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 **************************************************************************/
21 #include <TMethodCall.h>
24 #include "AliCheb3D.h"
25 #include "AliCheb3DCalc.h"
30 const Float_t AliCheb3D::fgkMinPrec = 1.e-12f;
32 //__________________________________________________________________________________________
33 AliCheb3D::AliCheb3D() :
43 // Default constructor
45 fBMin[i] = fBMax[i] = fBScale[i] = fBOffset[i] = fArgsTmp[i] = 0;
51 //__________________________________________________________________________________________
52 AliCheb3D::AliCheb3D(const AliCheb3D& src) :
57 fMaxCoefs(src.fMaxCoefs),
60 fUsrFunName(src.fUsrFunName),
63 // read coefs from text file
65 fBMin[i] = src.fBMin[i];
66 fBMax[i] = src.fBMax[i];
67 fBScale[i] = src.fBScale[i];
68 fBOffset[i] = src.fBOffset[i];
69 fNPoints[i] = src.fNPoints[i];
70 fGridOffs[i] = src.fGridOffs[i];
73 for (int i=0;i<fDimOut;i++) {
74 AliCheb3DCalc* cbc = src.GetChebCalc(i);
75 if (cbc) fChebCalc.AddAtAndExpand(new AliCheb3DCalc(*cbc),i);
79 //__________________________________________________________________________________________
80 AliCheb3D::AliCheb3D(const char* inpFile) :
90 // read coefs from text file
92 fBMin[i] = fBMax[i] = fBScale[i] = fBOffset[i] = 0;
100 //__________________________________________________________________________________________
101 AliCheb3D::AliCheb3D(FILE* stream) :
111 // read coefs from stream
113 fBMin[i] = fBMax[i] = fBScale[i] = fBOffset[i] = 0;
121 //__________________________________________________________________________________________
122 #ifdef _INC_CREATION_ALICHEB3D_
123 AliCheb3D::AliCheb3D(const char* funName, int DimOut, const Float_t *bmin, const Float_t *bmax, Int_t *npoints, Float_t prec, const Float_t* precD) :
124 TNamed(funName,funName),
126 fPrec(TMath::Max(fgkMinPrec,prec)),
134 // Construct the parameterization for the function
135 // funName : name of the file containing the function: void funName(Float_t * inp,Float_t * out)
136 // DimOut : dimension of the vector computed by the user function
137 // bmin : array of 3 elements with the lower boundaries of the region where the function is defined
138 // bmax : array of 3 elements with the upper boundaries of the region where the function is defined
139 // npoints : array of 3 elements with the number of points to compute in each of 3 dimension
140 // prec : max allowed absolute difference between the user function and computed parameterization on the requested grid
141 // precD : optional array with precisions per output dimension (if >fgkMinPrec will override common prec)
142 if (DimOut<1) {Error("AliCheb3D","Requested output dimension is %d\nStop\n",fDimOut); exit(1);}
144 fBMin[i] = fBMax[i] = fBScale[i] = fBOffset[i] = 0;
149 SetDimOut(DimOut,precD);
150 PrepareBoundaries(bmin,bmax);
152 SetUsrFunction(funName);
158 //__________________________________________________________________________________________
159 #ifdef _INC_CREATION_ALICHEB3D_
160 AliCheb3D::AliCheb3D(void (*ptr)(float*,float*), int DimOut, Float_t *bmin,Float_t *bmax, Int_t *npoints, Float_t prec, const Float_t* precD) :
161 TNamed("Cheb3D","Cheb3D"),
163 fPrec(TMath::Max(fgkMinPrec,prec)),
171 // Construct the parameterization for the function
172 // ptr : pointer on the function: void fun(Float_t * inp,Float_t * out)
173 // DimOut : dimension of the vector computed by the user function
174 // bmin : array of 3 elements with the lower boundaries of the region where the function is defined
175 // bmax : array of 3 elements with the upper boundaries of the region where the function is defined
176 // npoints : array of 3 elements with the number of points to compute in each of 3 dimension
177 // prec : max allowed absolute difference between the user function and computed parameterization on the requested grid
178 // precD : optional array with precisions per output dimension (if >fgkMinPrec will override common prec)
180 if (DimOut<1) {Error("AliCheb3D","Requested output dimension is %d\nStop\n",fDimOut); exit(1);}
181 if (DimOut<1) {Error("AliCheb3D","Requested output dimension is %d\nStop\n",fDimOut); exit(1);}
183 fBMin[i] = fBMax[i] = fBScale[i] = fBOffset[i] = 0;
188 SetDimOut(DimOut,precD);
189 PrepareBoundaries(bmin,bmax);
197 //__________________________________________________________________________________________
198 #ifdef _INC_CREATION_ALICHEB3D_
199 AliCheb3D::AliCheb3D(void (*ptr)(float*,float*), int DimOut, Float_t *bmin,Float_t *bmax, Int_t *npX,Int_t *npY,Int_t *npZ, Float_t prec, const Float_t* precD) :
200 TNamed("Cheb3D","Cheb3D"),
202 fPrec(TMath::Max(fgkMinPrec,prec)),
210 // Construct very economic parameterization for the function
211 // ptr : pointer on the function: void fun(Float_t * inp,Float_t * out)
212 // DimOut : dimension of the vector computed by the user function
213 // bmin : array of 3 elements with the lower boundaries of the region where the function is defined
214 // bmax : array of 3 elements with the upper boundaries of the region where the function is defined
215 // npX : array of 3 elements with the number of points to compute in each dimension for 1st component
216 // npY : array of 3 elements with the number of points to compute in each dimension for 2nd component
217 // npZ : array of 3 elements with the number of points to compute in each dimension for 3d component
218 // prec : max allowed absolute difference between the user function and computed parameterization on the requested grid
219 // precD : optional array with precisions per output dimension (if >fgkMinPrec will override common prec)
221 if (DimOut<1) {Error("AliCheb3D","Requested output dimension is %d\nStop\n",fDimOut); exit(1);}
222 if (DimOut<1) {Error("AliCheb3D","Requested output dimension is %d\nStop\n",fDimOut); exit(1);}
224 fBMin[i] = fBMax[i] = fBScale[i] = fBOffset[i] = 0;
229 SetDimOut(DimOut,precD);
230 PrepareBoundaries(bmin,bmax);
244 //__________________________________________________________________________________________
245 #ifdef _INC_CREATION_ALICHEB3D_
246 AliCheb3D::AliCheb3D(void (*ptr)(float*,float*), int DimOut, Float_t *bmin,Float_t *bmax, Float_t prec, Bool_t run, const Float_t* precD) :
247 TNamed("Cheb3D","Cheb3D"),
249 fPrec(TMath::Max(fgkMinPrec,prec)),
257 // Construct very economic parameterization for the function with automatic calculation of the root's grid
258 // ptr : pointer on the function: void fun(Float_t * inp,Float_t * out)
259 // DimOut : dimension of the vector computed by the user function
260 // bmin : array of 3 elements with the lower boundaries of the region where the function is defined
261 // bmax : array of 3 elements with the upper boundaries of the region where the function is defined
262 // prec : max allowed absolute difference between the user function and computed parameterization on the requested grid
263 // precD : optional array with precisions per output dimension (if >fgkMinPrec will override common prec)
265 if (DimOut!=3) {Error("AliCheb3D","This constructor works only for 3D fits, %dD fit was requested\n",fDimOut); exit(1);}
266 if (DimOut<1) {Error("AliCheb3D","Requested output dimension is %d\nStop\n",fDimOut); exit(1);}
268 fBMin[i] = fBMax[i] = fBScale[i] = fBOffset[i] = 0;
273 SetDimOut(DimOut,precD);
274 PrepareBoundaries(bmin,bmax);
279 EstimateNPoints(prec,gridNC);
280 DefineGrid(gridNC[0]);
282 DefineGrid(gridNC[1]);
284 DefineGrid(gridNC[2]);
292 //__________________________________________________________________________________________
293 AliCheb3D& AliCheb3D::operator=(const AliCheb3D& rhs)
295 // assignment operator
299 fDimOut = rhs.fDimOut;
301 fMaxCoefs = rhs.fMaxCoefs;
302 fUsrFunName = rhs.fUsrFunName;
305 fBMin[i] = rhs.fBMin[i];
306 fBMax[i] = rhs.fBMax[i];
307 fBScale[i] = rhs.fBScale[i];
308 fBOffset[i] = rhs.fBOffset[i];
309 fNPoints[i] = rhs.fNPoints[i];
311 for (int i=0;i<fDimOut;i++) {
312 AliCheb3DCalc* cbc = rhs.GetChebCalc(i);
313 if (cbc) fChebCalc.AddAtAndExpand(new AliCheb3DCalc(*cbc),i);
320 //__________________________________________________________________________________________
321 void AliCheb3D::Clear(const Option_t*)
323 // clear all dynamic structures
325 if (fResTmp) { delete[] fResTmp; fResTmp = 0; }
326 if (fGrid) { delete[] fGrid; fGrid = 0; }
327 if (fUsrMacro) { delete fUsrMacro; fUsrMacro = 0;}
328 fChebCalc.SetOwner(kTRUE);
333 //__________________________________________________________________________________________
334 void AliCheb3D::Print(const Option_t* opt) const
338 printf("%s: Chebyshev parameterization for 3D->%dD function. Precision: %e\n",GetName(),fDimOut,fPrec);
339 printf("Region of validity: [%+.5e:%+.5e] [%+.5e:%+.5e] [%+.5e:%+.5e]\n",fBMin[0],fBMax[0],fBMin[1],fBMax[1],fBMin[2],fBMax[2]);
340 TString opts = opt; opts.ToLower();
341 if (opts.Contains("l")) for (int i=0;i<fDimOut;i++) {printf("Output dimension %d:\n",i+1); GetChebCalc(i)->Print();}
345 //__________________________________________________________________________________________
346 void AliCheb3D::PrepareBoundaries(const Float_t *bmin, const Float_t *bmax)
348 // Set and check boundaries defined by user, prepare coefficients for their conversion to [-1:1] interval
353 fBScale[i] = bmax[i]-bmin[i];
355 AliFatal(Form("Boundaries for %d-th dimension are not increasing: %+.4e %+.4e\nStop\n",i,fBMin[i],fBMax[i]));
357 fBOffset[i] = bmin[i] + fBScale[i]/2.0;
358 fBScale[i] = 2./fBScale[i];
364 //__________________________________________________________________________________________
365 #ifdef _INC_CREATION_ALICHEB3D_
367 // Pointer on user function (faster altrnative to TMethodCall)
368 void (*gUsrFunAliCheb3D) (float* ,float* );
370 void AliCheb3D::EvalUsrFunction()
372 // call user supplied function
373 if (gUsrFunAliCheb3D) gUsrFunAliCheb3D(fArgsTmp,fResTmp);
374 else fUsrMacro->Execute();
377 void AliCheb3D::SetUsrFunction(const char* name)
379 // load user macro with function definition and compile it
380 gUsrFunAliCheb3D = 0;
382 gSystem->ExpandPathName(fUsrFunName);
383 if (fUsrMacro) delete fUsrMacro;
384 TString tmpst = fUsrFunName;
385 tmpst += "+"; // prepare filename to compile
386 if (gROOT->LoadMacro(tmpst.Data())) {Error("SetUsrFunction","Failed to load user function from %s\nStop\n",name); exit(1);}
387 fUsrMacro = new TMethodCall();
388 tmpst = tmpst.Data() + tmpst.Last('/')+1; //Strip away any path preceding the macro file name
389 int dot = tmpst.Last('.');
390 if (dot>0) tmpst.Resize(dot);
391 fUsrMacro->InitWithPrototype(tmpst.Data(),"Float_t *,Float_t *");
393 args[0] = (long)fArgsTmp;
394 args[1] = (long)fResTmp;
395 fUsrMacro->SetParamPtrs(args);
400 //__________________________________________________________________________________________
401 #ifdef _INC_CREATION_ALICHEB3D_
402 void AliCheb3D::SetUsrFunction(void (*ptr)(float*,float*))
404 // assign user training function
406 if (fUsrMacro) delete fUsrMacro;
409 gUsrFunAliCheb3D = ptr;
413 //__________________________________________________________________________________________
414 #ifdef _INC_CREATION_ALICHEB3D_
415 void AliCheb3D::EvalUsrFunction(const Float_t *x, Float_t *res)
417 // evaluate user function value
419 for (int i=3;i--;) fArgsTmp[i] = x[i];
420 if (gUsrFunAliCheb3D) gUsrFunAliCheb3D(fArgsTmp,fResTmp);
421 else fUsrMacro->Execute();
422 for (int i=fDimOut;i--;) res[i] = fResTmp[i];
426 //__________________________________________________________________________________________
427 #ifdef _INC_CREATION_ALICHEB3D_
428 Int_t AliCheb3D::CalcChebCoefs(const Float_t *funval,int np, Float_t *outCoefs, Float_t prec)
430 // Calculate Chebyshev coeffs using precomputed function values at np roots.
431 // If prec>0, estimate the highest coeff number providing the needed precision
433 double sm; // do summations in double to minimize the roundoff error
434 for (int ic=0;ic<np;ic++) { // compute coeffs
436 for (int ir=0;ir<np;ir++) {
437 float rt = TMath::Cos( ic*(ir+0.5)*TMath::Pi()/np);
440 outCoefs[ic] = Float_t( sm * ((ic==0) ? 1./np : 2./np) );
443 if (prec<=0) return np;
447 for (cfMax=np;cfMax--;) {
448 sm += TMath::Abs(outCoefs[cfMax]);
451 if (++cfMax==0) cfMax=1;
457 //__________________________________________________________________________________________
458 #ifdef _INC_CREATION_ALICHEB3D_
459 void AliCheb3D::DefineGrid(Int_t* npoints)
461 // prepare the grid of Chebyshev roots in each dimension
462 const int kMinPoints = 1;
465 for (int id=3;id--;) {
466 fNPoints[id] = npoints[id];
467 if (fNPoints[id]<kMinPoints) {
468 Error("DefineGrid","at %d-th dimension %d point is requested, at least %d is needed\nStop\n",id,fNPoints[id],kMinPoints);
471 ntot += fNPoints[id];
472 fMaxCoefs *= fNPoints[id];
474 printf("Computing Chebyshev nodes on [%2d/%2d/%2d] grid\n",npoints[0],npoints[1],npoints[2]);
475 if (fGrid) delete[] fGrid;
476 fGrid = new Float_t [ntot];
479 for (int id=3;id--;) {
480 int np = fNPoints[id];
481 fGridOffs[id] = curp;
482 for (int ip=0;ip<np;ip++) {
483 Float_t x = TMath::Cos( TMath::Pi()*(ip+0.5)/np );
484 fGrid[curp++] = MapToExternal(x,id);
491 //__________________________________________________________________________________________
492 #ifdef _INC_CREATION_ALICHEB3D_
493 Int_t AliCheb3D::ChebFit()
495 // prepare parameterization for all output dimensions
497 for (int i=fDimOut;i--;) ir+=ChebFit(i);
502 //__________________________________________________________________________________________
503 #ifdef _INC_CREATION_ALICHEB3D_
504 Int_t AliCheb3D::ChebFit(int dmOut)
506 // prepare paramaterization of 3D function for dmOut-th dimension
508 for (int i=0;i<3;i++) if (maxDim<fNPoints[i]) maxDim = fNPoints[i];
509 Float_t *fvals = new Float_t [ fNPoints[0] ];
510 Float_t *tmpCoef3D = new Float_t [ fNPoints[0]*fNPoints[1]*fNPoints[2] ];
511 Float_t *tmpCoef2D = new Float_t [ fNPoints[0]*fNPoints[1] ];
512 Float_t *tmpCoef1D = new Float_t [ maxDim ];
514 // 1D Cheb.fit for 0-th dimension at current steps of remaining dimensions
517 printf("Dim%d : 00.00%% Done",dmOut);fflush(stdout);
518 AliCheb3DCalc* cheb = GetChebCalc(dmOut);
520 Float_t prec = cheb->GetPrecision();
521 if (prec<fgkMinPrec) prec = fPrec; // no specific precision for this dim.
523 Float_t rTiny = 0.1*prec/Float_t(maxDim); // neglect coefficient below this threshold
525 float ncals2count = fNPoints[2]*fNPoints[1]*fNPoints[0];
528 float fracStep = 0.001;
530 for (int id2=fNPoints[2];id2--;) {
531 fArgsTmp[2] = fGrid[ fGridOffs[2]+id2 ];
533 for (int id1=fNPoints[1];id1--;) {
534 fArgsTmp[1] = fGrid[ fGridOffs[1]+id1 ];
536 for (int id0=fNPoints[0];id0--;) {
537 fArgsTmp[0] = fGrid[ fGridOffs[0]+id0 ];
538 EvalUsrFunction(); // compute function values at Chebyshev roots of 0-th dimension
539 fvals[id0] = fResTmp[dmOut];
540 float fr = (++ncals)/ncals2count;
541 if (fr-frac>=fracStep) {
543 printf("\b\b\b\b\b\b\b\b\b\b\b");
544 printf("%05.2f%% Done",fr*100);
549 int nc = CalcChebCoefs(fvals,fNPoints[0], tmpCoef1D, prec);
550 for (int id0=fNPoints[0];id0--;) tmpCoef2D[id1 + id0*fNPoints[1]] = tmpCoef1D[id0];
551 if (ncmax<nc) ncmax = nc; // max coefs to be kept in dim0 to guarantee needed precision
554 // once each 1d slice of given 2d slice is parametrized, parametrize the Cheb.coeffs
555 for (int id0=fNPoints[0];id0--;) {
556 CalcChebCoefs( tmpCoef2D+id0*fNPoints[1], fNPoints[1], tmpCoef1D, -1);
557 for (int id1=fNPoints[1];id1--;) tmpCoef3D[id2 + fNPoints[2]*(id1+id0*fNPoints[1])] = tmpCoef1D[id1];
561 // now fit the last dimensions Cheb.coefs
562 for (int id0=fNPoints[0];id0--;) {
563 for (int id1=fNPoints[1];id1--;) {
564 CalcChebCoefs( tmpCoef3D+ fNPoints[2]*(id1+id0*fNPoints[1]), fNPoints[2], tmpCoef1D, -1);
565 for (int id2=fNPoints[2];id2--;) tmpCoef3D[id2+ fNPoints[2]*(id1+id0*fNPoints[1])] = tmpCoef1D[id2]; // store on place
569 // now find 2D surface which separates significant coefficients of 3D matrix from nonsignificant ones (up to prec)
570 UShort_t *tmpCoefSurf = new UShort_t[ fNPoints[0]*fNPoints[1] ];
571 for (int id0=fNPoints[0];id0--;) for (int id1=fNPoints[1];id1--;) tmpCoefSurf[id1+id0*fNPoints[1]]=0;
573 for (int id0=fNPoints[0];id0--;) {
574 for (int id1=fNPoints[1];id1--;) {
575 for (int id2=fNPoints[2];id2--;) {
576 int id = id2 + fNPoints[2]*(id1+id0*fNPoints[1]);
577 Float_t cfa = TMath::Abs(tmpCoef3D[id]);
578 if (cfa < rTiny) {tmpCoef3D[id] = 0; continue;} // neglect coefs below the threshold
580 if (resid<prec) continue; // this coeff is negligible
581 // otherwise go back 1 step
583 tmpCoefSurf[id1+id0*fNPoints[1]] = id2+1; // how many coefs to keep
589 printf("\n\nCoeffs\n");
591 for (int id0=0;id0<fNPoints[0];id0++) {
592 for (int id1=0;id1<fNPoints[1];id1++) {
593 for (int id2=0;id2<fNPoints[2];id2++) {
594 printf("%2d%2d%2d %+.4e |",id0,id1,id2,tmpCoef3D[cnt++]);
601 // see if there are rows to reject, find max.significant column at each row
602 int nRows = fNPoints[0];
603 UShort_t *tmpCols = new UShort_t[nRows];
604 for (int id0=fNPoints[0];id0--;) {
605 int id1 = fNPoints[1];
606 while (id1>0 && tmpCoefSurf[(id1-1)+id0*fNPoints[1]]==0) id1--;
609 // find max significant row
610 for (int id0=nRows;id0--;) {if (tmpCols[id0]>0) break; nRows--;}
611 // find max significant column and fill the permanent storage for the max sigificant column of each row
612 cheb->InitRows(nRows); // create needed arrays;
613 UShort_t *nColsAtRow = cheb->GetNColsAtRow();
614 UShort_t *colAtRowBg = cheb->GetColAtRowBg();
616 int nElemBound2D = 0;
617 for (int id0=0;id0<nRows;id0++) {
618 nColsAtRow[id0] = tmpCols[id0]; // number of columns to store for this row
619 colAtRowBg[id0] = nElemBound2D; // begining of this row in 2D boundary surface
620 nElemBound2D += tmpCols[id0];
621 if (nCols<nColsAtRow[id0]) nCols = nColsAtRow[id0];
623 cheb->InitCols(nCols);
626 // create the 2D matrix defining the boundary of significance for 3D coeffs.matrix
627 // and count the number of siginifacnt coefficients
629 cheb->InitElemBound2D(nElemBound2D);
630 UShort_t *coefBound2D0 = cheb->GetCoefBound2D0();
631 UShort_t *coefBound2D1 = cheb->GetCoefBound2D1();
632 fMaxCoefs = 0; // redefine number of coeffs
633 for (int id0=0;id0<nRows;id0++) {
634 int nCLoc = nColsAtRow[id0];
635 int col0 = colAtRowBg[id0];
636 for (int id1=0;id1<nCLoc;id1++) {
637 coefBound2D0[col0 + id1] = tmpCoefSurf[id1+id0*fNPoints[1]]; // number of coefs to store for 3-d dimension
638 coefBound2D1[col0 + id1] = fMaxCoefs;
639 fMaxCoefs += coefBound2D0[col0 + id1];
643 // create final compressed 3D matrix for significant coeffs
644 cheb->InitCoefs(fMaxCoefs);
645 Float_t *coefs = cheb->GetCoefs();
647 for (int id0=0;id0<nRows;id0++) {
648 int ncLoc = nColsAtRow[id0];
649 int col0 = colAtRowBg[id0];
650 for (int id1=0;id1<ncLoc;id1++) {
651 int ncf2 = coefBound2D0[col0 + id1];
652 for (int id2=0;id2<ncf2;id2++) {
653 coefs[count++] = tmpCoef3D[id2 + fNPoints[2]*(id1+id0*fNPoints[1])];
658 printf("\n\nNewSurf\n");
659 for (int id0=0;id0<fNPoints[0];id0++) {
660 for (int id1=0;id1<fNPoints[1];id1++) {
661 printf("(%2d %2d) %2d |",id0,id1,tmpCoefSurf[id1+id0*fNPoints[1]]);
667 delete[] tmpCoefSurf;
673 printf("\b\b\b\b\b\b\b\b\b\b\b\b");
674 printf("100.00%% Done\n");
679 //_______________________________________________
680 #ifdef _INC_CREATION_ALICHEB3D_
681 void AliCheb3D::SaveData(const char* outfile,Bool_t append) const
683 // writes coefficients data to output text file, optionallt appending on the end of existing file
684 TString strf = outfile;
685 gSystem->ExpandPathName(strf);
686 FILE* stream = fopen(strf,append ? "a":"w");
693 //_______________________________________________
694 #ifdef _INC_CREATION_ALICHEB3D_
695 void AliCheb3D::SaveData(FILE* stream) const
697 // writes coefficients data to existing output stream
699 fprintf(stream,"\n# These are automatically generated data for the Chebyshev interpolation of 3D->%dD function\n",fDimOut);
700 fprintf(stream,"#\nSTART %s\n",GetName());
701 fprintf(stream,"# Dimensionality of the output\n%d\n",fDimOut);
702 fprintf(stream,"# Interpolation abs. precision\n%+.8e\n",fPrec);
704 fprintf(stream,"# Lower boundaries of interpolation region\n");
705 for (int i=0;i<3;i++) fprintf(stream,"%+.8e\n",fBMin[i]);
706 fprintf(stream,"# Upper boundaries of interpolation region\n");
707 for (int i=0;i<3;i++) fprintf(stream,"%+.8e\n",fBMax[i]);
708 fprintf(stream,"# Parameterization for each output dimension follows:\n");
710 for (int i=0;i<fDimOut;i++) GetChebCalc(i)->SaveData(stream);
711 fprintf(stream,"#\nEND %s\n#\n",GetName());
716 //__________________________________________________________________________________________
717 #ifdef _INC_CREATION_ALICHEB3D_
718 void AliCheb3D::InvertSign()
720 // invert the sign of all parameterizations
721 for (int i=fDimOut;i--;) {
722 AliCheb3DCalc* par = GetChebCalc(i);
723 int ncf = par->GetNCoefs();
724 float *coefs = par->GetCoefs();
725 for (int j=ncf;j--;) coefs[j] = -coefs[j];
731 //_______________________________________________
732 void AliCheb3D::LoadData(const char* inpFile)
734 // load coefficients data from txt file
736 TString strf = inpFile;
737 gSystem->ExpandPathName(strf);
738 FILE* stream = fopen(strf.Data(),"r");
744 //_______________________________________________
745 void AliCheb3D::LoadData(FILE* stream)
747 // load coefficients data from stream
749 if (!stream) {AliFatal("No stream provided.\nStop");}
752 AliCheb3DCalc::ReadLine(buffs,stream);
753 if (!buffs.BeginsWith("START")) {AliFatal(Form("Expected: \"START <fit_name>\", found \"%s\"\nStop\n",buffs.Data()));}
754 SetName(buffs.Data()+buffs.First(' ')+1);
756 AliCheb3DCalc::ReadLine(buffs,stream); // N output dimensions
757 fDimOut = buffs.Atoi();
758 if (fDimOut<1) {AliFatal(Form("Expected: '<number_of_output_dimensions>', found \"%s\"\nStop\n",buffs.Data()));}
762 AliCheb3DCalc::ReadLine(buffs,stream); // Interpolation abs. precision
763 fPrec = buffs.Atof();
764 if (fPrec<=0) {AliFatal(Form("Expected: '<abs.precision>', found \"%s\"\nStop\n",buffs.Data()));}
766 for (int i=0;i<3;i++) { // Lower boundaries of interpolation region
767 AliCheb3DCalc::ReadLine(buffs,stream);
768 fBMin[i] = buffs.Atof();
770 for (int i=0;i<3;i++) { // Upper boundaries of interpolation region
771 AliCheb3DCalc::ReadLine(buffs,stream);
772 fBMax[i] = buffs.Atof();
774 PrepareBoundaries(fBMin,fBMax);
776 // data for each output dimension
777 for (int i=0;i<fDimOut;i++) GetChebCalc(i)->LoadData(stream);
779 // check end_of_data record
780 AliCheb3DCalc::ReadLine(buffs,stream);
781 if (!buffs.BeginsWith("END") || !buffs.Contains(GetName())) {
782 AliFatal(Form("Expected \"END %s\", found \"%s\".\nStop\n",GetName(),buffs.Data()));
787 //_______________________________________________
788 void AliCheb3D::SetDimOut(const int d, const float* prec)
790 // init output dimensions
792 if (fResTmp) delete fResTmp;
793 fResTmp = new Float_t[fDimOut];
795 for (int i=0;i<d;i++) {
796 AliCheb3DCalc* clc = new AliCheb3DCalc();
797 clc->SetPrecision(prec && prec[i]>fgkMinPrec ? prec[i] : fPrec);
798 fChebCalc.AddAtAndExpand(clc,i);
802 //_______________________________________________
803 void AliCheb3D::ShiftBound(int id,float dif)
805 // modify the bounds of the grid
807 if (id<0||id>2) {printf("Maximum 3 dimensions are supported\n"); return;}
813 //_______________________________________________
814 #ifdef _INC_CREATION_ALICHEB3D_
815 TH1* AliCheb3D::TestRMS(int idim,int npoints,TH1* histo)
817 // fills the difference between the original function and parameterization (for idim-th component of the output)
818 // to supplied histogram. Calculations are done in npoints random points.
819 // If the hostgram was not supplied, it will be created. It is up to the user to delete it!
821 printf("No user function is set\n");
824 float prc = GetChebCalc(idim)->GetPrecision();
825 if (prc<fgkMinPrec) prc = fPrec; // no dimension specific precision
826 if (!histo) histo = new TH1D(GetName(),"Control: Function - Parametrization",100,-2*prc,2*prc);
827 for (int ip=npoints;ip--;) {
828 gRandom->RndmArray(3,(Float_t *)fArgsTmp);
829 for (int i=3;i--;) fArgsTmp[i] = fBMin[i] + fArgsTmp[i]*(fBMax[i]-fBMin[i]);
831 Float_t valFun = fResTmp[idim];
832 Eval(fArgsTmp,fResTmp);
833 Float_t valPar = fResTmp[idim];
834 histo->Fill(valFun - valPar);
841 //_______________________________________________
842 #ifdef _INC_CREATION_ALICHEB3D_
844 void AliCheb3D::EstimateNPoints(float prec, int gridBC[3][3],Int_t npd1,Int_t npd2,Int_t npd3)
846 // Estimate number of points to generate a training data
849 const float kScl[9] = {0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9};
851 const float sclDim[2] = {0.001,0.999};
852 const int compDim[3][2] = { {1,2}, {2,0}, {0,1} };
854 Int_t npdTst[3] = {npd1,npd2,npd3};
857 for (int i=3;i--;)for (int j=3;j--;) gridBC[i][j] = -1;
859 for (int idim=0;idim<3;idim++) {
860 float dimMN = fBMin[idim] + sclDim[0]*(fBMax[idim]-fBMin[idim]);
861 float dimMX = fBMin[idim] + sclDim[1]*(fBMax[idim]-fBMin[idim]);
863 int id1 = compDim[idim][0]; // 1st fixed dim
864 int id2 = compDim[idim][1]; // 2nd fixed dim
865 for (int i1=0;i1<kScp;i1++) {
866 xyz[ id1 ] = fBMin[id1] + kScl[i1]*( fBMax[id1]-fBMin[id1] );
867 for (int i2=0;i2<kScp;i2++) {
868 xyz[ id2 ] = fBMin[id2] + kScl[i2]*( fBMax[id2]-fBMin[id2] );
869 int* npt = GetNCNeeded(xyz,idim, dimMN,dimMX, prec, npdTst[idim]); // npoints for Bx,By,Bz
870 for (int ib=0;ib<3;ib++) if (npt[ib]>gridBC[ib][idim]) gridBC[ib][idim] = npt[ib];
877 void AliCheb3D::EstimateNPoints(float prec, int gridBC[3][3])
879 // Estimate number of points to generate a training data
881 const float sclA[9] = {0.1, 0.5, 0.9, 0.1, 0.5, 0.9, 0.1, 0.5, 0.9} ;
882 const float sclB[9] = {0.1, 0.1, 0.1, 0.5, 0.5, 0.5, 0.9, 0.9, 0.9} ;
883 const float sclDim[2] = {0.01,0.99};
884 const int compDim[3][2] = { {1,2}, {2,0}, {0,1} };
887 for (int i=3;i--;)for (int j=3;j--;) gridBC[i][j] = -1;
889 for (int idim=0;idim<3;idim++) {
890 float dimMN = fBMin[idim] + sclDim[0]*(fBMax[idim]-fBMin[idim]);
891 float dimMX = fBMin[idim] + sclDim[1]*(fBMax[idim]-fBMin[idim]);
893 for (int it=0;it<9;it++) { // test in 9 points
894 int id1 = compDim[idim][0]; // 1st fixed dim
895 int id2 = compDim[idim][1]; // 2nd fixed dim
896 xyz[ id1 ] = fBMin[id1] + sclA[it]*( fBMax[id1]-fBMin[id1] );
897 xyz[ id2 ] = fBMin[id2] + sclB[it]*( fBMax[id2]-fBMin[id2] );
899 int* npt = GetNCNeeded(xyz,idim, dimMN,dimMX, prec); // npoints for Bx,By,Bz
900 for (int ib=0;ib<3;ib++) if (npt[ib]>gridBC[ib][idim]) gridBC[ib][idim] = npt[ib];//+2;
907 int* AliCheb3D::GetNCNeeded(float xyz[3],int DimVar, float mn,float mx, float prec)
909 // estimate needed number of chebyshev coefs for given function description in DimVar dimension
910 // The values for two other dimensions must be set beforehand
914 const int kMaxPoint = 400;
915 float* gridVal = new float[3*kMaxPoint];
916 float* coefs = new float[3*kMaxPoint];
919 float offs = mn + scale/2.0;
925 for (int i=0;i<3;i++) retNC[i] = -1;
926 for (int i=0;i<3;i++) fArgsTmp[i] = xyz[i];
928 for (curNP=3; curNP<kMaxPoint; curNP+=3) {
931 for (int i=0;i<curNP;i++) { // get function values on Cheb. nodes
932 float x = TMath::Cos( TMath::Pi()*(i+0.5)/curNP );
933 fArgsTmp[DimVar] = x/scale+offs; // map to requested interval
935 for (int ib=3;ib--;) gridVal[ib*kMaxPoint + i] = fResTmp[ib];
938 for (int ib=0;ib<3;ib++) {
939 curNC[ib] = AliCheb3D::CalcChebCoefs(&gridVal[ib*kMaxPoint], curNP, &coefs[ib*kMaxPoint],prec);
940 if (maxNC < curNC[ib]) maxNC = curNC[ib];
941 if (retNC[ib] < curNC[ib]) retNC[ib] = curNC[ib];
943 if ( (curNP-maxNC)>3 && (maxNC-maxNCPrev)<1 ) break;
955 int* AliCheb3D::GetNCNeeded(float xyz[3],int DimVar, float mn,float mx, float prec, Int_t npCheck)
957 // estimate needed number of chebyshev coefs for given function description in DimVar dimension
958 // The values for two other dimensions must be set beforehand
961 static int npChLast = 0;
962 static float *gridVal=0,*coefs=0;
963 if (npCheck<3) npCheck = 3;
964 if (npChLast<npCheck) {
965 if (gridVal) delete[] gridVal;
966 if (coefs) delete[] coefs;
967 gridVal = new float[3*npCheck];
968 coefs = new float[3*npCheck];
973 float offs = mn + scale/2.0;
976 for (int i=0;i<3;i++) fArgsTmp[i] = xyz[i];
977 for (int i=0;i<npCheck;i++) {
978 fArgsTmp[DimVar] = TMath::Cos( TMath::Pi()*(i+0.5)/npCheck)/scale+offs; // map to requested interval
980 for (int ib=3;ib--;) gridVal[ib*npCheck + i] = fResTmp[ib];
983 for (int ib=0;ib<3;ib++) retNC[ib] = AliCheb3D::CalcChebCoefs(&gridVal[ib*npCheck], npCheck, &coefs[ib*npCheck],prec);