possiblity to read ESD friends (Jacek)
[u/mrichter/AliRoot.git] / STAT / TKDInterpolator.cxx
index 88bce8a..2abe0d1 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 "TBox.h"
-#include "TGraph.h"
-#include "TMarker.h"
-
-
+#include "TClonesArray.h"
 
 ClassImp(TKDInterpolator)
 
-/////////////////////////////////////////////////////////////////////
-// 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) | ...
-/////////////////////////////////////////////////////////////////////
 
-//_________________________________________________________________
-TKDInterpolator::TKDInterpolator() : TKDTreeIF()
-       ,fNTNodes(0)
-       ,fRefPoints(0x0)
-       ,fRefValues(0x0)
-       ,fDepth(-1)
-       ,fTmpPoint(0x0)
-       ,fKDhelper(0x0)
-       ,fFitter(0x0)
-{
-}
 
 //_________________________________________________________________
-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)
-       ,fDepth(-1)
-       ,fTmpPoint(0x0)
-       ,fKDhelper(0x0)
-       ,fFitter(0x0)
+TKDInterpolator::TKDInterpolator() :
+       TKDInterpolatorBase()
 {
-       Build();
+// Default constructor. To be used with care since in this case building
+// of data structure is completly left to the user responsability.
 }
 
-
 //_________________________________________________________________
-TKDInterpolator::TKDInterpolator(TTree *t, const Char_t *var, const Char_t *cut, UInt_t bsize) : TKDTreeIF()
-       ,fNTNodes(0)
-       ,fRefPoints(0x0)
-       ,fRefValues(0x0)
-       ,fDepth(-1)
-       ,fTmpPoint(0x0)
-       ,fKDhelper(0x0)
-       ,fFitter(0x0)
+TKDInterpolator::TKDInterpolator(Int_t ndim, Int_t npoints) :
+       TKDInterpolatorBase(ndim)
 {
-// 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().
-//
-// 
-
-       fNpoints = t->GetEntriesFast();
-       TObjArray *vars = TString(var).Tokenize(":");
-       fNDim = vars->GetEntriesFast();
-       if(fNDim > 6/*kDimMax*/) Warning("TKDInterpolator(TTree*, UInt_t, const Char_t)", Form("Variable number exceed maximum dimension %d. Results are unpredictable.", 6/*kDimMax*/));
-       fBucketSize = bsize;
+// Wrapper constructor for the TKDTree.
 
-       printf("Allocating %d points in %d dimensions.\n", fNpoints, fNDim);
-       Float_t *mem = new Float_t[fNDim*fNpoints];
-       fData = new Float_t*[fNDim];
-       for(int idim=0; idim<fNDim; idim++) fData[idim] = &mem[idim*fNpoints];
-       kDataOwner = kTRUE;
-       
-       Double_t *v;
-       for(int idim=0; idim<fNDim; idim++){
-               if(!(t->Draw(((TObjString*)(*vars)[idim])->GetName(), cut, "goff"))){
-                       Warning("TKDInterpolator(TTree*, UInt_t, const Char_t)", Form("Can not access data for %s", ((TObjString*)(*vars)[idim])->GetName() ));
-                       continue;
-               }
-               v = t->GetV1();
-               for(int ip=0; ip<fNpoints; ip++) fData[idim][ip] = (Float_t)v[ip];
-       }
-       TKDTreeIF::Build();
-       fNTNodes = GetNTerminalNodes();
-       Build();
+       if(npoints) TKDInterpolatorBase::Build(npoints);
 }
 
+
 //_________________________________________________________________
 TKDInterpolator::~TKDInterpolator()
 {
-       if(fFitter) delete fFitter;
-       if(fKDhelper) delete fKDhelper;
-       if(fTmpPoint) delete [] fTmpPoint;
-       
-       if(fRefPoints){
-               for(int idim=0; idim<fNDim; idim++) delete [] fRefPoints[idim] ;
-               delete [] fRefPoints;
-       }
-       if(fRefValues) delete [] fRefValues;
 }
 
 //_________________________________________________________________
-void TKDInterpolator::Build()
+void TKDInterpolator::AddNode(const TKDNodeInfo &node)
 {
-       if(!fBoundaries) MakeBoundaries();
-       
-       // 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.;
-       }
-
-       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;
-               }
+       if(!fTNodes){
+               printf("W - TKDInterpolator::SetNode() : Node array not defined.\n");
+               return;
        }
 
-       // 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;
-       }
+       new((*fTNodes)[fNTNodes++]) TKDNodeInfo(node);
 }
 
 //_________________________________________________________________
-Double_t TKDInterpolator::Eval(Float_t *point)
+void TKDInterpolator::Build(Int_t npoints, Int_t ndim)
 {
-
-       // calculate number of parameters in the parabolic expresion
-       Int_t kNN = 1 + fNDim + fNDim*(fNDim+1)/2;
-
-       // prepare workers
-       if(!fTmpPoint) fTmpPoint = new Double_t[fNDim];
-       if(!fKDhelper) fKDhelper = new TKDTreeIF(GetNTerminalNodes(), fNDim, kNN, fRefPoints);
-       if(!fFitter){
-               // generate formula for nD
-               TString 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);
-               }
-               fFitter = new TLinearFitter(kNN, formula.Data());
-       }
-       
-       Int_t kNN_old = 0;
-       Int_t *index;
-       Float_t dist;
-       fFitter->ClearPoints();
-       do{
-               if(!fKDhelper->FindNearestNeighbors(point, kNN, index, dist)){
-                       Error("Eval()", Form("Failed retriving %d neighbours for point:", kNN));
-                       for(int idim=0; idim<fNDim; idim++) printf("%f ", point[idim]);
-                       printf("\n");
-                       return -1;
-               }
-               for(int in=kNN_old; in<kNN; in++){
-                       for(int idim=0; idim<fNDim; idim++) fTmpPoint[idim] = fRefPoints[idim][index[in]];
-                       fFitter->AddPoint(fTmpPoint, TMath::Log(fRefValues[index[in]]), 1.);
-               }
-               kNN_old = kNN;
-               kNN += 4;
-       } while(fFitter->Eval());
-
-       // calculate evaluation
-       TVectorD par(kNN);
-       fFitter->GetParameters(par);
-       Double_t result = par[0];
-       Int_t ipar = 0;
-       for(int idim=0; idim<fNDim; idim++){
-               result += par[++ipar]*point[idim];
-               for(int jdim=idim; jdim<fNDim; jdim++) result += par[++ipar]*point[idim]*point[jdim];
-       }
-       return TMath::Exp(result);
+       fNSize = ndim;
+       TKDInterpolatorBase::Build(npoints);
 }
 
-
 //_________________________________________________________________
-void TKDInterpolator::DrawNodes(Int_t depth, Int_t ax1, Int_t ax2)
+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)
-
-       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("TKDInterpolator::GetNodeIndex() ...\n");
+       printf("Looking for p[");
+       for(int i=0; i<fNSize; i++) printf("%f ", p[i]);
+       printf("] ...\n");*/
+       TKDNodeInfo *node;
+       for(int inode=0; inode<fNTNodes; inode++){
+               node = (TKDNodeInfo*)(*fTNodes)[inode];
+               //node->Print();
+               if(node->Has(p)) return inode;
        }
-
-       //printf("depth %d nodes %d\n", depth, nnodes);
-       
-       //TH2 *h2 = new TH2S("hframe", "", 100, fRange[2*ax1], fRange[2*ax1+1], 100, fRange[2*ax2], fRange[2*ax2+1]);
-       TH2 *h2 = new TH2S("hframe", "", 100, 0., 1., 100, 0., 1.);
-       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++];
-               bounds = GetBoundary(inode);
-               node = new TBox(bounds[2*ax1]+border, bounds[2*ax2]+border, bounds[2*ax1+1]-border, bounds[2*ax2+1]-border);
-               node->SetFillStyle(0);  
-               node->SetFillColor(51+inode);
-               node->Draw();
-       }
-       if(depth != -1) return;
-
-       // Draw reference points
-       TGraph *ref = new TGraph(GetNTerminalNodes());
-       ref->SetMarkerStyle(2);
-       ref->SetMarkerColor(2);
-       Float_t val, error;
-       for(int inode = 0; inode < GetNTerminalNodes(); inode++) ref->SetPoint(inode, fRefPoints[ax1][inode], fRefPoints[ax2][inode]);
-       ref->Draw("p");
-       return;
+       return -1;
 }
 
+
 //_________________________________________________________________
-void TKDInterpolator::DrawNode(Int_t tnode, Int_t ax1, Int_t ax2)
+Bool_t TKDInterpolator::SetNode(Int_t inode, const TKDNodeInfo &ref)
 {
-// Draw node "node" and the data points within.
-
-       if(tnode < 0 || tnode >= GetNTerminalNodes()){
-               Warning("DrawNode()", Form("Terminal node %d outside defined range.", tnode));
-               return;
+       if(!fTNodes){
+               printf("W - TKDInterpolator::SetNode() : Node array not defined.\n");
+               return kFALSE;
        }
-
-       //TH2 *h2 = new TH2S("hframe", "", 1, fRange[2*ax1], fRange[2*ax1+1], 1, fRange[2*ax2], fRange[2*ax2+1]);
-       TH2 *h2 = new TH2S("hframe", "", 1, 0., 1., 1, 0., 1.);
-       h2->Draw();
-
-       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;
-
-       printf("true index %d points %d\n", tnode, nPoints);
-
-       // draw data points
-       TGraph *g = new TGraph(nPoints);
-       g->SetMarkerStyle(3);
-       g->SetMarkerSize(.8);
-       for(int ip = 0; ip<nPoints; ip++) g->SetPoint(ip, fData[ax1][index[ip]], fData[ax2][index[ip]]);
-       g->Draw("p");
-
-       // draw estimation point
-       TMarker *m=new TMarker(fRefPoints[ax1][inode], fRefPoints[ax2][inode], 2);
-       m->SetMarkerColor(2);
-       m->Draw();
-       
-       // 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);
-       n->Draw();
-       
-       return;
+       if(inode >= fNTNodes){
+               printf("W - TKDInterpolator::SetNode() : Node array defined up to %d.\n", fNTNodes);
+               return kFALSE;
+       }
+       TKDNodeInfo *node = (TKDNodeInfo*)(*fTNodes)[inode];
+       (*node) = ref;
+       return kTRUE;
 }