaxRTPCRat);
+  //
+  if (fParamsTPCRat) {
+    for (int i=0;i<fNParamsTPCRat;i++) {
+      printf("TPCRat%4d ",i);
+      GetParamTPCRatInt(i)->Print();
+    }
+  }
+  //
+  printf("Segmentation for Dipole (%+.2f<Z<%+.2f cm)\n",fMinZDip,fMaxZDip);
+  if (fParamsDip) {
+    for (int i=0;i<fNParamsDip;i++) {
+      printf("DIP%4d ",i);
+      GetParamDip(i)->Print();
+    }
+  }
+  //
+}
+
+//__________________________________________________________________________________________________
+Int_t AliMagWrapCheb::FindDipSegment(const Double_t *xyz) const 
+{
+  // find the segment containing point xyz. If it is outside find the closest segment 
+  if (!fNParamsDip) return -1;
+  int xid,yid,zid = TMath::BinarySearch(fNZSegDip,fSegZDip,(Float_t)xyz[2]); // find zsegment
+  //
+  Bool_t reCheck = kFALSE;
+  while(1) {
+    int ysegBeg = fBegSegYDip[zid];
+    //
+    for (yid=0;yid<fNSegYDip[zid];yid++) if (xyz[1]<fSegYDip[ysegBeg+yid]) break;
+    if ( --yid < 0 ) yid = 0;
+    yid +=  ysegBeg;
+    //
+    int xsegBeg = fBegSegXDip[yid];
+    for (xid=0;xid<fNSegXDip[yid];xid++) if (xyz[0]<fSegXDip[xsegBeg+xid]) break;
+    //
+    if ( --xid < 0) xid = 0;
+    xid +=  xsegBeg;
+    //
+    // to make sure that due to the precision problems we did not pick the next Zbin    
+    if (!reCheck && (xyz[2] - fSegZDip[zid] < 3.e-5) && zid &&
+	!GetParamDip(fSegIDDip[xid])->IsInside(xyz)) {  // check the previous Z bin
+      zid--;
+      reCheck = kTRUE;
+      continue;
+    } 
+    break;
+  }
+  return fSegIDDip[xid];
+}
+
+//__________________________________________________________________________________________________
+Int_t AliMagWrapCheb::FindSolSegment(const Double_t *rpz) const 
+{
+  // find the segment containing point xyz. If it is outside find the closest segment 
+  if (!fNParamsSol) return -1;
+  int rid,pid,zid = TMath::BinarySearch(fNZSegSol,fSegZSol,(Float_t)rpz[2]); // find zsegment
+  //
+  Bool_t reCheck = kFALSE;
+  while(1) {
+    int psegBeg = fBegSegPSol[zid];
+    for (pid=0;pid<fNSegPSol[zid];pid++) if (rpz[1]<fSegPSol[psegBeg+pid]) break;
+    if ( --pid < 0 ) pid = 0;
+    pid +=  psegBeg;
+    //
+    int rsegBeg = fBegSegRSol[pid];
+    for (rid=0;rid<fNSegRSol[pid];rid++) if (rpz[0]<fSegRSol[rsegBeg+rid]) break;
+    if ( --rid < 0) rid = 0;
+    rid +=  rsegBeg;
+    //
+    // to make sure that due to the precision problems we did not pick the next Zbin    
+    if (!reCheck && (rpz[2] - fSegZSol[zid] < 3.e-5) && zid &&
+	!GetParamSol(fSegIDSol[rid])->IsInside(rpz)) {  // check the previous Z bin
+      zid--;
+      reCheck = kTRUE;
+      continue;
+    } 
+    break;
+  }
+  return fSegIDSol[rid];
+}
+
+//__________________________________________________________________________________________________
+Int_t AliMagWrapCheb::FindTPCSegment(const Double_t *rpz) const 
 {
-  // Default constructor
+  // find the segment containing point xyz. If it is outside find the closest segment 
+  if (!fNParamsTPC) return -1;
+  int rid,pid,zid = TMath::BinarySearch(fNZSegTPC,fSegZTPC,(Float_t)rpz[2]); // find zsegment
   //
+  Bool_t reCheck = kFALSE;
+  while(1) {
+    int psegBeg = fBegSegPTPC[zid];
+    //
+    for (pid=0;pid<fNSegPTPC[zid];pid++) if (rpz[1]<fSegPTPC[psegBeg+pid]) break;
+    if ( --pid < 0 ) pid = 0;
+    pid +=  psegBeg;
+    //
+    int rsegBeg = fBegSegRTPC[pid];
+    for (rid=0;rid<fNSegRTPC[pid];rid++) if (rpz[0]<fSegRTPC[rsegBeg+rid]) break;
+    if ( --rid < 0) rid = 0;
+    rid +=  rsegBeg;
+    //
+    // to make sure that due to the precision problems we did not pick the next Zbin    
+    if (!reCheck && (rpz[2] - fSegZTPC[zid] < 3.e-5) && zid &&
+	!GetParamTPCInt(fSegIDTPC[rid])->IsInside(rpz)) {  // check the previous Z bin
+      zid--;
+      reCheck = kTRUE;
+      continue;
+    } 
+    break;
+  }
+  return fSegIDTPC[rid];
 }
 
-//_______________________________________________________________________
-AliMagWrapCheb::AliMagWrapCheb(const char *name, const char *title, Int_t integ, 
-			       Float_t factor, Float_t fmax, Int_t map, 
-			       Bool_t dipoleON,const char* path):
-  AliMagF(name, title, integ, factor, fmax),
-  fMeasuredMap(0)
+//__________________________________________________________________________________________________
+Int_t AliMagWrapCheb::FindTPCRatSegment(const Double_t *rpz) const 
 {
+  // find the segment containing point xyz. If it is outside find the closest segment 
+  if (!fNParamsTPCRat) return -1;
+  int rid,pid,zid = TMath::BinarySearch(fNZSegTPCRat,fSegZTPCRat,(Float_t)rpz[2]); // find zsegment
   //
-  fMap = map;
-  char* fname = gSystem->ExpandPathName(path);
-  TFile* file = TFile::Open(fname);
-  if (!file) {
-    AliError(Form("Failed to open magnetic field data file %s\n",fname)); 
+  Bool_t reCheck = kFALSE;
+  while(1) {
+    int psegBeg = fBegSegPTPCRat[zid];
+    //
+    for (pid=0;pid<fNSegPTPCRat[zid];pid++) if (rpz[1]<fSegPTPCRat[psegBeg+pid]) break;
+    if ( --pid < 0 ) pid = 0;
+    pid +=  psegBeg;
+    //
+    int rsegBeg = fBegSegRTPCRat[pid];
+    for (rid=0;rid<fNSegRTPCRat[pid];rid++) if (rpz[0]<fSegRTPCRat[rsegBeg+rid]) break;
+    if ( --rid < 0) rid = 0;
+    rid +=  rsegBeg;
+    //
+    // to make sure that due to the precision problems we did not pick the next Zbin    
+    if (!reCheck && (rpz[2] - fSegZTPCRat[zid] < 3.e-5) && zid &&
+	!GetParamTPCRatInt(fSegIDTPCRat[rid])->IsInside(rpz)) {  // check the previous Z bin
+      zid--;
+      reCheck = kTRUE;
+      continue;
+    } 
+    break;
+  }
+  return fSegIDTPCRat[rid];
+}
+
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::GetTPCInt(const Double_t *xyz, Double_t *b) const
+{
+  // compute TPC region field integral in cartesian coordinates.
+  // If point is outside of the parameterized region get it at closeset valid point
+  static Double_t rphiz[3];
+  //
+  // TPCInt region
+  // convert coordinates to cyl system
+  CartToCyl(xyz,rphiz);
+#ifndef _BRING_TO_BOUNDARY_
+  if ( (rphiz[2]>GetMaxZTPCInt()||rphiz[2]<GetMinZTPCInt()) ||
+       rphiz[0]>GetMaxRTPCInt()) {for (int i=3;i--;) b[i]=0; return;}
+#endif
+  //
+  GetTPCIntCyl(rphiz,b);
+  //
+  // convert field to cartesian system
+  CylToCartCylB(rphiz, b,b);
+  //
+}
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::GetTPCRatInt(const Double_t *xyz, Double_t *b) const
+{
+  // compute TPCRat region field integral in cartesian coordinates.
+  // If point is outside of the parameterized region get it at closeset valid point
+  static Double_t rphiz[3];
+  //
+  // TPCRatInt region
+  // convert coordinates to cyl system
+  CartToCyl(xyz,rphiz);
+#ifndef _BRING_TO_BOUNDARY_
+  if ( (rphiz[2]>GetMaxZTPCRatInt()||rphiz[2]<GetMinZTPCRatInt()) ||
+       rphiz[0]>GetMaxRTPCRatInt()) {for (int i=3;i--;) b[i]=0; return;}
+#endif
+  //
+  GetTPCRatIntCyl(rphiz,b);
+  //
+  // convert field to cartesian system
+  CylToCartCylB(rphiz, b,b);
+  //
+}
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::FieldCylSol(const Double_t *rphiz, Double_t *b) const
+{
+  // compute Solenoid field in Cylindircal coordinates
+  // note: if the point is outside the volume get the field in closest parameterized point
+  int id = FindSolSegment(rphiz);
+  if (id<0) return;
+  AliCheb3D* par = GetParamSol(id);
+#ifndef _BRING_TO_BOUNDARY_  // exact matching to fitted volume is requested  
+  if (!par->IsInside(rphiz)) return;
+#endif
+  par->Eval(rphiz,b);
+  return;
+  //
+}
+
+//__________________________________________________________________________________________
+Double_t AliMagWrapCheb::FieldCylSolBz(const Double_t *rphiz) const
+{
+  // compute Solenoid field in Cylindircal coordinates
+  // note: if the point is outside the volume get the field in closest parameterized point
+  int id = FindSolSegment(rphiz);
+  if (id<0) return 0.;
+  AliCheb3D* par = GetParamSol(id);
+#ifndef _BRING_TO_BOUNDARY_  
+  return par->IsInside(rphiz) ? par->Eval(rphiz,2) : 0;
+#endif
+  return par->Eval(rphiz,2);
+  //
+}
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::GetTPCIntCyl(const Double_t *rphiz, Double_t *b) const
+{
+  // compute field integral in TPC region in Cylindircal coordinates
+  // note: the check for the point being inside the parameterized region is done outside
+  int id = FindTPCSegment(rphiz);
+  if (id<0) {
+    b[0] = b[1] = b[2] = 0;
+    return;
+  }
+  if (id>=fNParamsTPC) {
+    AliError(Form("Wrong TPCParam segment %d",id));
+    b[0] = b[1] = b[2] = 0;
     return;
   }
-  const char* parname = 0;
-  if      (fMap == k2kG) parname = dipoleON ? "Sol12_Dip6_Hole":"Sol12_Dip0_Hole";
-  else if (fMap == k5kG) parname = dipoleON ? "Sol30_Dip6_Hole":"Sol30_Dip0_Hole";
-  else {
-    AliError(Form("Unknown field identifier %d is requested\n",fMap)); 
+  AliCheb3D* par = GetParamTPCInt(id);
+  if (par->IsInside(rphiz)) {
+    par->Eval(rphiz,b); 
     return;
   }
+  b[0] = b[1] = b[2] = 0;
+  return;
   //
-  fMeasuredMap = dynamic_cast<AliMagFCheb*>(file->Get(parname));
-  if (!fMeasuredMap) {
-    AliError(Form("Did not find field %s in %s\n",parname,fname)); 
+}
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::GetTPCRatIntCyl(const Double_t *rphiz, Double_t *b) const
+{
+  // compute field integral in TPCRat region in Cylindircal coordinates
+  // note: the check for the point being inside the parameterized region is done outside
+  int id = FindTPCRatSegment(rphiz);
+  if (id<0) {
+    b[0] = b[1] = b[2] = 0;
     return;
   }
-  file->Close();
-  delete file;
+  if (id>=fNParamsTPCRat) {
+    AliError(Form("Wrong TPCRatParam segment %d",id));
+    b[0] = b[1] = b[2] = 0;
+    return;
+  }
+  AliCheb3D* par = GetParamTPCRatInt(id);
+  if (par->IsInside(rphiz)) {
+    par->Eval(rphiz,b); 
+    return;
+  }
+  b[0] = b[1] = b[2] = 0;
+  return;
+  //
 }
 
 
-//_______________________________________________________________________
-AliMagWrapCheb::AliMagWrapCheb(const AliMagWrapCheb &src):
-  AliMagF(src),
-  fMeasuredMap(0)
+#ifdef  _INC_CREATION_ALICHEB3D_
+//_______________________________________________
+void AliMagWrapCheb::LoadData(const char* inpfile)
 {
-  if (src.fMeasuredMap) fMeasuredMap = new AliMagFCheb(*src.fMeasuredMap);
+  // read coefficients data from the text file
+  //
+  TString strf = inpfile;
+  gSystem->ExpandPathName(strf);
+  FILE* stream = fopen(strf,"r");
+  if (!stream) {
+    printf("Did not find input file %s\n",strf.Data());
+    return;
+  }
+  //
+  TString buffs;
+  AliCheb3DCalc::ReadLine(buffs,stream);
+  if (!buffs.BeginsWith("START")) {
+    Error("LoadData","Expected: \"START <name>\", found \"%s\"\nStop\n",buffs.Data());
+    exit(1);
+  }
+  if (buffs.First(' ')>0) SetName(buffs.Data()+buffs.First(' ')+1);
+  //
+  // Solenoid part    -----------------------------------------------------------
+  AliCheb3DCalc::ReadLine(buffs,stream);
+  if (!buffs.BeginsWith("START SOLENOID")) {
+    Error("LoadData","Expected: \"START SOLENOID\", found \"%s\"\nStop\n",buffs.Data());
+    exit(1);
+  }
+  AliCheb3DCalc::ReadLine(buffs,stream); // nparam
+  int nparSol = buffs.Atoi(); 
+  //
+  for (int ip=0;ip<nparSol;ip++) {
+    AliCheb3D* cheb = new AliCheb3D();
+    cheb->LoadData(stream);
+    AddParamSol(cheb);
+  }
+  //
+  AliCheb3DCalc::ReadLine(buffs,stream);
+  if (!buffs.BeginsWith("END SOLENOID")) {
+    Error("LoadData","Expected \"END SOLENOID\", found \"%s\"\nStop\n",buffs.Data());
+    exit(1);
+  }
+  //
+  // TPCInt part     -----------------------------------------------------------
+  AliCheb3DCalc::ReadLine(buffs,stream);
+  if (!buffs.BeginsWith("START TPCINT")) {
+    Error("LoadData","Expected: \"START TPCINT\", found \"%s\"\nStop\n",buffs.Data());
+    exit(1);
+  }
+  AliCheb3DCalc::ReadLine(buffs,stream); // nparam
+  int nparTPCInt = buffs.Atoi(); 
+  //
+  for (int ip=0;ip<nparTPCInt;ip++) {
+    AliCheb3D* cheb = new AliCheb3D();
+    cheb->LoadData(stream);
+    AddParamTPCInt(cheb);
+  }
+  //
+  AliCheb3DCalc::ReadLine(buffs,stream);
+  if (!buffs.BeginsWith("END TPCINT")) {
+    Error("LoadData","Expected \"END TPCINT\", found \"%s\"\nStop\n",buffs.Data());
+    exit(1);
+  }
+  //
+  // TPCRatInt part     -----------------------------------------------------------
+  AliCheb3DCalc::ReadLine(buffs,stream);
+  if (!buffs.BeginsWith("START TPCRatINT")) {
+    Error("LoadData","Expected: \"START TPCRatINT\", found \"%s\"\nStop\n",buffs.Data());
+    exit(1);
+  }
+  AliCheb3DCalc::ReadLine(buffs,stream); // nparam
+  int nparTPCRatInt = buffs.Atoi(); 
+  //
+  for (int ip=0;ip<nparTPCRatInt;ip++) {
+    AliCheb3D* cheb = new AliCheb3D();
+    cheb->LoadData(stream);
+    AddParamTPCRatInt(cheb);
+  }
+  //
+  AliCheb3DCalc::ReadLine(buffs,stream);
+  if (!buffs.BeginsWith("END TPCRatINT")) {
+    Error("LoadData","Expected \"END TPCRatINT\", found \"%s\"\nStop\n",buffs.Data());
+    exit(1);
+  }
+  //
+  // Dipole part    -----------------------------------------------------------
+  AliCheb3DCalc::ReadLine(buffs,stream);
+  if (!buffs.BeginsWith("START DIPOLE")) {
+    Error("LoadData","Expected: \"START DIPOLE\", found \"%s\"\nStop\n",buffs.Data());
+    exit(1);
+  }
+  AliCheb3DCalc::ReadLine(buffs,stream); // nparam
+  int nparDip = buffs.Atoi();  
+  //
+  for (int ip=0;ip<nparDip;ip++) {
+    AliCheb3D* cheb = new AliCheb3D();
+    cheb->LoadData(stream);
+    AddParamDip(cheb);
+  }
+  //
+  AliCheb3DCalc::ReadLine(buffs,stream);
+  if (!buffs.BeginsWith("END DIPOLE")) {
+    Error("LoadData","Expected \"END DIPOLE\", found \"%s\"\nStop\n",GetName(),buffs.Data());
+    exit(1);
+  }
+  //
+  AliCheb3DCalc::ReadLine(buffs,stream);
+  if (!buffs.BeginsWith("END") || !buffs.Contains(GetName())) {
+    Error("LoadData","Expected: \"END %s\", found \"%s\"\nStop\n",GetName(),buffs.Data());
+    exit(1);
+  }
+  //
+  // ---------------------------------------------------------------------------
+  fclose(stream);
+  BuildTableSol();
+  BuildTableDip();
+  BuildTableTPCInt();
+  BuildTableTPCRatInt();
+  //
+  printf("Loaded magnetic field \"%s\" from %s\n",GetName(),strf.Data());
+  //
+}
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::BuildTableSol()
+{
+  BuildTable(fNParamsSol,fParamsSol,
+	     fNZSegSol,fNPSegSol,fNRSegSol,
+	     fMinZSol,fMaxZSol, 
+	     &fSegZSol,&fSegPSol,&fSegRSol,
+	     &fBegSegPSol,&fNSegPSol,
+	     &fBegSegRSol,&fNSegRSol, 
+	     &fSegIDSol);
 }
 
-//_______________________________________________________________________
-AliMagWrapCheb::~AliMagWrapCheb()
+//__________________________________________________________________________________________
+void AliMagWrapCheb::BuildTableDip()
 {
-  delete fMeasuredMap;
+  BuildTable(fNParamsDip,fParamsDip,
+	     fNZSegDip,fNYSegDip,fNXSegDip,
+	     fMinZDip,fMaxZDip, 
+	     &fSegZDip,&fSegYDip,&fSegXDip,
+	     &fBegSegYDip,&fNSegYDip,
+	     &fBegSegXDip,&fNSegXDip, 
+	     &fSegIDDip);
 }
 
-//_______________________________________________________________________
-void AliMagWrapCheb::GetTPCInt(Float_t *xyz, Float_t *b) const
+//__________________________________________________________________________________________
+void AliMagWrapCheb::BuildTableTPCInt()
 {
-  // Method to calculate the integral of magnetic integral from xyz to nearest cathode plane
+  BuildTable(fNParamsTPC,fParamsTPC,
+	     fNZSegTPC,fNPSegTPC,fNRSegTPC,
+	     fMinZTPC,fMaxZTPC, 
+	     &fSegZTPC,&fSegPTPC,&fSegRTPC,
+	     &fBegSegPTPC,&fNSegPTPC,
+	     &fBegSegRTPC,&fNSegRTPC, 
+	     &fSegIDTPC);
+}
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::BuildTableTPCRatInt()
+{
+  BuildTable(fNParamsTPCRat,fParamsTPCRat,
+	     fNZSegTPCRat,fNPSegTPCRat,fNRSegTPCRat,
+	     fMinZTPCRat,fMaxZTPCRat, 
+	     &fSegZTPCRat,&fSegPTPCRat,&fSegRTPCRat,
+	     &fBegSegPTPCRat,&fNSegPTPCRat,
+	     &fBegSegRTPCRat,&fNSegRTPCRat, 
+	     &fSegIDTPCRat);
+}
+
+#endif
+
+//_______________________________________________
+#ifdef  _INC_CREATION_ALICHEB3D_
+
+//__________________________________________________________________________________________
+AliMagWrapCheb::AliMagWrapCheb(const char* inputFile) : 
+  fNParamsSol(0),fNZSegSol(0),fNPSegSol(0),fNRSegSol(0),
+  fSegZSol(0),fSegPSol(0),fSegRSol(0),
+  fBegSegPSol(0),fNSegPSol(0),fBegSegRSol(0),fNSegRSol(0),fSegIDSol(0),fMinZSol(1.e6),fMaxZSol(-1.e6),fParamsSol(0),fMaxRSol(0),
+//
+  fNParamsTPC(0),fNZSegTPC(0),fNPSegTPC(0),fNRSegTPC(0),
+  fSegZTPC(0),fSegPTPC(0),fSegRTPC(0),
+  fBegSegPTPC(0),fNSegPTPC(0),fBegSegRTPC(0),fNSegRTPC(0),fSegIDTPC(0),fMinZTPC(1.e6),fMaxZTPC(-1.e6),fParamsTPC(0),fMaxRTPC(0),
+//
+  fNParamsTPCRat(0),fNZSegTPCRat(0),fNPSegTPCRat(0),fNRSegTPCRat(0),
+  fSegZTPCRat(0),fSegPTPCRat(0),fSegRTPCRat(0),
+  fBegSegPTPCRat(0),fNSegPTPCRat(0),fBegSegRTPCRat(0),fNSegRTPCRat(0),fSegIDTPCRat(0),fMinZTPCRat(1.e6),fMaxZTPCRat(-1.e6),fParamsTPCRat(0),fMaxRTPCRat(0),
+//
+  fNParamsDip(0),fNZSegDip(0),fNYSegDip(0),fNXSegDip(0),
+  fSegZDip(0),fSegYDip(0),fSegXDip(0),
+  fBegSegYDip(0),fNSegYDip(0),fBegSegXDip(0),fNSegXDip(0),fSegIDDip(0),fMinZDip(1.e6),fMaxZDip(-1.e6),fParamsDip(0)
+//
+{
+  // construct from coeffs from the text file
+  LoadData(inputFile);
+}
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::AddParamSol(const AliCheb3D* param)
+{
+  // adds new parameterization piece for Sol
+  // NOTE: pieces must be added strictly in increasing R then increasing Z order
+  //
+  if (!fParamsSol) fParamsSol = new TObjArray();
+  fParamsSol->Add( (AliCheb3D*)param );
+  fNParamsSol++;
+  if (fMaxRSol<param->GetBoundMax(0)) fMaxRSol = param->GetBoundMax(0);
   //
-  if (fMeasuredMap) fMeasuredMap->GetTPCInt(xyz,b);
-  for (int i=3;i--;) b[i] *= fFactor;
 }
 
-//_______________________________________________________________________
-void AliMagWrapCheb::GetTPCIntCyl(Float_t *rphiz, Float_t *b) const
+//__________________________________________________________________________________________
+void AliMagWrapCheb::AddParamTPCInt(const AliCheb3D* param)
 {
-  // Method to calculate the integral of magnetic integral from point to nearest cathode plane
-  // in cylindrical coordiates ( -pi<phi<pi convention )
-  if (fMeasuredMap) fMeasuredMap->GetTPCIntCyl(rphiz,b);
-  for (int i=3;i--;) b[i] *= fFactor;
+  // adds new parameterization piece for TPCInt
+  // NOTE: pieces must be added strictly in increasing R then increasing Z order
+  //
+  if (!fParamsTPC) fParamsTPC = new TObjArray();
+  fParamsTPC->Add( (AliCheb3D*)param);
+  fNParamsTPC++;
+  if (fMaxRTPC<param->GetBoundMax(0)) fMaxRTPC = param->GetBoundMax(0);
+  //
+}
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::AddParamTPCRatInt(const AliCheb3D* param)
+{
+  // adds new parameterization piece for TPCRatInt
+  // NOTE: pieces must be added strictly in increasing R then increasing Z order
+  //
+  if (!fParamsTPCRat) fParamsTPCRat = new TObjArray();
+  fParamsTPCRat->Add( (AliCheb3D*)param);
+  fNParamsTPCRat++;
+  if (fMaxRTPCRat<param->GetBoundMax(0)) fMaxRTPCRat = param->GetBoundMax(0);
+  //
+}
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::AddParamDip(const AliCheb3D* param)
+{
+  // adds new parameterization piece for Dipole
+  //
+  if (!fParamsDip) fParamsDip = new TObjArray();
+  fParamsDip->Add( (AliCheb3D*)param);
+  fNParamsDip++;
+  //
+}
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::ResetTPCInt()
+{
+  // clean TPC field integral (used for update)
+  if (fNParamsTPC) {
+    delete   fParamsTPC;  fParamsTPC = 0;
+    delete[] fSegZTPC;    fSegZTPC   = 0;
+    delete[] fSegPTPC;    fSegPTPC   = 0;
+    delete[] fSegRTPC;    fSegRTPC   = 0;
+    delete[] fBegSegPTPC; fBegSegPTPC = 0;
+    delete[] fNSegPTPC;   fNSegPTPC   = 0;
+    delete[] fBegSegRTPC; fBegSegRTPC = 0;
+    delete[] fNSegRTPC;   fNSegRTPC   = 0;
+    delete[] fSegIDTPC;   fSegIDTPC   = 0;   
+  }
+  fNParamsTPC = fNZSegTPC = fNPSegTPC = fNRSegTPC = 0;
+  fMinZTPC = 1e6;
+  fMaxZTPC = -1e6;
+  fMaxRTPC = 0;
+  //
+}
+
+//__________________________________________________________________________________________
+void AliMagWrapCheb::ResetTPCRatInt()
+{
+  // clean TPCRat field integral (used for update)
+  if (fNParamsTPCRat) {
+    delete   fParamsTPCRat;  fParamsTPCRat = 0;
+    delete[] fSegZTPCRat;    fSegZTPCRat   = 0;
+    delete[] fSegPTPCRat;    fSegPTPCRat   = 0;
+    delete[] fSegRTPCRat;    fSegRTPCRat   = 0;
+    delete[] fBegSegPTPCRat; fBegSegPTPCRat = 0;
+    delete[] fNSegPTPCRat;   fNSegPTPCRat   = 0;
+    delete[] fBegSegRTPCRat; fBegSegRTPCRat = 0;
+    delete[] fNSegRTPCRat;   fNSegRTPCRat   = 0;
+    delete[] fSegIDTPCRat;   fSegIDTPCRat   = 0;   
+  }
+  fNParamsTPCRat = fNZSegTPCRat = fNPSegTPCRat = fNRSegTPCRat = 0;
+  fMinZTPCRat = 1e6;
+  fMaxZTPCRat = -1e6;
+  fMaxRTPCRat = 0;
+  //
+}
+
+
+//__________________________________________________
+void AliMagWrapCheb::BuildTable(Int_t npar,TObjArray *parArr, Int_t &nZSeg, Int_t &nYSeg, Int_t &nXSeg,
+				Float_t &minZ,Float_t &maxZ,
+				Float_t **segZ,Float_t **segY,Float_t **segX,
+				Int_t **begSegY,Int_t **nSegY,
+				Int_t **begSegX,Int_t **nSegX,
+				Int_t **segID)
+{
+  // build lookup table for dipole
+  //
+  if (npar<1) return;
+  TArrayF segYArr,segXArr;
+  TArrayI begSegYDipArr,begSegXDipArr;
+  TArrayI nSegYDipArr,nSegXDipArr;
+  TArrayI segIDArr;
+  float *tmpSegZ,*tmpSegY,*tmpSegX;
+  //
+  // create segmentation in Z
+  nZSeg = SegmentDimension(&tmpSegZ, parArr, npar, 2, 1,-1, 1,-1, 1,-1) - 1;
+  nYSeg = 0;
+  nXSeg = 0;
+  //
+  // for each Z slice create segmentation in Y
+  begSegYDipArr.Set(nZSeg);
+  nSegYDipArr.Set(nZSeg);
+  float xyz[3];
+  for (int iz=0;iz<nZSeg;iz++) {
+    printf("\nZSegment#%d  %+e : %+e\n",iz,tmpSegZ[iz],tmpSegZ[iz+1]);
+    int ny = SegmentDimension(&tmpSegY, parArr, npar, 1, 
+			      1,-1, 1,-1, tmpSegZ[iz],tmpSegZ[iz+1]) - 1;
+    segYArr.Set(ny + nYSeg);
+    for (int iy=0;iy<ny;iy++) segYArr[nYSeg+iy] = tmpSegY[iy];
+    begSegYDipArr[iz] = nYSeg;
+    nSegYDipArr[iz] = ny;
+    printf(" Found %d YSegments, to start from %d\n",ny, begSegYDipArr[iz]);
+    //
+    // for each slice in Z and Y create segmentation in X
+    begSegXDipArr.Set(nYSeg+ny);
+    nSegXDipArr.Set(nYSeg+ny);
+    xyz[2] = (tmpSegZ[iz]+tmpSegZ[iz+1])/2.; // mean Z of this segment
+    //
+    for (int iy=0;iy<ny;iy++) {
+      int isg = nYSeg+iy;
+      printf("\n   YSegment#%d  %+e : %+e\n",iy, tmpSegY[iy],tmpSegY[iy+1]);
+      int nx = SegmentDimension(&tmpSegX, parArr, npar, 0, 
+				1,-1, tmpSegY[iy],tmpSegY[iy+1], tmpSegZ[iz],tmpSegZ[iz+1]) - 1;
+      //
+      segXArr.Set(nx + nXSeg);
+      for (int ix=0;ix<nx;ix++) segXArr[nXSeg+ix] = tmpSegX[ix];
+      begSegXDipArr[isg] = nXSeg;
+      nSegXDipArr[isg] = nx;
+      printf("   Found %d XSegments, to start from %d\n",nx, begSegXDipArr[isg]);
+      //
+      segIDArr.Set(nXSeg+nx);
+      //
+      // find corresponding params
+      xyz[1] = (tmpSegY[iy]+tmpSegY[iy+1])/2.; // mean Y of this segment
+      //
+      for (int ix=0;ix<nx;ix++) {
+	xyz[0] = (tmpSegX[ix]+tmpSegX[ix+1])/2.; // mean X of this segment
+	for (int ipar=0;ipar<npar;ipar++) {
+	  AliCheb3D* cheb = (AliCheb3D*) parArr->At(ipar);
+	  if (!cheb->IsInside(xyz)) continue;
+	  segIDArr[nXSeg+ix] = ipar;
+	  break;
+	}
+      }
+      nXSeg += nx;
+      //
+      delete[] tmpSegX;
+    }
+    delete[] tmpSegY;
+    nYSeg += ny;
+  }
+  //
+  minZ = tmpSegZ[0];
+  maxZ = tmpSegZ[nZSeg];
+  (*segZ)  = new Float_t[nZSeg];
+  for (int i=nZSeg;i--;) (*segZ)[i] = tmpSegZ[i];
+  delete[] tmpSegZ;
+  //
+  (*segY)    = new Float_t[nYSeg];
+  (*segX)    = new Float_t[nXSeg];
+  (*begSegY) = new Int_t[nZSeg];
+  (*nSegY)   = new Int_t[nZSeg];
+  (*begSegX) = new Int_t[nYSeg];
+  (*nSegX)   = new Int_t[nYSeg];
+  (*segID)   = new Int_t[nXSeg];
+  //
+  for (int i=nYSeg;i--;) (*segY)[i] = segYArr[i];
+  for (int i=nXSeg;i--;) (*segX)[i] = segXArr[i];
+  for (int i=nZSeg;i--;) {(*begSegY)[i] = begSegYDipArr[i]; (*nSegY)[i] = nSegYDipArr[i];}
+  for (int i=nYSeg;i--;) {(*begSegX)[i] = begSegXDipArr[i]; (*nSegX)[i] = nSegXDipArr[i];}
+  for (int i=nXSeg;i--;) {(*segID)[i]   = segIDArr[i];}
+  //
 }
 
-//_______________________________________________________________________
-void AliMagWrapCheb::Field(Float_t *xyz, Float_t *b) const
+/*
+//__________________________________________________
+void AliMagWrapCheb::BuildTableDip()
 {
-  // Method to calculate the field at point  xyz
+  // build lookup table for dipole
+  //
+  if (fNParamsDip<1) return;
+  TArrayF segY,segX;
+  TArrayI begSegYDip,begSegXDip;
+  TArrayI nsegYDip,nsegXDip;
+  TArrayI segID;
+  float *tmpSegZ,*tmpSegY,*tmpSegX;
+  //
+  // create segmentation in Z
+  fNZSegDip = SegmentDimension(&tmpSegZ, fParamsDip, fNParamsDip, 2, 1,-1, 1,-1, 1,-1) - 1;
+  fNYSegDip = 0;
+  fNXSegDip = 0;
+  //
+  // for each Z slice create segmentation in Y
+  begSegYDip.Set(fNZSegDip);
+  nsegYDip.Set(fNZSegDip);
+  float xyz[3];
+  for (int iz=0;iz<fNZSegDip;iz++) {
+    printf("\nZSegment#%d  %+e : %+e\n",iz,tmpSegZ[iz],tmpSegZ[iz+1]);
+    int ny = SegmentDimension(&tmpSegY, fParamsDip, fNParamsDip, 1, 
+				 1,-1, 1,-1, tmpSegZ[iz],tmpSegZ[iz+1]) - 1;
+    segY.Set(ny + fNYSegDip);
+    for (int iy=0;iy<ny;iy++) segY[fNYSegDip+iy] = tmpSegY[iy];
+    begSegYDip[iz] = fNYSegDip;
+    nsegYDip[iz] = ny;
+    printf(" Found %d YSegments, to start from %d\n",ny, begSegYDip[iz]);
+    //
+    // for each slice in Z and Y create segmentation in X
+    begSegXDip.Set(fNYSegDip+ny);
+    nsegXDip.Set(fNYSegDip+ny);
+    xyz[2] = (tmpSegZ[iz]+tmpSegZ[iz+1])/2.; // mean Z of this segment
+    //
+    for (int iy=0;iy<ny;iy++) {
+      int isg = fNYSegDip+iy;
+      printf("\n   YSegment#%d  %+e : %+e\n",iy, tmpSegY[iy],tmpSegY[iy+1]);
+      int nx = SegmentDimension(&tmpSegX, fParamsDip, fNParamsDip, 0, 
+				1,-1, tmpSegY[iy],tmpSegY[iy+1], tmpSegZ[iz],tmpSegZ[iz+1]) - 1;
+      //
+      segX.Set(nx + fNXSegDip);
+      for (int ix=0;ix<nx;ix++) segX[fNXSegDip+ix] = tmpSegX[ix];
+      begSegXDip[isg] = fNXSegDip;
+      nsegXDip[isg] = nx;
+      printf("   Found %d XSegments, to start from %d\n",nx, begSegXDip[isg]);
+      //
+      segID.Set(fNXSegDip+nx);
+      //
+      // find corresponding params
+      xyz[1] = (tmpSegY[iy]+tmpSegY[iy+1])/2.; // mean Y of this segment
+      //
+      for (int ix=0;ix<nx;ix++) {
+	xyz[0] = (tmpSegX[ix]+tmpSegX[ix+1])/2.; // mean X of this segment
+	for (int ipar=0;ipar<fNParamsDip;ipar++) {
+	  AliCheb3D* cheb = (AliCheb3D*) fParamsDip->At(ipar);
+	  if (!cheb->IsInside(xyz)) continue;
+	  segID[fNXSegDip+ix] = ipar;
+	  break;
+	}
+      }
+      fNXSegDip += nx;
+      //
+      delete[] tmpSegX;
+    }
+    delete[] tmpSegY;
+    fNYSegDip += ny;
+  }
+  //
+  fMinZDip = tmpSegZ[0];
+  fMaxZDip = tmpSegZ[fNZSegDip];
+  fSegZDip    = new Float_t[fNZSegDip];
+  for (int i=fNZSegDip;i--;) fSegZDip[i] = tmpSegZ[i];
+  delete[] tmpSegZ;
+  //
+  fSegYDip    = new Float_t[fNYSegDip];
+  fSegXDip    = new Float_t[fNXSegDip];
+  fBegSegYDip = new Int_t[fNZSegDip];
+  fNSegYDip   = new Int_t[fNZSegDip];
+  fBegSegXDip = new Int_t[fNYSegDip];
+  fNSegXDip   = new Int_t[fNYSegDip];
+  fSegIDDip   = new Int_t[fNXSegDip];
+  //
+  for (int i=fNYSegDip;i--;) fSegYDip[i] = segY[i];
+  for (int i=fNXSegDip;i--;) fSegXDip[i] = segX[i];
+  for (int i=fNZSegDip;i--;) {fBegSegYDip[i] = begSegYDip[i]; fNSegYDip[i] = nsegYDip[i];}
+  for (int i=fNYSegDip;i--;) {fBegSegXDip[i] = begSegXDip[i]; fNSegXDip[i] = nsegXDip[i];}
+  for (int i=fNXSegDip;i--;) {fSegIDDip[i]   = segID[i];}
   //
-  if (fMeasuredMap) fMeasuredMap->Field(xyz,b);
-  for (int i=3;i--;) b[i] *= fFactor;
 }
+*/
 
-//_______________________________________________________________________
-AliMagWrapCheb& AliMagWrapCheb::operator=(const AliMagWrapCheb& maps)
+//________________________________________________________________
+void AliMagWrapCheb::SaveData(const char* outfile) const
 {
-  if (this != &maps && maps.fMeasuredMap) { 
-    if (fMeasuredMap) delete fMeasuredMap;
-    fMeasuredMap = new AliMagFCheb(*maps.fMeasuredMap);
+  // writes coefficients data to output text file
+  TString strf = outfile;
+  gSystem->ExpandPathName(strf);
+  FILE* stream = fopen(strf,"w+");
+  //
+  // Sol part    ---------------------------------------------------------
+  fprintf(stream,"# Set of Chebyshev parameterizations for ALICE magnetic field\nSTART %s\n",GetName());
+  fprintf(stream,"START SOLENOID\n#Number of pieces\n%d\n",fNParamsSol);
+  for (int ip=0;ip<fNParamsSol;ip++) GetParamSol(ip)->SaveData(stream);
+  fprintf(stream,"#\nEND SOLENOID\n");
+  //
+  // TPCInt part ---------------------------------------------------------
+  fprintf(stream,"# Set of Chebyshev parameterizations for ALICE magnetic field\nSTART %s\n",GetName());
+  fprintf(stream,"START TPCINT\n#Number of pieces\n%d\n",fNParamsTPC);
+  for (int ip=0;ip<fNParamsTPC;ip++) GetParamTPCInt(ip)->SaveData(stream);
+  fprintf(stream,"#\nEND TPCINT\n");
+  //
+  // TPCRatInt part ---------------------------------------------------------
+  fprintf(stream,"# Set of Chebyshev parameterizations for ALICE magnetic field\nSTART %s\n",GetName());
+  fprintf(stream,"START TPCRatINT\n#Number of pieces\n%d\n",fNParamsTPCRat);
+  for (int ip=0;ip<fNParamsTPCRat;ip++) GetParamTPCRatInt(ip)->SaveData(stream);
+  fprintf(stream,"#\nEND TPCRatINT\n");
+  //
+  // Dip part   ---------------------------------------------------------
+  fprintf(stream,"START DIPOLE\n#Number of pieces\n%d\n",fNParamsDip);
+  for (int ip=0;ip<fNParamsDip;ip++) GetParamDip(ip)->SaveData(stream);
+  fprintf(stream,"#\nEND DIPOLE\n");
+  //
+  fprintf(stream,"#\nEND %s\n",GetName());
+  //
+  fclose(stream);
+  //
+}
+
+Int_t AliMagWrapCheb::SegmentDimension(float** seg,const TObjArray* par,int npar, int dim, 
+				       float xmn,float xmx,float ymn,float ymx,float zmn,float zmx)
+{
+  // find all boundaries in deimension dim for boxes in given region.
+  // if mn>mx for given projection the check is not done for it.
+  float *tmpC = new float[2*npar];
+  int *tmpInd = new int[2*npar];
+  int nseg0 = 0;
+  for (int ip=0;ip<npar;ip++) {
+    AliCheb3D* cheb = (AliCheb3D*) par->At(ip);
+    if (xmn<xmx && (cheb->GetBoundMin(0)>(xmx+xmn)/2 || cheb->GetBoundMax(0)<(xmn+xmx)/2)) continue;
+    if (ymn<ymx && (cheb->GetBoundMin(1)>(ymx+ymn)/2 || cheb->GetBoundMax(1)<(ymn+ymx)/2)) continue;
+    if (zmn<zmx && (cheb->GetBoundMin(2)>(zmx+zmn)/2 || cheb->GetBoundMax(2)<(zmn+zmx)/2)) continue;
+    //
+    tmpC[nseg0++] = cheb->GetBoundMin(dim);
+    tmpC[nseg0++] = cheb->GetBoundMax(dim);    
+  }
+  // range Dim's boundaries in increasing order
+  TMath::Sort(nseg0,tmpC,tmpInd,kFALSE);
+  // count number of really different Z's
+  int nseg = 0;
+  float cprev = -1e6;
+  for (int ip=0;ip<nseg0;ip++) {
+    if (TMath::Abs(cprev-tmpC[ tmpInd[ip] ])>1e-4) {
+      cprev = tmpC[ tmpInd[ip] ];
+      nseg++;
+    }
+    else tmpInd[ip] = -1; // supress redundant Z
   }
-  return *this;
+  // 
+  *seg  = new float[nseg]; // create final Z segmenations
+  nseg = 0;
+  for (int ip=0;ip<nseg0;ip++) if (tmpInd[ip]>=0) (*seg)[nseg++] = tmpC[ tmpInd[ip] ];
+  //
+  delete[] tmpC;
+  delete[] tmpInd;
+  return nseg;
 }
+
+#endif
+