Keep track of missing DCS points in DDL maps (flagged by 'x')
[u/mrichter/AliRoot.git] / STAT / TKDInterpolator.cxx
index 1d64336..31d846a 100644 (file)
 #include "TKDInterpolator.h"
+#include "TKDNodeInfo.h"
 
-#include "TLinearFitter.h"
-#include "TTree.h"
-#include "TH2.h"
-#include "TObjArray.h"
-#include "TObjString.h"
-#include "TBox.h"
-#include "TGraph.h"
-#include "TMarker.h"
-#include "TVectorD.h"
-#include "TMatrixD.h"
+#include "TError.h"
+#include "TClonesArray.h"
 
 ClassImp(TKDInterpolator)
-ClassImp(TKDInterpolator::TKDNodeInfo)
 
-/////////////////////////////////////////////////////////////////////
-// Memory setup of protected data members
-// 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::TKDNodeInfo::TKDNodeInfo(const Int_t dim): 
-       fNDim(dim)
-       ,fRefPoint(0x0)
-       ,fRefValue(0.)
-       ,fCov(0x0)
-       ,fPar(0x0)
-{
-       if(fNDim) Build(dim);
-}
-
-//_________________________________________________________________
-TKDInterpolator::TKDNodeInfo::~TKDNodeInfo()
-{
-       if(fRefPoint) delete [] fRefPoint;
-       if(fCov){
-               delete fPar;
-               delete fCov;
-       }
-}
-
-//_________________________________________________________________
-void TKDInterpolator::TKDNodeInfo::Build(const Int_t dim)
-{
-// Allocate/Reallocate space for this node.
-
-       if(!dim) return;
-
-       fNDim = dim;
-       Int_t lambda = Int_t(1 + fNDim + .5*fNDim*(fNDim+1));
-       if(fRefPoint) delete [] fRefPoint;
-       fRefPoint = new Float_t[fNDim];
-       if(fCov){
-               fCov->ResizeTo(lambda, lambda);
-               fPar->ResizeTo(lambda);
-       }
-       return;
-}
-
-//_________________________________________________________________
-void TKDInterpolator::TKDNodeInfo::Store(const TVectorD &par, const TMatrixD &cov)
-{
-       if(!fCov){
-               fCov = new TMatrixD(cov.GetNrows(), cov.GetNrows());
-               fPar = new TVectorD(par.GetNrows());
-       }
-       (*fPar) = par;
-       (*fCov) = cov;
-}
 
 //_________________________________________________________________
-Double_t TKDInterpolator::TKDNodeInfo::CookPDF(const Double_t *point, Double_t &result, Double_t &error)
-{
-// Recalculate the PDF for one node from the results of interpolation (parameters and covariance matrix)
-
-       if(fNDim>10) return 0.; // support only up to 10 dimensions
-       
-       Int_t lambda = 1 + fNDim + (fNDim*(fNDim+1)>>1);
-       Double_t fdfdp[66];
-       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<lambda; i++){
-               result += fdfdp[i]*(*fPar)(i);
-               for(int j=0; j<lambda; j++) error += fdfdp[i]*fdfdp[j]*(*fCov)(i,j);
-       }       
-       error = TMath::Sqrt(error);
-       
-       //printf("TKDNodeInfo::CookPDF() : %6.3f +- %6.3f\n", result, error);
-
-       return 0.;
-}
-
-
-//_________________________________________________________________
-TKDInterpolator::TKDInterpolator() : TKDTreeIF()
-       ,fNTNodes(0)
-       ,fTNodes(0x0)
-       ,fStatus(4)
-       ,fLambda(0)
-       ,fDepth(-1)
-       ,fAlpha(.5)
-       ,fRefPoints(0x0)
-       ,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(GetNTNodes())
-       ,fTNodes(0x0)
-       ,fStatus(4)
-       ,fLambda(0)
-       ,fDepth(-1)
-       ,fAlpha(.5)
-       ,fRefPoints(0x0)
-       ,fBuffer(0x0)
-       ,fKDhelper(0x0)
-       ,fFitter(0x0)
+TKDInterpolator::TKDInterpolator(Int_t ndim, Int_t npoints) :
+  TKDInterpolatorBase(ndim)
 {
 // Wrapper constructor for the TKDTree.
 
-       Build();
+  if(npoints) TKDInterpolatorBase::Build(npoints);
 }
 
 
 //_________________________________________________________________
-TKDInterpolator::TKDInterpolator(TTree *t, const Char_t *var, const Char_t *cut, UInt_t bsize, Long64_t nentries, Long64_t firstentry) : TKDTreeIF()
-       ,fNTNodes(0)
-       ,fTNodes(0x0)
-       ,fStatus(4)
-       ,fLambda(0)
-       ,fDepth(-1)
-       ,fAlpha(.5)
-       ,fRefPoints(0x0)
-       ,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();
-       Build();
-}
-
-//_________________________________________________________________
 TKDInterpolator::~TKDInterpolator()
 {
-       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(fTNodes) delete [] fTNodes;
 }
 
 //_________________________________________________________________
-void TKDInterpolator::Build()
+void TKDInterpolator::AddNode(const TKDNodeInfo &node)
 {
-// Fill interpolator's data array i.e.
-//  - estimation points 
-//  - corresponding PDF values
-
-       fNTNodes = TKDTreeIF::GetNTNodes();
-       if(!fBoundaries) MakeBoundaries();
-       fLambda = 1 + fNDim + (fNDim*(fNDim+1)>>1);
-       //printf("after MakeBoundaries() %d\n", memory());
-       
-       // allocate memory for data
-       fTNodes = new TKDNodeInfo[fNTNodes];
-       for(int in=0; in<fNTNodes; in++) fTNodes[in].Build(fNDim);
-       //printf("after BuildNodes() %d\n", memory());
-
-       Float_t *bounds = 0x0;
-       Int_t *indexPoints;
-       for(int inode=0, tnode = fNnodes; inode<fNTNodes-1; inode++, tnode++){
-               fTNodes[inode].fRefValue =  Float_t(fBucketSize)/fNpoints;
-               bounds = GetBoundary(tnode);
-               for(int idim=0; idim<fNDim; idim++) fTNodes[inode].fRefValue /= (bounds[2*idim+1] - bounds[2*idim]);
-               
-               indexPoints = GetPointsIndexes(tnode);
-               // loop points in this terminal node
-               for(int idim=0; idim<fNDim; idim++){
-                       fTNodes[inode].fRefPoint[idim] = 0.;
-                       for(int ip = 0; ip<fBucketSize; ip++){
-/*                             printf("\t\tindex[%d] = %d %f\n", ip, indexPoints[ip], fData[idim][indexPoints[ip]]);*/
-                               fTNodes[inode].fRefPoint[idim] += fData[idim][indexPoints[ip]];
-                       }
-                       fTNodes[inode].fRefPoint[idim] /= fBucketSize;
-               }
-       }
-
-       // analyze last (incomplete) terminal node
-       Int_t counts = fNpoints%fBucketSize;
-       counts = counts ? counts : fBucketSize;
-       Int_t inode = fNTNodes - 1, tnode = inode + fNnodes;
-       fTNodes[inode].fRefValue =  Float_t(counts)/fNpoints;
-       bounds = GetBoundary(tnode);
-       for(int idim=0; idim<fNDim; idim++) fTNodes[inode].fRefValue /= (bounds[2*idim+1] - bounds[2*idim]);
+  if(!fNodes){
+    Warning("TKDInterpolator::SetNode()", "Node array not defined.");
+    return;
+  }
 
-       // loop points in this terminal node
-       indexPoints = GetPointsIndexes(tnode);
-       for(int idim=0; idim<fNDim; idim++){
-               fTNodes[inode].fRefPoint[idim] = 0.;
-               for(int ip = 0; ip<counts; ip++) fTNodes[inode].fRefPoint[idim] += fData[idim][indexPoints[ip]];
-               fTNodes[inode].fRefPoint[idim] /= counts;
-       }
-}
-
-//__________________________________________________________________
-void TKDInterpolator::GetStatus()
-{
-// Prints the status of the interpolator
-
-       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");
-       return;
-       
-       printf("fNTNodes %d\n", fNTNodes);        //Number of evaluation data points
-       for(int i=0; i<fNTNodes; i++){
-               printf("%d ", i);
-               for(int idim=0; idim<fNDim; idim++) printf("%f ", fTNodes[i].fRefPoint[idim]);
-               printf("[%f] %s\n", fTNodes[i].fRefValue, fTNodes[i].fCov ? "true" : "false");
-               printf("Fit parameters : ");
-               if(!fTNodes[i].fPar){
-                       printf("Not defined.\n");
-                       continue;
-               }
-               for(int ip=0; ip<3; ip++) printf("p%d[%f] ", ip, (*fTNodes[i].fPar)(ip));
-               printf("\n");
-       }
+  Int_t n(GetNTNodes());
+  new((*fNodes)[n++]) TKDNodeInfo(node);
 }
 
 //_________________________________________________________________
-Double_t TKDInterpolator::Eval(const Double_t *point, Double_t &result, Double_t &error, Bool_t force)
+Bool_t TKDInterpolator::Build(Int_t npoints, Int_t ndim)
 {
-// 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((fStatus&1) && fTNodes[node].fCov && !force) return fTNodes[node].CookPDF(point, result, error);
-
-       // Allocate memory
-       if(!fBuffer) fBuffer = new Double_t[2*fLambda];
-       if(!fKDhelper){ 
-               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] = fTNodes[in].fRefPoint[id];
-               }
-//             for(int in=0; in<fNTNodes; in++){
-//                     printf("%3d ", in);
-//                     for(int id=0; id<fNDim; id++) printf("%6.3f ", fTNodes[in].fRefPoint[id]/*fRefPoints[id][in]*/);
-//                     printf("\n");
-//             }
-               fKDhelper = new TKDTreeIF(fNTNodes, fNDim, 30, fRefPoints);
-               fKDhelper->MakeBoundaries();
-       }
-       if(!fFitter) fFitter = new TLinearFitter(fLambda, Form("hyp%d", fLambda-1));
-       
-       // 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.+fAlpha)*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();
-               TKDNodeInfo *node = 0x0;
-               for(int in=0; in<npoints; in++){
-                       node = &fTNodes[index[in]];
-                       if(fStatus&1){ // INT
-                               Float_t *bounds = GetBoundary(FindNode(node->fRefPoint));
-                               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
-                               Float_t *p = node->fRefPoint;
-                               ipar = 0;
-                               for(int idim=0; idim<fNDim; idim++){
-                                       fBuffer[ipar++] = p[idim];
-                                       for(int jdim=idim; jdim<fNDim; jdim++) fBuffer[ipar++] = p[idim]*p[jdim];
-                               }
-                       }
-
-                       // 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, node->fRefValue, node->fRefValue*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) fTNodes[node].Store(par, cov);
-               
-       // 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;
+  fNSize = ndim;
+  return TKDInterpolatorBase::Build(npoints);
 }
 
 //_________________________________________________________________
-void TKDInterpolator::DrawNodes(UInt_t ax1, UInt_t ax2, Int_t depth)
+Int_t TKDInterpolator::GetNodeIndex(const Float_t *p)
 {
-// 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 = 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 kBorder = 0.;//1.E-4;
-       TBox *nodeArray = 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 = &nodeArray[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+inode/*Int_t(gRandom->Uniform()*50.)*/);
-               bounds = GetBoundary(inode);
-               node->DrawBox(bounds[2*ax1]+kBorder, bounds[2*ax2]+kBorder, bounds[2*ax1+1]-kBorder, bounds[2*ax2+1]-kBorder);
-       }
-       if(depth != -1) return;
+//     printf("TKDInterpolator::GetNodeIndex() ...\n");
+//   printf("Looking for p[");
+//   for(int i=0; i<fNSize; i++) printf("%f ", p[i]);
+//   printf("] ...\n");
 
-       // Draw reference points
-       TGraph *ref = new TGraph(fNTNodes);
-       ref->SetMarkerStyle(3);
-       ref->SetMarkerSize(.7);
-       ref->SetMarkerColor(2);
-       for(int inode = 0; inode < fNTNodes; inode++) ref->SetPoint(inode, fTNodes[inode].fRefPoint[ax1], fTNodes[inode].fRefPoint[ax2]);
-       ref->Draw("p");
-       return;
-}
-
-//_________________________________________________________________
-void TKDInterpolator::DrawNode(Int_t tnode, UInt_t ax1, UInt_t ax2)
-{
-// 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 >= fNTNodes){
-               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(fTNodes[inode].fRefPoint[ax1], fTNodes[inode].fRefPoint[ax2], 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);
-
-       g->Draw("ap");
-       m->Draw();
-       n->Draw();
-       
-       return;
-}
-
-
-//__________________________________________________________________
-void TKDInterpolator::SetInterpolationMethod(const Bool_t on)
-{
-// Set interpolation bit to "on".
-       
-       if(on) fStatus += fStatus&1 ? 0 : 1;
-       else fStatus += fStatus&1 ? -1 : 0;
+  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;
 }
 
 
 //_________________________________________________________________
-void TKDInterpolator::SetStore(const Bool_t on)
+Bool_t TKDInterpolator::SetNode(Int_t inode, const TKDNodeInfo &ref)
 {
-// Set store bit to "on"
-       
-       if(on) fStatus += fStatus&2 ? 0 : 2;
-       else fStatus += fStatus&2 ? -2 : 0;
+  if(!fNodes){
+    Warning("TKDInterpolator::SetNode()", "Node array not defined.");
+    return kFALSE;
+  }
+  if(inode >= GetNTNodes()){
+    Warning("TKDInterpolator::SetNode()", Form("Node array defined up to %d.", GetNTNodes()));
+    return kFALSE;
+  }
+  TKDNodeInfo *node = (TKDNodeInfo*)(*fNodes)[inode];
+  (*node) = ref;
+  return kTRUE;
 }
 
-//_________________________________________________________________
-void TKDInterpolator::SetWeights(const Bool_t on)
-{
-// Set weights bit to "on"
-       
-       if(on) fStatus += fStatus&4 ? 0 : 4;
-       else fStatus += fStatus&4 ? -4 : 0;
-}