restore threshold getters after parameter dynamics update (fw v. >= A012)
[u/mrichter/AliRoot.git] / STAT / TKDInterpolator.cxx
index ad7f08d..1ada843 100644 (file)
 #include "TKDInterpolator.h"
+#include "TKDNodeInfo.h"
 
-#include "TLinearFitter.h"
-#include "TVector.h"
-#include "TTree.h"
-#include "TH2.h"
-#include "TObjArray.h"
-#include "TObjString.h"
-#include "TPad.h"
-#include "TBox.h"
-#include "TGraph.h"
-#include "TMarker.h"
-#include "TRandom.h"
-#include "TROOT.h"
+#include "TError.h"
+#include "TClonesArray.h"
 
 ClassImp(TKDInterpolator)
-ClassImp(TKDInterpolator::TKDNodeInfo)
 
-/////////////////////////////////////////////////////////////////////
-// Memory setup of protected data memebers
-// fRefPoints : evaluation point of PDF for each terminal node of underlying KD Tree.
-// | 1st terminal node (fNDim point coordinates) | 2nd terminal node (fNDim point coordinates) | ...
-//
-// fRefValues : evaluation value/error of PDF for each terminal node of underlying KD Tree.
-// | 1st terminal node (value) | 2nd terminal node (value) | ... | 1st terminal node (error) | 2nd terminal node (error) | ...
-//
-// status = |0|0|0|0|0|1(tri-cubic weights)|1(STORE)|1 INT(0 COG )|
-/////////////////////////////////////////////////////////////////////
+
 
 //_________________________________________________________________
-TKDInterpolator::TKDInterpolator() : TKDTreeIF()
-       ,fNTNodes(0)
-       ,fRefPoints(0x0)
-       ,fRefValues(0x0)
-       ,fCov(0x0)
-       ,fPar(0x0)
-       ,fPDFstatus(0x0)
-       ,fStatus(4)
-       ,fLambda(0)
-       ,fDepth(-1)
-       ,fBuffer(0x0)
-       ,fKDhelper(0x0)
-       ,fFitter(0x0)
+TKDInterpolator::TKDInterpolator() :
+  TKDInterpolatorBase()
 {
 // Default constructor. To be used with care since in this case building
 // of data structure is completly left to the user responsability.
 }
 
 //_________________________________________________________________
-TKDInterpolator::TKDInterpolator(Int_t npoints, Int_t ndim, UInt_t bsize, Float_t **data) : TKDTreeIF(npoints, ndim, bsize, data)
-       ,fNTNodes(GetNTerminalNodes())
-       ,fRefPoints(0x0)
-       ,fRefValues(0x0)
-       ,fCov(0x0)
-       ,fPar(0x0)
-       ,fPDFstatus(0x0)
-       ,fStatus(4)
-       ,fLambda(0)
-       ,fDepth(-1)
-       ,fBuffer(0x0)
-       ,fKDhelper(0x0)
-       ,fFitter(0x0)
-{
-// Wrapper constructor for the similar TKDTree one.
-       
-       Build();
-}
-
-
-//_________________________________________________________________
-TKDInterpolator::TKDInterpolator(TTree *t, const Char_t *var, const Char_t *cut, UInt_t bsize, Long64_t nentries, Long64_t firstentry) : TKDTreeIF()
-       ,fNTNodes(0)
-       ,fRefPoints(0x0)
-       ,fRefValues(0x0)
-       ,fCov(0x0)
-       ,fPar(0x0)
-       ,fPDFstatus(0x0)
-       ,fStatus(4)
-       ,fLambda(0)
-       ,fDepth(-1)
-       ,fBuffer(0x0)
-       ,fKDhelper(0x0)
-       ,fFitter(0x0)
-{
-// Alocate data from a tree. The variables which have to be analysed are
-// defined in the "var" parameter as a colon separated list. The format should
-// be identical to that used by TTree::Draw().
-//
-// 
-
-       TObjArray *vars = TString(var).Tokenize(":");
-       fNDim = vars->GetEntriesFast(); fNDimm = 2*fNDim;
-       if(fNDim > 6/*kDimMax*/) Warning("TKDInterpolator(TTree*, const Char_t, const Char_t, UInt_t)", Form("Variable number exceed maximum dimension %d. Results are unpredictable.", 6/*kDimMax*/));
-       fBucketSize = bsize;
-
-       Int_t np;
-       Double_t *v;
-       for(int idim=0; idim<fNDim; idim++){
-               if(!(np = t->Draw(((TObjString*)(*vars)[idim])->GetName(), cut, "goff", nentries, firstentry))){
-                       Warning("TKDInterpolator(TTree*, const Char_t, const Char_t, UInt_t)", Form("Can not access data for keys %s. Key defined on tree :", ((TObjString*)(*vars)[idim])->GetName() ));
-                       TIterator *it = (t->GetListOfLeaves())->MakeIterator();
-                       TObject *o;
-                       while(o = (*it)()) printf("\t%s\n", o->GetName());
-                       continue;
-               }
-               if(!fNpoints){
-                       fNpoints = np;
-                       Info("TKDInterpolator(TTree*, const Char_t, const Char_t, UInt_t)", Form("Allocating %d data points in %d dimensions.", fNpoints, fNDim));
-                       fData = new Float_t*[fNDim];
-                       for(int idim=0; idim<fNDim; idim++) fData[idim] = new Float_t[fNpoints];
-                       kDataOwner = kTRUE;
-               }
-               v = t->GetV1();
-               for(int ip=0; ip<fNpoints; ip++) fData[idim][ip] = (Float_t)v[ip];
-       }
-       TKDTreeIF::Build();
-       fNTNodes = GetNTerminalNodes();
-       Build();
-}
-
-//_________________________________________________________________
-TKDInterpolator::~TKDInterpolator()
-{
-       if(fCov){
-               delete [] fPar;
-               delete [] fCov;
-               delete [] fPDFstatus;
-       }
-       
-       if(fFitter) delete fFitter;
-       if(fKDhelper) delete fKDhelper;
-       if(fBuffer) delete [] fBuffer;
-       
-       if(fRefPoints){
-               for(int idim=0; idim<fNDim; idim++) delete [] fRefPoints[idim] ;
-               delete [] fRefPoints;
-       }
-       if(fRefValues) delete [] fRefValues;
-}
-
-//_________________________________________________________________
-void TKDInterpolator::Build()
+TKDInterpolator::TKDInterpolator(Int_t ndim, Int_t npoints) :
+  TKDInterpolatorBase(ndim)
 {
-// Fill interpolator's data array i.e.
-//  - estimation points 
-//  - corresponding PDF values
-
-       if(!fBoundaries) MakeBoundaries();
-       fLambda = 1 + fNDim + fNDim*(fNDim+1)/2;
-
-       // allocate memory for data
-       fRefValues = new Float_t[fNTNodes];
-       fRefPoints = new Float_t*[fNDim];
-       for(int id=0; id<fNDim; id++){
-               fRefPoints[id] = new Float_t[fNTNodes];
-               for(int in=0; in<fNTNodes; in++) fRefPoints[id][in] = 0.;
-       }
+// Wrapper constructor for the TKDTree.
 
-       Float_t *bounds = 0x0;
-       Int_t *indexPoints;
-       for(int inode=0, tnode = fNnodes; inode<fNTNodes-1; inode++, tnode++){
-               fRefValues[inode] =  Float_t(fBucketSize)/fNpoints;
-               bounds = GetBoundary(tnode);
-               for(int idim=0; idim<fNDim; idim++) fRefValues[inode] /= (bounds[2*idim+1] - bounds[2*idim]);
-
-               indexPoints = GetPointsIndexes(tnode);
-               // loop points in this terminal node
-               for(int idim=0; idim<fNDim; idim++){
-                       for(int ip = 0; ip<fBucketSize; ip++) fRefPoints[idim][inode] += fData[idim][indexPoints[ip]];
-                       fRefPoints[idim][inode] /= fBucketSize;
-               }
-       }
-
-       // analyze last (incomplete) terminal node
-       Int_t counts = fNpoints%fBucketSize;
-       counts = counts ? counts : fBucketSize;
-       Int_t inode = fNTNodes - 1, tnode = inode + fNnodes;
-       fRefValues[inode] =  Float_t(counts)/fNpoints;
-       bounds = GetBoundary(tnode);
-       for(int idim=0; idim<fNDim; idim++) fRefValues[inode] /= (bounds[2*idim+1] - bounds[2*idim]);
-
-       indexPoints = GetPointsIndexes(tnode);
-       // loop points in this terminal node
-       for(int idim=0; idim<fNDim; idim++){
-               for(int ip = 0; ip<counts; ip++) fRefPoints[idim][inode] += fData[idim][indexPoints[ip]];
-               fRefPoints[idim][inode] /= counts;
-       }
+  if(npoints) TKDInterpolatorBase::Build(npoints);
 }
 
-//__________________________________________________________________
-void TKDInterpolator::GetStatus()
-{
-       printf("Interpolator Status :\n");
-       printf("  Method : %s\n", fStatus&1 ? "INT" : "COG");
-       printf("  Store  : %s\n", fStatus&2 ? "YES" : "NO");
-       printf("  Weights: %s\n", fStatus&4 ? "YES" : "NO");
-
-       printf("nodes %d\n", fNTNodes);        //Number of evaluation data points
-       printf("refs 0x%x\n", fRefPoints);    //[fNDim][fNTNodes]
-       printf("vals 0x%x\n", fRefValues);     //[fNTNodes]
-       for(int i=0; i<fNTNodes; i++){
-               for(int idim=0; idim<fNDim; idim++) printf("%f ", fRefPoints[idim][i]);
-               printf("[%f]\n", fRefValues[i]);
-       }
-
-       printf("cov 0x%x\n", fCov);           //[fNTNodes] cov matrix array for nodes
-       printf("pars 0x%x\n", fPar);           //[fNTNodes] parameters array for nodes
-       for(int i=0; i<fNTNodes; i++){
-               printf("%d ", i);
-               for(int ip=0; ip<3; ip++) printf("p%d[%f] ", ip, fPar[i](ip));
-               printf("\n");
-       }
-       printf("pdf 0x%x\n", fPDFstatus);     //[fNTNodes] status bit for node's PDF
-}
 
 //_________________________________________________________________
-Double_t TKDInterpolator::Eval(const Double_t *point, Double_t &result, Double_t &error)
-{
-// Evaluate PDF for "point". The result is returned in "result" and error in "error". The function returns the chi2 of the fit.
-//
-// Observations:
-//
-// 1. The default method used for interpolation is kCOG.
-// 2. The initial number of neighbors used for the estimation is set to Int(alpha*fLambda) (alpha = 1.5)
-                       
-       Float_t pointF[50]; // local Float_t conversion for "point"
-       for(int idim=0; idim<fNDim; idim++) pointF[idim] = (Float_t)point[idim];
-       Int_t node = FindNode(pointF) - fNnodes;
-       if(fPDFstatus && (fStatus&1) && fPDFstatus[node]) return CookPDF(point, node, result, error);
-
-       // Allocate memory
-       if(!fBuffer) fBuffer = new Double_t[2*fLambda];
-       if(!fKDhelper) fKDhelper = new TKDTreeIF(fNTNodes, fNDim, 30, fRefPoints);
-       if(!fFitter) SetIntInterpolation(kFALSE);
-       
-       // generate parabolic for nD
-       //Float_t alpha = Float_t(2*lambda + 1) / fNTNodes; // the bandwidth or smoothing parameter
-       //Int_t npoints = Int_t(alpha * fNTNodes);
-       //printf("Params : %d NPoints %d\n", lambda, npoints);
-       // prepare workers
-
-       Int_t *index,  // indexes of NN 
-             ipar,    // local looping variable
-                               npoints = Int_t(1.5*fLambda); // number of data points used for interpolation
-       Float_t *dist, // distances of NN
-                                       d,     // NN normalized distance
-                                       w0,    // work
-                                       w;     // tri-cubic weight function
-       Double_t sig   // bucket error 
-               = TMath::Sqrt(1./fBucketSize);
-       do{
-               // find nearest neighbors
-               for(int idim=0; idim<fNDim; idim++) pointF[idim] = (Float_t)point[idim];
-               if(!fKDhelper->FindNearestNeighbors(pointF, npoints+1, index, dist)){
-                       Error("Eval()", Form("Failed retriving %d neighbours for point:", npoints));
-                       for(int idim=0; idim<fNDim; idim++) printf("%f ", point[idim]);
-                       printf("\n");
-                       return -1;
-               }
-               // add points to fitter
-               fFitter->ClearPoints();
-               for(int in=0; in<npoints; in++){
-                       if(fStatus&1){ // INT
-                               for(int idim=0; idim<fNDim; idim++) pointF[idim] = fRefPoints[idim][index[in]];
-                               Float_t *bounds = GetBoundary(FindNode(pointF));
-                               
-                               ipar = 0;
-                               for(int idim=0; idim<fNDim; idim++){
-                                       fBuffer[ipar++] = .5*(bounds[2*idim] + bounds[2*idim+1]);
-                                       fBuffer[ipar++] = (bounds[2*idim]*bounds[2*idim] + bounds[2*idim] * bounds[2*idim+1] + bounds[2*idim+1] * bounds[2*idim+1])/3.;
-                                       for(int jdim=idim+1; jdim<fNDim; jdim++) fBuffer[ipar++] = (bounds[2*idim] + bounds[2*idim+1]) * (bounds[2*jdim] + bounds[2*jdim+1]) * .25;
-                               }
-                       } else { // COG
-                               for(int idim=0; idim<fNDim; idim++) fBuffer[idim] = fRefPoints[idim][index[in]];
-                       }
-
-                       // calculate tri-cubic weighting function
-                       if(fStatus&4){
-                               d = dist[in]/ dist[npoints];
-                               w0 = (1. - d*d*d); w = w0*w0*w0;
-                       } else w = 1.;
-                        
-                       //for(int idim=0; idim<fNDim; idim++) printf("%f ", fBuffer[idim]);
-                       //printf("\nd[%f] w[%f] sig[%f]\n", d, w, sig);
-                       fFitter->AddPoint(fBuffer, fRefValues[index[in]], fRefValues[index[in]]*sig/w);
-               }
-               npoints += 4;
-       } while(fFitter->Eval());
-
-       // retrive fitter results
-       TMatrixD cov(fLambda, fLambda);
-       TVectorD par(fLambda);
-       fFitter->GetCovarianceMatrix(cov);
-       fFitter->GetParameters(par);
-       Double_t chi2 = fFitter->GetChisquare()/(npoints - 4 - fLambda);
-
-       // store results
-       if(fStatus&2 && fStatus&1){
-               fPar[node] = par;
-               fCov[node] = cov;
-               fPDFstatus[node] = 1;
-       }
-               
-       // Build df/dpi|x values
-       Double_t *fdfdp = &fBuffer[fLambda];
-       ipar = 0;
-       fdfdp[ipar++] = 1.;
-       for(int idim=0; idim<fNDim; idim++){
-               fdfdp[ipar++] = point[idim];
-               for(int jdim=idim; jdim<fNDim; jdim++) fdfdp[ipar++] = point[idim]*point[jdim];
-       }
-
-       // calculate estimation
-       result =0.; error = 0.;
-       for(int i=0; i<fLambda; i++){
-               result += fdfdp[i]*par(i);
-               for(int j=0; j<fLambda; j++) error += fdfdp[i]*fdfdp[j]*cov(i,j);
-       }       
-       error = TMath::Sqrt(error);
-
-       return chi2;
-}
-
-// //_________________________________________________________________
-// Double_t TKDInterpolator::Eval1(const Double_t *point, Int_t npoints, Double_t &result, Double_t &error)
-// {
-// // Evaluate PDF at k-dimensional position "point". The initial number of
-// // neighbour estimation points is set to "npoints". The default method
-// // used for interpolation is kCOG.
-// 
-//     // calculate number of parameters in the parabolic expresion
-//     Int_t lambda = 1 + fNDim + fNDim*(fNDim+1)/2;
-// 
-//     if(!fBuffer) fBuffer = new Double_t[lambda-1];
-//     if(!fKDhelper) fKDhelper = new TKDTreeIF(GetNTerminalNodes(), fNDim, npoints, fRefPoints);
-// 
-//     if(!fFitter) fFitter = new TLinearFitter(lambda, Form("hyp%d", fNDim+1));
-//     else fFitter->SetFormula(Form("hyp%d", fNDim+1));
-// 
-// 
-//     Float_t pointF[50];
-//     for(int idim=0; idim<fNDim; idim++) pointF[idim] = point[idim];
-//     Int_t istart = 0;
-//     Int_t *index, ipar;
-//     Float_t *bounds, *dist, *w = new Float_t[fNDim];
-//     Double_t uncertainty = TMath::Sqrt(1./fBucketSize);
-//     fFitter->ClearPoints();
-//     do{
-//             if(!fKDhelper->FindNearestNeighbors(pointF, npoints+1, index, dist)){
-//                     Error("Eval()", Form("Failed retriving %d neighbours for point:", npoints));
-//                     for(int idim=0; idim<fNDim; idim++) printf("%f ", point[idim]);
-//                     printf("\n");
-//                     return -1;
-//             }
-//             for(int in=istart; in<npoints; in++){
-//                     for(int idim=0; idim<fNDim; idim++) w[idim] = fRefPoints[idim][index[in]];
-//                     bounds = GetBoundary(FindNode(w));
-// 
-//                     ipar = 0;
-//                     for(int idim=0; idim<fNDim; idim++){
-//                             fBuffer[ipar++] = .5*(bounds[2*idim] + bounds[2*idim+1]);
-//                             fBuffer[ipar++] = (bounds[2*idim]*bounds[2*idim] + bounds[2*idim] * bounds[2*idim+1] + bounds[2*idim+1] * bounds[2*idim+1])/3.;
-//                             for(int jdim=idim+1; jdim<fNDim; jdim++) fBuffer[ipar++] = (bounds[2*idim] + bounds[2*idim+1]) * (bounds[2*jdim] + bounds[2*jdim+1]) * .25;
-//                     }
-// 
-//                     fFitter->AddPoint(fBuffer, fRefValues[index[in]], fRefValues[index[in]]*uncertainty);
-//             }
-//             istart = npoints;
-//             npoints += 4;
-//     } while(fFitter->Eval());
-//     delete [] w;
-// 
-//     // calculate evaluation
-// //  fFitter->PrintResults(3);
-//     TMatrixD cov(lambda, lambda);
-//     TVectorD par(lambda);
-//     fFitter->GetCovarianceMatrix(cov);
-//     fFitter->GetParameters(par);
-// 
-//     // Build temporary array to keep values df/dpi|x
-//     Double_t f[100];
-//     ipar = 0;
-//     f[ipar++] = 1.;
-//     for(int idim=0; idim<fNDim; idim++){
-//             f[ipar++] = point[idim];
-//             for(int jdim=idim; jdim<fNDim; jdim++) f[ipar++] = point[idim]*point[jdim];
-//     }
-//     result =0.; error = 0.;
-//     for(int i=0; i<lambda; i++){
-//             result += f[i]*par[i];
-//             for(int j=0; j<lambda; j++) error += f[i]*f[j]*cov(i,j);
-//     }
-//     error = TMath::Sqrt(error);
-//     Double_t chi2 = fFitter->GetChisquare()/(npoints - 4 - lambda);
-// 
-//     for(int ipar=0; ipar<lambda; ipar++) printf("%d %8.6e %8.6e\n", ipar, par[ipar], TMath::Sqrt(cov(ipar, ipar)));
-//     printf("result %6.3f +- %6.3f [%f]\n", result, error, chi2);
-//     return chi2;
-// }
-
-
-//_________________________________________________________________
-void TKDInterpolator::DrawNodes(UInt_t ax1, UInt_t ax2, Int_t depth)
+TKDInterpolator::~TKDInterpolator()
 {
-// Draw nodes structure projected on plane "ax1:ax2". The parameter
-// "depth" specifies the bucket size per node. If depth == -1 draw only
-// terminal nodes and evaluation points (default -1 i.e. bucket size per node equal bucket size specified by the user)
-//
-// Observation:
-// This function creates the nodes (TBox) array for the specified depth
-// but don't delete it. Abusing this function may cause memory leaks !
-
-
-       if(!fBoundaries) MakeBoundaries();
-
-       // Count nodes in specific view
-       Int_t nnodes = 0;
-       for(int inode = 0; inode <= 2*fNnodes; inode++){
-               if(depth == -1){
-                       if(!IsTerminal(inode)) continue;
-               } else if((inode+1) >> depth != 1) continue;
-               nnodes++;
-       }
-
-       //printf("depth %d nodes %d\n", depth, nnodes);
-       
-       TH2 *h2 = 0x0;
-       if(!(h2 = (TH2S*)gROOT->FindObject("hNodes"))) h2 = new TH2S("hNodes", "", 100, fRange[2*ax1], fRange[2*ax1+1], 100, fRange[2*ax2], fRange[2*ax2+1]);
-       h2->GetXaxis()->SetTitle(Form("x_{%d}", ax1));
-       h2->GetYaxis()->SetTitle(Form("x_{%d}", ax2));
-       h2->Draw();
-       
-       const Float_t border = 0.;//1.E-4;
-       TBox *node_array = new TBox[nnodes], *node;
-       Float_t *bounds = 0x0;
-       nnodes = 0;
-       for(int inode = 0; inode <= 2*fNnodes; inode++){
-               if(depth == -1){
-                       if(!IsTerminal(inode)) continue;
-               } else if((inode+1) >> depth != 1) continue;
-
-               node = &node_array[nnodes++];
-               //node = new TBox(bounds[2*ax1]+border, bounds[2*ax2]+border, bounds[2*ax1+1]-border, bounds[2*ax2+1]-border);
-               node->SetFillStyle(3002);       
-               node->SetFillColor(50+Int_t(gRandom->Uniform()*50.));
-               bounds = GetBoundary(inode);
-               node->DrawBox(bounds[2*ax1]+border, bounds[2*ax2]+border, bounds[2*ax1+1]-border, bounds[2*ax2+1]-border);
-       }
-       if(depth != -1) return;
-
-       // Draw reference points
-       TGraph *ref = new TGraph(GetNTerminalNodes());
-       ref->SetMarkerStyle(3);
-       ref->SetMarkerSize(.7);
-       ref->SetMarkerColor(2);
-       for(int inode = 0; inode < GetNTerminalNodes(); inode++) ref->SetPoint(inode, fRefPoints[ax1][inode], fRefPoints[ax2][inode]);
-       ref->Draw("p");
-       return;
 }
 
 //_________________________________________________________________
-void TKDInterpolator::DrawNode(Int_t tnode, UInt_t ax1, UInt_t ax2)
+void TKDInterpolator::AddNode(const TKDNodeInfo &node)
 {
-// Draw node "node" and the data points within.
-//
-// Observation:
-// This function creates some graphical objects
-// but don't delete it. Abusing this function may cause memory leaks !
-
-       if(tnode < 0 || tnode >= GetNTerminalNodes()){
-               Warning("DrawNode()", Form("Terminal node %d outside defined range.", tnode));
-               return;
-       }
-
-       Int_t inode = tnode;
-       tnode += fNnodes;
-       // select zone of interest in the indexes array
-       Int_t *index = GetPointsIndexes(tnode);
-       Int_t nPoints = (tnode == 2*fNnodes) ? fNpoints%fBucketSize : fBucketSize;
-
-       // draw data points
-       TGraph *g = new TGraph(nPoints);
-       g->SetMarkerStyle(7);
-       for(int ip = 0; ip<nPoints; ip++) g->SetPoint(ip, fData[ax1][index[ip]], fData[ax2][index[ip]]);
-
-       // draw estimation point
-       TMarker *m=new TMarker(fRefPoints[ax1][inode], fRefPoints[ax2][inode], 20);
-       m->SetMarkerColor(2);
-       m->SetMarkerSize(1.7);
-       
-       // draw node contour
-       Float_t *bounds = GetBoundary(tnode);
-       TBox *n = new TBox(bounds[2*ax1], bounds[2*ax2], bounds[2*ax1+1], bounds[2*ax2+1]);
-       n->SetFillStyle(0);
-
-       if(gPad) gPad->Clear(); 
-       g->Draw("ap");
-       m->Draw();
-       n->Draw();
-       
-       return;
-}
+  if(!fNodes){
+    Warning("TKDInterpolator::SetNode()", "Node array not defined.");
+    return;
+  }
 
-
-//__________________________________________________________________
-void TKDInterpolator::SetIntInterpolation(const Bool_t on)
-{
-// Set interpolation bit to "on" and build/delete memory
-       
-       if(on) fStatus += fStatus&1 ? 0 : 1;
-       else fStatus += fStatus&1 ? -1 : 0;
-       TString formula;
-       if(on) formula = Form("hyp%d", fLambda-1);
-       else {
-               formula = "1";
-               for(int idim=0; idim<fNDim; idim++){
-                       formula += Form("++x[%d]", idim);
-                       for(int jdim=idim; jdim<fNDim; jdim++) formula += Form("++x[%d]*x[%d]", idim, jdim);
-               }
-       }
-       if(!fFitter) fFitter = new TLinearFitter(fLambda, formula.Data());
-       else fFitter->SetFormula(formula.Data());
+  Int_t n(GetNTNodes());
+  new((*fNodes)[n++]) TKDNodeInfo(node);
 }
 
-
 //_________________________________________________________________
-void TKDInterpolator::SetSetStore(const Bool_t on)
+Bool_t TKDInterpolator::Build(Int_t npoints, Int_t ndim)
 {
-// Set store bit to "on" and build/delete memory
-       
-       if(on){
-               fStatus += fStatus&2 ? 0 : 2;
-               if(!fCov){
-                       fPDFstatus = new Bool_t[fNTNodes];
-                       fCov = new TMatrixD[fNTNodes];
-                       fPar = new TVectorD[fNTNodes];
-                       for(int i=0; i<fNTNodes; i++){
-                               fPDFstatus[i] = kFALSE;
-                               fCov[i].ResizeTo(fLambda, fLambda);
-                               fPar[i].ResizeTo(fLambda);
-                       }
-               }
-       } else {
-               fStatus += fStatus&2 ? -2 : 0;
-               if(fCov){
-                       delete [] fPar;
-                       delete [] fCov;
-                       delete [] fPDFstatus;
-               }
-       }
+  fNSize = ndim;
+  return TKDInterpolatorBase::Build(npoints);
 }
 
 //_________________________________________________________________
-void TKDInterpolator::SetUseWeights(const Bool_t on)
+Int_t TKDInterpolator::GetNodeIndex(const Float_t *p)
 {
-       if(on) fStatus += fStatus&4 ? 0 : 4;
-       else fStatus += fStatus&4 ? -4 : 0;
+//     printf("TKDInterpolator::GetNodeIndex() ...\n");
+//   printf("Looking for p[");
+//   for(int i=0; i<fNSize; i++) printf("%f ", p[i]);
+//   printf("] ...\n");
+
+  for(Int_t i=GetNTNodes(); i--;)
+    if(((TKDNodeInfo*)(*fNodes)[i])->Has(p)) return i;
+  
+  printf("Point p[");
+  for(int i=0; i<fNSize; i++) printf("%f ", p[i]);
+  printf("] outside range.\n");
+  return -1;
 }
 
 
 //_________________________________________________________________
-Double_t TKDInterpolator::CookPDF(const Double_t *point, const Int_t node, Double_t &result, Double_t &error)
+Bool_t TKDInterpolator::SetNode(Int_t inode, const TKDNodeInfo &ref)
 {
-// Recalculate the PDF for one node from the results of interpolation (parameters and covariance matrix)
-
-       Info("CookPDF()", Form("Called for node %d", node));
-
-       if(!fBuffer) fBuffer = new Double_t[2*fLambda];
-       Double_t *fdfdp = &fBuffer[fLambda];
-       Int_t ipar = 0;
-       fdfdp[ipar++] = 1.;
-       for(int idim=0; idim<fNDim; idim++){
-               fdfdp[ipar++] = point[idim];
-               for(int jdim=idim; jdim<fNDim; jdim++) fdfdp[ipar++] = point[idim]*point[jdim];
-       }
-
-       // calculate estimation
-       result =0.; error = 0.;
-       for(int i=0; i<fLambda; i++){
-               result += fdfdp[i]*fPar[node](i);
-               for(int j=0; j<fLambda; j++) error += fdfdp[i]*fdfdp[j]*fCov[node](i,j);
-       }       
-       error = TMath::Sqrt(error);
-       printf("result[CookPDF] %6.3f +- %6.3f\n", result, error);
-
-       return 0.;
+  if(!fNodes){
+    Warning("TKDInterpolator::SetNode()", "Node array not defined.");
+    return kFALSE;
+  }
+  if(inode >= GetNTNodes()){
+    Warning("TKDInterpolator::SetNode()", "Node array defined up to %d.", GetNTNodes());
+    return kFALSE;
+  }
+  TKDNodeInfo *node = (TKDNodeInfo*)(*fNodes)[inode];
+  (*node) = ref;
+  return kTRUE;
 }