1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 // Author: ruben.shahoyan@cern.ch 09/09/2006
20 ////////////////////////////////////////////////////////////////////////////////
22 // AliCheb3D produces the interpolation of the user 3D->NDimOut arbitrary //
23 // function supplied in "void (*fcn)(float* inp,float* out)" format //
24 // either in a separate macro file or as a function pointer. //
25 // Only coefficients needed to guarantee the requested precision are kept. //
27 // The user-callable methods are: //
28 // To create the interpolation use: //
29 // AliCheb3D(const char* funName, // name of the file with user function //
31 // AliCheb3D(void (*ptr)(float*,float*),// pointer on the user function //
32 // Int_t DimOut, // dimensionality of the function's output //
33 // Float_t *bmin, // lower 3D bounds of interpolation domain //
34 // Float_t *bmax, // upper 3D bounds of interpolation domain //
35 // Int_t *npoints, // number of points in each of 3 input //
36 // // dimension, defining the interpolation grid //
37 // Float_t prec=1E-6); // requested max.absolute difference between //
38 // // the interpolation and any point on grid //
40 // To test obtained parameterization use the method //
41 // TH1* TestRMS(int idim,int npoints = 1000,TH1* histo=0); //
42 // it will compare the user output of the user function and interpolation //
43 // for idim-th output dimension and fill the difference in the supplied //
44 // histogram. If no histogram is supplied, it will be created. //
46 // To save the interpolation data: //
47 // SaveData(const char* filename, Bool_t append ) //
48 // write text file with data. If append is kTRUE and the output file already //
49 // exists, data will be added in the end of the file. //
50 // Alternatively, SaveData(FILE* stream) will write the data to //
51 // already existing stream. //
53 // To read back already stored interpolation use either the constructor //
54 // AliCheb3D(const char* inpFile); //
55 // or the default constructor AliCheb3D() followed by //
56 // AliCheb3D::LoadData(const char* inpFile); //
58 // To compute the interpolation use Eval(float* par,float *res) method, with //
59 // par being 3D vector of arguments (inside the validity region) and res is //
60 // the array of DimOut elements for the output. //
62 // If only one component (say, idim-th) of the output is needed, use faster //
63 // Float_t Eval(Float_t *par,int idim) method. //
65 // void Print(option="") will print the name, the ranges of validity and //
66 // the absolute precision of the parameterization. Option "l" will also print //
67 // the information about the number of coefficients for each output //
70 // NOTE: during the evaluation no check is done for parameter vector being //
71 // outside the interpolation region. If there is such a risk, use //
72 // Bool_t IsInside(float *par) method. Chebyshev parameterization is not //
73 // good for extrapolation! //
75 // For the properties of Chebyshev parameterization see: //
76 // H.Wind, CERN EP Internal Report, 81-12/Rev. //
78 ////////////////////////////////////////////////////////////////////////////////
84 #include "AliCheb3D.h"
89 ClassImp(AliCheb3DCalc)
92 AliCheb3DCalc::AliCheb3DCalc():
106 // Default constructor
110 AliCheb3DCalc::AliCheb3DCalc(FILE* stream):
124 // Default constructor
129 AliCheb3DCalc::AliCheb3DCalc(const AliCheb3DCalc& cheb):
147 void AliCheb3DCalc::Copy(TObject &) const
149 //dummy Copy function
150 AliFatal("Not implemented!");
153 //__________________________________________________________________________________________
154 void AliCheb3DCalc::Clear(Option_t*)
156 // delete all dynamycally allocated structures
157 if (fTmpCf1) { delete[] fTmpCf1; fTmpCf1 = 0;}
158 if (fTmpCf0) { delete[] fTmpCf0; fTmpCf0 = 0;}
159 if (fCoefs) { delete[] fCoefs; fCoefs = 0;}
160 if (fCoefBound2D0) { delete[] fCoefBound2D0; fCoefBound2D0 = 0; }
161 if (fCoefBound2D1) { delete[] fCoefBound2D1; fCoefBound2D1 = 0; }
162 if (fNColsAtRow) { delete[] fNColsAtRow; fNColsAtRow = 0; }
163 if (fColAtRowBg) { delete[] fColAtRowBg; fColAtRowBg = 0; }
167 //__________________________________________________________________________________________
168 void AliCheb3DCalc::Init0()
170 // reset everything to 0
171 fNCoefs = fNRows = fNCols = fNElemBound2D = 0;
173 fCoefBound2D0 = fCoefBound2D1 = 0;
174 fNColsAtRow = fColAtRowBg = 0;
175 fTmpCf0 = fTmpCf1 = 0;
178 //__________________________________________________________________________________________
179 void AliCheb3DCalc::Print(Option_t* ) const
181 printf("Chebyshev parameterization data %s for 3D->1 function.\n",GetName());
183 for (int i=fNElemBound2D;i--;) if (fCoefBound2D0[i]>nmax3d) nmax3d = fCoefBound2D0[i];
184 printf("%d coefficients in %dx%dx%d matrix\n",fNCoefs,fNRows,fNCols,nmax3d);
188 //__________________________________________________________________________________________
189 Float_t AliCheb3DCalc::Eval(Float_t *par) const
191 // evaluate Chebyshev parameterization for 3D function.
192 // VERY IMPORTANT: par must contain the function arguments ALREADY MAPPED to [-1:1] interval
198 for (int id0=fNRows;id0--;) {
199 int nCLoc = fNColsAtRow[id0]; // number of significant coefs on this row
200 int Col0 = fColAtRowBg[id0]; // beginning of local column in the 2D boundary matrix
201 for (int id1=nCLoc;id1--;) {
203 fTmpCf1[id1] = (ncfRC=fCoefBound2D0[id]) ? ChebEval1D(z,fCoefs + fCoefBound2D1[id], ncfRC) : 0.0;
205 fTmpCf0[id0] = nCLoc>0 ? ChebEval1D(y,fTmpCf1,nCLoc):0.0;
207 return ChebEval1D(x,fTmpCf0,fNRows);
211 //_______________________________________________
212 #ifdef _INC_CREATION_ALICHEB3D_
213 void AliCheb3DCalc::SaveData(const char* outfile,Bool_t append) const
215 // writes coefficients data to output text file, optionallt appending on the end of existing file
216 TString strf = outfile;
217 gSystem->ExpandPathName(strf);
218 FILE* stream = fopen(strf,append ? "a":"w");
225 //_______________________________________________
226 #ifdef _INC_CREATION_ALICHEB3D_
227 void AliCheb3DCalc::SaveData(FILE* stream) const
229 // writes coefficients data to existing output stream
230 // Note: fNCols, fNElemBound2D and fColAtRowBg is not stored, will be computed on fly during the loading of this file
231 fprintf(stream,"#\nSTART %s\n",GetName());
232 fprintf(stream,"# Number of rows\n%d\n",fNRows);
234 fprintf(stream,"# Number of columns per row\n");
235 for (int i=0;i<fNRows;i++) fprintf(stream,"%d\n",fNColsAtRow[i]);
237 fprintf(stream,"# Number of Coefs in each significant block of third dimension\n");
238 for (int i=0;i<fNElemBound2D;i++) fprintf(stream,"%d\n",fCoefBound2D0[i]);
240 fprintf(stream,"# Coefficients\n");
241 for (int i=0;i<fNCoefs;i++) fprintf(stream,"%+.8e\n",fCoefs[i]);
242 fprintf(stream,"END %s\n",GetName());
247 //_______________________________________________
248 void AliCheb3DCalc::LoadData(FILE* stream)
250 // Load coefs. from the stream
251 if (!stream) {Error("LoadData","No stream provided.\nStop"); exit(1);}
254 ReadLine(buffs,stream);
255 if (!buffs.BeginsWith("START")) {Error("LoadData","Expected: \"START <fit_name>\", found \"%s\"\nStop\n",buffs.Data());exit(1);}
256 if (buffs.First(' ')>0) SetName(buffs.Data()+buffs.First(' ')+1);
258 ReadLine(buffs,stream); // NRows
259 fNRows = buffs.Atoi();
260 if (fNRows<1) {Error("LoadData","Expected: '<number_of_rows>', found \"%s\"\nStop\n",buffs.Data());exit(1);}
266 for (int id0=0;id0<fNRows;id0++) {
267 ReadLine(buffs,stream); // n.cols at this row
268 fNColsAtRow[id0] = buffs.Atoi();
269 fColAtRowBg[id0] = fNElemBound2D; // begining of this row in 2D boundary surface
270 fNElemBound2D += fNColsAtRow[id0];
271 if (fNCols<fNColsAtRow[id0]) fNCols = fNColsAtRow[id0];
276 InitElemBound2D(fNElemBound2D);
278 for (int i=0;i<fNElemBound2D;i++) {
279 ReadLine(buffs,stream); // n.coeffs at 3-d dimension for the given column/row
280 fCoefBound2D0[i] = buffs.Atoi();
281 fCoefBound2D1[i] = fNCoefs;
282 fNCoefs += fCoefBound2D0[i];
285 if (fNCoefs<=0) {Error("LoadData","Negtive (%d) number of Chebychef coeffs. is obtained.\nStop\n",fNCoefs);exit(1);}
288 for (int i=0;i<fNCoefs;i++) {
289 ReadLine(buffs,stream);
290 fCoefs[i] = buffs.Atof();
292 // check end_of_data record
293 ReadLine(buffs,stream);
294 if (!buffs.BeginsWith("END") || !buffs.Contains(GetName())) {
295 Error("LoadData","Expected \"END %s\", found \"%s\".\nStop\n",GetName(),buffs.Data());
301 //_______________________________________________
302 void AliCheb3DCalc::ReadLine(TString& str,FILE* stream)
304 // read single line from the stream, skipping empty and commented lines. EOF is not expected
305 while (str.Gets(stream)) {
306 str = str.Strip(TString::kBoth,' ');
307 if (str.IsNull()||str.BeginsWith("#")) continue;
310 fprintf(stderr,"AliCheb3D::ReadLine: Failed to read from stream.\nStop");exit(1); // normally, should not reach here
313 //_______________________________________________
314 void AliCheb3DCalc::InitCols(int nc)
316 // Set max.number of significant columns in the coefs matrix
318 if (fTmpCf1) delete[] fTmpCf1;
319 fTmpCf1 = new Float_t [fNCols];
322 //_______________________________________________
323 void AliCheb3DCalc::InitRows(int nr)
325 // Set max.number of significant rows in the coefs matrix
326 if (fNColsAtRow) delete[] fNColsAtRow;
327 if (fColAtRowBg) delete[] fColAtRowBg;
328 if (fTmpCf0) delete[] fTmpCf0;
330 fNColsAtRow = new Int_t[fNRows];
331 fTmpCf0 = new Float_t [fNRows];
332 fColAtRowBg = new Int_t[fNRows];
333 for (int i=fNRows;i--;) fNColsAtRow[i] = fColAtRowBg[i] = 0;
336 //_______________________________________________
337 void AliCheb3DCalc::InitElemBound2D(int ne)
339 // Set max number of significant coefs for given row/column of coefs 3D matrix
340 if (fCoefBound2D0) delete[] fCoefBound2D0;
341 if (fCoefBound2D1) delete[] fCoefBound2D1;
343 fCoefBound2D0 = new Int_t[fNElemBound2D];
344 fCoefBound2D1 = new Int_t[fNElemBound2D];
345 for (int i=fNElemBound2D;i--;) fCoefBound2D0[i] = fCoefBound2D1[i] = 0;
348 //_______________________________________________
349 void AliCheb3DCalc::InitCoefs(int nc)
351 // Set total number of significant coefs
352 if (fCoefs) delete[] fCoefs;
354 fCoefs = new Float_t [fNCoefs];
355 for (int i=fNCoefs;i--;) fCoefs[i] = 0.0;
363 AliCheb3D::AliCheb3D():
374 // Default constructor
378 AliCheb3D::AliCheb3D(const char* inputFile):
389 // Default constructor
396 AliCheb3D::AliCheb3D(FILE* stream):
407 // Default constructor
412 AliCheb3D::AliCheb3D(const AliCheb3D& cheb):
427 //__________________________________________________________________________________________
428 #ifdef _INC_CREATION_ALICHEB3D_
429 AliCheb3D::AliCheb3D(const char* funName, int DimOut, Float_t *bmin,Float_t *bmax, Int_t *npoints, Float_t prec) : TNamed(funName,funName)
431 // Construct the parameterization for the function
432 // funName : name of the file containing the function: void funName(Float_t * inp,Float_t * out)
433 // DimOut : dimension of the vector computed by the user function
434 // bmin : array of 3 elements with the lower boundaries of the region where the function is defined
435 // bmax : array of 3 elements with the upper boundaries of the region where the function is defined
436 // npoints : array of 3 elements with the number of points to compute in each of 3 dimension
437 // prec : max allowed absolute difference between the user function and computed parameterization on the requested grid
440 fPrec = TMath::Max(1.E-12f,prec);
441 if (DimOut<1) {Error("AliCheb3D","Requested output dimension is %d\nStop\n",fDimOut); exit(1);}
443 PrepareBoundaries(bmin,bmax);
445 SetUsrFunction(funName);
451 //__________________________________________________________________________________________
452 #ifdef _INC_CREATION_ALICHEB3D_
453 AliCheb3D::AliCheb3D(void (*ptr)(float*,float*), int DimOut, Float_t *bmin,Float_t *bmax, Int_t *npoints, Float_t prec) : TNamed("AliCheb3D","AliCheb3D")
455 // Construct the parameterization for the function
456 // ptr : pointer on the function: void fun(Float_t * inp,Float_t * out)
457 // DimOut : dimension of the vector computed by the user function
458 // bmin : array of 3 elements with the lower boundaries of the region where the function is defined
459 // bmax : array of 3 elements with the upper boundaries of the region where the function is defined
460 // npoints : array of 3 elements with the number of points to compute in each of 3 dimension
461 // prec : max allowed absolute difference between the user function and computed parameterization on the requested grid
464 fPrec = TMath::Max(1.E-12f,prec);
465 if (DimOut<1) {Error("AliCheb3D","Requested output dimension is %d\nStop\n",fDimOut); exit(1);}
467 PrepareBoundaries(bmin,bmax);
476 void AliCheb3D::Copy(TObject &) const
478 //dummy Copy function
479 AliFatal("Not implemented!");
482 //__________________________________________________________________________________________
483 void AliCheb3D::Clear(Option_t*)
485 if (fResTmp) { delete[] fResTmp; fResTmp = 0; }
486 if (fGrid) { delete[] fGrid; fGrid = 0; }
487 if (fUsrMacro) { delete fUsrMacro; fUsrMacro = 0;}
492 //__________________________________________________________________________________________
493 void AliCheb3D::Print(Option_t* opt) const
495 printf("%s: Chebyshev parameterization for 3D->%dD function. Precision: %e\n",GetName(),fDimOut,fPrec);
496 printf("Region of validity: [%+.5e:%+.5e] [%+.5e:%+.5e] [%+.5e:%+.5e]\n",fBMin[0],fBMax[0],fBMin[1],fBMax[1],fBMin[2],fBMax[2]);
497 TString opts = opt; opts.ToLower();
498 if (opts.Contains("l")) for (int i=0;i<fDimOut;i++) {printf("Output dimension %d:\n",i+1); GetChebCalc(i)->Print();}
502 //__________________________________________________________________________________________
503 void AliCheb3D::Init0()
505 for (int i=3;i--;) fBMin[i] = fBMax[i] = fBScale[i] = fBOffset[i] = 0;
511 #ifdef _INC_CREATION_ALICHEB3D_
512 gUsrFunAliCheb3D = 0;
516 //__________________________________________________________________________________________
517 void AliCheb3D::PrepareBoundaries(Float_t *bmin,Float_t *bmax)
519 // Set and check boundaries defined by user, prepare coefficients for their conversion to [-1:1] interval
524 fBScale[i] = bmax[i]-bmin[i];
526 Error("PrepareBoundaries","Boundaries for %d-th dimension are not increasing: %+.4e %+.4e\nStop\n",i,fBMin[i],fBMax[i]);
529 fBOffset[i] = bmin[i] + fBScale[i]/2.0;
530 fBScale[i] = 2./fBScale[i];
535 //__________________________________________________________________________________________
536 #ifdef _INC_CREATION_ALICHEB3D_
537 void AliCheb3D::SetUsrFunction(const char* name)
539 // load user macro with function definition and compile it
540 gUsrFunAliCheb3D = 0;
542 gSystem->ExpandPathName(fUsrFunName);
543 if (fUsrMacro) delete fUsrMacro;
544 TString tmpst = fUsrFunName;
545 tmpst += "+"; // prepare filename to compile
546 if (gROOT->LoadMacro(tmpst.Data())) {Error("SetUsrFunction","Failed to load user function from %s\nStop\n",name); exit(1);}
547 fUsrMacro = new TMethodCall();
548 tmpst = tmpst.Data() + tmpst.Last('/')+1; //Strip away any path preceding the macro file name
549 int dot = tmpst.Last('.');
550 if (dot>0) tmpst.Resize(dot);
551 fUsrMacro->InitWithPrototype(tmpst.Data(),"Float_t *,Float_t *");
553 args[0] = (long)fArgsTmp;
554 args[1] = (long)fResTmp;
555 fUsrMacro->SetParamPtrs(args);
560 //__________________________________________________________________________________________
561 #ifdef _INC_CREATION_ALICHEB3D_
562 void AliCheb3D::SetUsrFunction(void (*ptr)(float*,float*))
564 if (fUsrMacro) delete fUsrMacro;
567 gUsrFunAliCheb3D = ptr;
571 //__________________________________________________________________________________________
572 #ifdef _INC_CREATION_ALICHEB3D_
573 void AliCheb3D::EvalUsrFunction(Float_t *x, Float_t *res) {
574 for (int i=3;i--;) fArgsTmp[i] = x[i];
575 if (gUsrFunAliCheb3D) gUsrFunAliCheb3D(fArgsTmp,fResTmp);
576 else fUsrMacro->Execute();
577 for (int i=fDimOut;i--;) res[i] = fResTmp[i];
581 //__________________________________________________________________________________________
582 #ifdef _INC_CREATION_ALICHEB3D_
583 Int_t AliCheb3D::CalcChebCoefs(Float_t *funval,int np, Float_t *outCoefs, Float_t prec)
585 // Calculate Chebyshev coeffs using precomputed function values at np roots.
586 // If prec>0, estimate the highest coeff number providing the needed precision
588 double sm; // do summations in double to minimize the roundoff error
589 for (int ic=0;ic<np;ic++) { // compute coeffs
591 for (int ir=0;ir<np;ir++) {
592 float rt = TMath::Cos( ic*(ir+0.5)*TMath::Pi()/np);
595 outCoefs[ic] = Float_t( sm * ((ic==0) ? 1./np : 2./np) );
598 if (prec<=0) return np;
602 for (cfMax=np;cfMax--;) {
603 sm += TMath::Abs(outCoefs[cfMax]);
606 if (++cfMax==0) cfMax=1;
612 //__________________________________________________________________________________________
613 #ifdef _INC_CREATION_ALICHEB3D_
614 void AliCheb3D::DefineGrid(Int_t* npoints)
616 // prepare the grid of Chebyshev roots in each dimension
617 const int kMinPoints = 1;
620 for (int id=3;id--;) {
621 fNPoints[id] = npoints[id];
622 if (fNPoints[id]<kMinPoints) {
623 Error("DefineGrid","at %d-th dimension %d point is requested, at least %d is needed\nStop\n",fNPoints[id],kMinPoints);
626 ntot += fNPoints[id];
627 fMaxCoefs *= fNPoints[id];
629 fGrid = new Float_t [ntot];
632 for (int id=3;id--;) {
633 int np = fNPoints[id];
634 fGridOffs[id] = curp;
635 for (int ip=0;ip<np;ip++) {
636 Float_t x = TMath::Cos( TMath::Pi()*(ip+0.5)/np );
637 fGrid[curp++] = MapToExternal(x,id);
644 //__________________________________________________________________________________________
645 #ifdef _INC_CREATION_ALICHEB3D_
646 Int_t AliCheb3D::ChebFit()
648 // prepare parameterization for all output dimensions
650 for (int i=fDimOut;i--;) ir+=ChebFit(i);
655 //__________________________________________________________________________________________
656 #ifdef _INC_CREATION_ALICHEB3D_
657 Int_t AliCheb3D::ChebFit(int dmOut)
659 // prepare paramaterization of 3D function for dmOut-th dimension
661 for (int i=0;i<3;i++) if (maxDim<fNPoints[i]) maxDim = fNPoints[i];
662 Float_t *fvals = new Float_t [ fNPoints[0] ];
663 Float_t *tmpCoef3D = new Float_t [ fNPoints[0]*fNPoints[1]*fNPoints[2] ];
664 Float_t *tmpCoef2D = new Float_t [ fNPoints[0]*fNPoints[1] ];
665 Float_t *tmpCoef1D = new Float_t [ maxDim ];
667 Float_t RTiny = fPrec/Float_t(maxDim); // neglect coefficient below this threshold
669 // 1D Cheb.fit for 0-th dimension at current steps of remaining dimensions
672 AliCheb3DCalc* cheb = GetChebCalc(dmOut);
674 for (int id2=fNPoints[2];id2--;) {
675 fArgsTmp[2] = fGrid[ fGridOffs[2]+id2 ];
677 for (int id1=fNPoints[1];id1--;) {
678 fArgsTmp[1] = fGrid[ fGridOffs[1]+id1 ];
680 for (int id0=fNPoints[0];id0--;) {
681 fArgsTmp[0] = fGrid[ fGridOffs[0]+id0 ];
682 EvalUsrFunction(); // compute function values at Chebyshev roots of 0-th dimension
683 fvals[id0] = fResTmp[dmOut];
685 int nc = CalcChebCoefs(fvals,fNPoints[0], tmpCoef1D, fPrec);
686 for (int id0=fNPoints[0];id0--;) tmpCoef2D[id1 + id0*fNPoints[1]] = tmpCoef1D[id0];
687 if (ncmax<nc) ncmax = nc; // max coefs to be kept in dim0 to guarantee needed precision
690 // once each 1d slice of given 2d slice is parametrized, parametrize the Cheb.coeffs
691 for (int id0=fNPoints[0];id0--;) {
692 CalcChebCoefs( tmpCoef2D+id0*fNPoints[1], fNPoints[1], tmpCoef1D, -1);
693 for (int id1=fNPoints[1];id1--;) tmpCoef3D[id2 + fNPoints[2]*(id1+id0*fNPoints[1])] = tmpCoef1D[id1];
697 // now fit the last dimensions Cheb.coefs
698 for (int id0=fNPoints[0];id0--;) {
699 for (int id1=fNPoints[1];id1--;) {
700 CalcChebCoefs( tmpCoef3D+ fNPoints[2]*(id1+id0*fNPoints[1]), fNPoints[2], tmpCoef1D, -1);
701 for (int id2=fNPoints[2];id2--;) tmpCoef3D[id2+ fNPoints[2]*(id1+id0*fNPoints[1])] = tmpCoef1D[id2]; // store on place
705 // now find 2D surface which separates significant coefficients of 3D matrix from nonsignificant ones (up to fPrec)
706 int *tmpCoefSurf = new Int_t[ fNPoints[0]*fNPoints[1] ];
707 for (int id0=fNPoints[0];id0--;) for (int id1=fNPoints[1];id1--;) tmpCoefSurf[id1+id0*fNPoints[1]]=0;
709 for (int id0=fNPoints[0];id0--;) {
710 for (int id1=fNPoints[1];id1--;) {
711 for (int id2=fNPoints[2];id2--;) {
712 int id = id2 + fNPoints[2]*(id1+id0*fNPoints[1]);
713 Float_t cfa = TMath::Abs(tmpCoef3D[id]);
714 if (cfa < RTiny) {tmpCoef3D[id] = 0; continue;} // neglect coeefs below the threshold
717 if (resid<fPrec) continue; // this coeff is negligible
718 // otherwise go back 1 step
720 tmpCoefSurf[id1+id0*fNPoints[1]] = id2+1; // how many coefs to keep
726 printf("\n\nCoeffs\n");
728 for (int id0=0;id0<fNPoints[0];id0++) {
729 for (int id1=0;id1<fNPoints[1];id1++) {
730 for (int id2=0;id2<fNPoints[2];id2++) {
731 printf("%2d%2d%2d %+.4e |",id0,id1,id2,tmpCoef3D[cnt++]);
738 // see if there are rows to reject, find max.significant column at each row
739 int NRows = fNPoints[0];
740 int *tmpCols = new int[NRows];
741 for (int id0=fNPoints[0];id0--;) {
742 int id1 = fNPoints[1];
743 while (id1>0 && tmpCoefSurf[(id1-1)+id0*fNPoints[1]]==0) id1--;
746 // find max significant row
747 for (int id0=NRows;id0--;) {if (tmpCols[id0]>0) break; NRows--;}
748 // find max significant column and fill the permanent storage for the max sigificant column of each row
749 cheb->InitRows(NRows); // create needed arrays;
750 int *NColsAtRow = cheb->GetNColsAtRow();
751 int *ColAtRowBg = cheb->GetColAtRowBg();
753 int NElemBound2D = 0;
754 for (int id0=0;id0<NRows;id0++) {
755 NColsAtRow[id0] = tmpCols[id0]; // number of columns to store for this row
756 ColAtRowBg[id0] = NElemBound2D; // begining of this row in 2D boundary surface
757 NElemBound2D += tmpCols[id0];
758 if (NCols<NColsAtRow[id0]) NCols = NColsAtRow[id0];
760 cheb->InitCols(NCols);
763 // create the 2D matrix defining the boundary of significance for 3D coeffs.matrix
764 // and count the number of siginifacnt coefficients
766 cheb->InitElemBound2D(NElemBound2D);
767 int *CoefBound2D0 = cheb->GetCoefBound2D0();
768 int *CoefBound2D1 = cheb->GetCoefBound2D1();
769 fMaxCoefs = 0; // redefine number of coeffs
770 for (int id0=0;id0<NRows;id0++) {
771 int nCLoc = NColsAtRow[id0];
772 int Col0 = ColAtRowBg[id0];
773 for (int id1=0;id1<nCLoc;id1++) {
774 CoefBound2D0[Col0 + id1] = tmpCoefSurf[id1+id0*fNPoints[1]]; // number of coefs to store for 3-d dimension
775 CoefBound2D1[Col0 + id1] = fMaxCoefs;
776 fMaxCoefs += CoefBound2D0[Col0 + id1];
780 // create final compressed 3D matrix for significant coeffs
781 cheb->InitCoefs(fMaxCoefs);
782 Float_t *Coefs = cheb->GetCoefs();
784 for (int id0=0;id0<NRows;id0++) {
785 int ncLoc = NColsAtRow[id0];
786 int Col0 = ColAtRowBg[id0];
787 for (int id1=0;id1<ncLoc;id1++) {
788 int ncf2 = CoefBound2D0[Col0 + id1];
789 for (int id2=0;id2<ncf2;id2++) {
790 Coefs[count++] = tmpCoef3D[id2 + fNPoints[2]*(id1+id0*fNPoints[1])];
795 printf("\n\nNewSurf\n");
796 for (int id0=0;id0<fNPoints[0];id0++) {
797 for (int id1=0;id1<fNPoints[1];id1++) {
798 printf("(%2d %2d) %2d |",id0,id1,tmpCoefSurf[id1+id0*fNPoints[1]]);
804 delete[] tmpCoefSurf;
814 //_______________________________________________
815 #ifdef _INC_CREATION_ALICHEB3D_
816 void AliCheb3D::SaveData(const char* outfile,Bool_t append) const
818 // writes coefficients data to output text file, optionallt appending on the end of existing file
819 TString strf = outfile;
820 gSystem->ExpandPathName(strf);
821 FILE* stream = fopen(strf,append ? "a":"w");
828 //_______________________________________________
829 #ifdef _INC_CREATION_ALICHEB3D_
830 void AliCheb3D::SaveData(FILE* stream) const
832 // writes coefficients data to existing output stream
834 fprintf(stream,"\n# These are automatically generated data for the Chebyshev interpolation of 3D->%dD function\n",fDimOut);
835 fprintf(stream,"#\nSTART %s\n",GetName());
836 fprintf(stream,"# Dimensionality of the output\n%d\n",fDimOut);
837 fprintf(stream,"# Interpolation abs. precision\n%+.8e\n",fPrec);
839 fprintf(stream,"# Lower boundaries of interpolation region\n");
840 for (int i=0;i<3;i++) fprintf(stream,"%+.8e\n",fBMin[i]);
841 fprintf(stream,"# Upper boundaries of interpolation region\n");
842 for (int i=0;i<3;i++) fprintf(stream,"%+.8e\n",fBMax[i]);
843 fprintf(stream,"# Parameterization for each output dimension follows:\n",GetName());
845 for (int i=0;i<fDimOut;i++) GetChebCalc(i)->SaveData(stream);
846 fprintf(stream,"#\nEND %s\n#\n",GetName());
851 //_______________________________________________
852 void AliCheb3D::LoadData(const char* inpFile)
854 TString strf = inpFile;
855 gSystem->ExpandPathName(strf);
856 FILE* stream = fopen(strf.Data(),"r");
862 //_______________________________________________
863 void AliCheb3D::LoadData(FILE* stream)
865 if (!stream) {Error("LoadData","No stream provided.\nStop"); exit(1);}
868 AliCheb3DCalc::ReadLine(buffs,stream);
869 if (!buffs.BeginsWith("START")) {Error("LoadData","Expected: \"START <fit_name>\", found \"%s\"\nStop\n",buffs.Data());exit(1);}
870 SetName(buffs.Data()+buffs.First(' ')+1);
872 AliCheb3DCalc::ReadLine(buffs,stream); // N output dimensions
873 fDimOut = buffs.Atoi();
874 if (fDimOut<1) {Error("LoadData","Expected: '<number_of_output_dimensions>', found \"%s\"\nStop\n",buffs.Data());exit(1);}
878 AliCheb3DCalc::ReadLine(buffs,stream); // Interpolation abs. precision
879 fPrec = buffs.Atof();
880 if (fPrec<=0) {Error("LoadData","Expected: '<abs.precision>', found \"%s\"\nStop\n",buffs.Data());exit(1);}
882 for (int i=0;i<3;i++) { // Lower boundaries of interpolation region
883 AliCheb3DCalc::ReadLine(buffs,stream);
884 fBMin[i] = buffs.Atof();
886 for (int i=0;i<3;i++) { // Upper boundaries of interpolation region
887 AliCheb3DCalc::ReadLine(buffs,stream);
888 fBMax[i] = buffs.Atof();
890 PrepareBoundaries(fBMin,fBMax);
892 // data for each output dimension
893 for (int i=0;i<fDimOut;i++) GetChebCalc(i)->LoadData(stream);
895 // check end_of_data record
896 AliCheb3DCalc::ReadLine(buffs,stream);
897 if (!buffs.BeginsWith("END") || !buffs.Contains(GetName())) {
898 Error("LoadData","Expected \"END %s\", found \"%s\".\nStop\n",GetName(),buffs.Data());
904 //_______________________________________________
905 void AliCheb3D::SetDimOut(int d)
908 if (fResTmp) delete fResTmp;
909 fResTmp = new Float_t[fDimOut]; // RRR
911 for (int i=0;i<d;i++) fChebCalc.AddAtAndExpand(new AliCheb3DCalc(),i);
914 //_______________________________________________
915 void AliCheb3D::ShiftBound(int id,float dif)
917 if (id<0||id>2) {printf("Maximum 3 dimensions are supported\n"); return;}
923 //_______________________________________________
924 #ifdef _INC_CREATION_ALICHEB3D_
925 TH1* AliCheb3D::TestRMS(int idim,int npoints,TH1* histo)
927 // fills the difference between the original function and parameterization (for idim-th component of the output)
928 // to supplied histogram. Calculations are done in npoints random points.
929 // If the hostgram was not supplied, it will be created. It is up to the user to delete it!
931 printf("No user function is set\n");
934 if (!histo) histo = new TH1D(GetName(),"Control: Function - Parametrization",100,-2*fPrec,2*fPrec);
935 for (int ip=npoints;ip--;) {
936 gRandom->RndmArray(3,(Float_t *)fArgsTmp);
937 for (int i=3;i--;) fArgsTmp[i] = fBMin[i] + fArgsTmp[i]*(fBMax[i]-fBMin[i]);
939 Float_t valFun = fResTmp[idim];
940 Eval(fArgsTmp,fResTmp);
941 Float_t valPar = fResTmp[idim];
942 histo->Fill(valFun - valPar);