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99adacae | 1 | #ifndef ALICHEB3DCALC_H |
2 | #define ALICHEB3DCALC_H | |
3 | /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
4 | * See cxx source for full Copyright notice */ | |
40389866 | 5 | #include <TNamed.h> |
5406439e | 6 | class TSystem; |
99adacae | 7 | // |
8 | // Author: Ruben Shahoyan | |
9 | // ruben.shahoyan@cern.ch 09/09/2006 | |
10 | // See Comments in AliCheb3D.h | |
11 | // | |
40389866 | 12 | |
13 | ||
14 | // to decrease the compilable code size comment this define. This will exclude the routines | |
15 | // used for the calculation and saving of the coefficients. | |
1cf34ee8 | 16 | //#define _INC_CREATION_ALICHEB3D_ |
40389866 | 17 | |
18 | // when _BRING_TO_BOUNDARY_ is defined, the point outside of the fitted folume is assumed | |
19 | // to be on the surface | |
5de97576 | 20 | // #define _BRING_TO_BOUNDARY_ |
40389866 | 21 | // |
22 | ||
99adacae | 23 | |
24 | class AliCheb3DCalc: public TNamed | |
25 | { | |
26 | public: | |
27 | AliCheb3DCalc(); | |
40389866 | 28 | AliCheb3DCalc(const AliCheb3DCalc& src); |
29 | AliCheb3DCalc(FILE* stream); | |
30 | ~AliCheb3DCalc() {Clear();} | |
99adacae | 31 | // |
40389866 | 32 | AliCheb3DCalc& operator=(const AliCheb3DCalc& rhs); |
5406439e | 33 | void Print(const Option_t* opt="") const; |
99adacae | 34 | void LoadData(FILE* stream); |
5406439e | 35 | Float_t EvalDeriv(int dim, const Float_t *par) const; |
36 | Float_t EvalDeriv2(int dim1,int dim2, const Float_t *par) const; | |
99adacae | 37 | // |
38 | #ifdef _INC_CREATION_ALICHEB3D_ | |
5406439e | 39 | void SaveData(const char* outfile,Bool_t append=kFALSE) const; |
40 | void SaveData(FILE* stream=stdout) const; | |
99adacae | 41 | #endif |
42 | // | |
99adacae | 43 | void InitRows(int nr); |
44 | void InitCols(int nc); | |
99adacae | 45 | Int_t* GetNColsAtRow() const {return fNColsAtRow;} |
46 | Int_t* GetColAtRowBg() const {return fColAtRowBg;} | |
40389866 | 47 | void InitElemBound2D(int ne); |
99adacae | 48 | Int_t* GetCoefBound2D0() const {return fCoefBound2D0;} |
49 | Int_t* GetCoefBound2D1() const {return fCoefBound2D1;} | |
5406439e | 50 | void Clear(const Option_t* option = ""); |
1cf34ee8 | 51 | static Float_t ChebEval1D(Float_t x, const Float_t * array, int ncf); |
52 | static Float_t ChebEval1Deriv(Float_t x, const Float_t * array, int ncf); | |
53 | static Float_t ChebEval1Deriv2(Float_t x, const Float_t * array, int ncf); | |
40389866 | 54 | void InitCoefs(int nc); |
99adacae | 55 | Float_t * GetCoefs() const {return fCoefs;} |
56 | // | |
40389866 | 57 | static void ReadLine(TString& str,FILE* stream); |
58 | // | |
ff66b122 | 59 | template <class T> |
60 | T Eval(const T *par) const { | |
61 | // evaluate Chebyshev parameterization for 3D function. | |
62 | // VERY IMPORTANT: par must contain the function arguments ALREADY MAPPED to [-1:1] interval | |
63 | int ncfRC; | |
64 | for (int id0=fNRows;id0--;) { | |
65 | int nCLoc = fNColsAtRow[id0]; // number of significant coefs on this row | |
66 | int col0 = fColAtRowBg[id0]; // beginning of local column in the 2D boundary matrix | |
67 | for (int id1=nCLoc;id1--;) { | |
68 | int id = id1+col0; | |
69 | fTmpCf1[id1] = (ncfRC=fCoefBound2D0[id]) ? ChebEval1D(par[2],fCoefs + fCoefBound2D1[id], ncfRC) : 0.0; | |
70 | } | |
71 | fTmpCf0[id0] = nCLoc>0 ? ChebEval1D(par[1],fTmpCf1,nCLoc):0.0; | |
72 | } | |
73 | return ChebEval1D(par[0],fTmpCf0,fNRows); | |
74 | } | |
75 | // | |
99adacae | 76 | protected: |
77 | Int_t fNCoefs; // total number of coeeficients | |
78 | Int_t fNRows; // number of significant rows in the 3D coeffs matrix | |
79 | Int_t fNCols; // max number of significant cols in the 3D coeffs matrix | |
80 | Int_t fNElemBound2D; // number of elements (fNRows*fNCols) to store for the 2D boundary of significant coeffs | |
81 | Int_t* fNColsAtRow; //[fNRows] number of sighificant columns (2nd dim) at each row of 3D coefs matrix | |
82 | Int_t* fColAtRowBg; //[fNRows] beginnig of significant columns (2nd dim) for row in the 2D boundary matrix | |
83 | Int_t* fCoefBound2D0; //[fNElemBound2D] 2D matrix defining the boundary of significance for 3D coeffs.matrix (Ncoefs for col/row) | |
84 | Int_t* fCoefBound2D1; //[fNElemBound2D] 2D matrix defining the start beginnig of significant coeffs for col/row | |
85 | Float_t * fCoefs; //[fNCoefs] array of Chebyshev coefficients | |
86 | // | |
87 | Float_t * fTmpCf1; //[fNCols] temp. coeffs for 2d summation | |
88 | Float_t * fTmpCf0; //[fNRows] temp. coeffs for 1d summation | |
89 | // | |
40389866 | 90 | ClassDef(AliCheb3DCalc,1) // Class for interpolation of 3D->1 function by Chebyshev parametrization |
99adacae | 91 | }; |
92 | ||
40389866 | 93 | //__________________________________________________________________________________________ |
94 | inline Float_t AliCheb3DCalc::ChebEval1D(Float_t x, const Float_t * array, int ncf ) | |
99adacae | 95 | { |
96 | // evaluate 1D Chebyshev parameterization. x is the argument mapped to [-1:1] interval | |
40389866 | 97 | Float_t b0, b1, b2, x2 = x+x; |
99adacae | 98 | b0 = array[--ncf]; |
99 | b1 = b2 = 0; | |
100 | for (int i=ncf;i--;) { | |
101 | b2 = b1; | |
102 | b1 = b0; | |
103 | b0 = array[i] + x2*b1 -b2; | |
104 | } | |
105 | return b0 - x*b1; | |
40389866 | 106 | // |
99adacae | 107 | } |
108 | ||
109 | #endif |