ROOT   Reference Guide
TF2.h
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1// @(#)root/hist:$Id$
2// Author: Rene Brun 23/08/95
3
4/*************************************************************************
5 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
7 * *
8 * For the licensing terms see $ROOTSYS/LICENSE. * 9 * For the list of contributors see$ROOTSYS/README/CREDITS. *
10 *************************************************************************/
11// ---------------------------------- F2.h
12
13#ifndef ROOT_TF2
14#define ROOT_TF2
15
16
17
18//////////////////////////////////////////////////////////////////////////
19// //
20// TF2 //
21// //
22// The Parametric 2-D function //
23// //
24//////////////////////////////////////////////////////////////////////////
25
26#include "TF1.h"
27#include "TArrayD.h"
28
29class TF2 : public TF1 {
30
31protected:
32 Double_t fYmin; //Lower bound for the range in y
33 Double_t fYmax; //Upper bound for the range in y
34 Int_t fNpy; //Number of points along y used for the graphical representation
35 TArrayD fContour; //Array to display contour levels
36
37public:
38 TF2();
39 TF2(const char *name, const char *formula, Double_t xmin=0, Double_t xmax=1, Double_t ymin=0, Double_t ymax=1, Option_t * opt = nullptr);
40#ifndef __CINT__
41 TF2(const char *name, Double_t (*fcn)(Double_t *, Double_t *), Double_t xmin=0, Double_t xmax=1, Double_t ymin=0, Double_t ymax=1, Int_t npar=0,Int_t ndim = 2);
42 TF2(const char *name, Double_t (*fcn)(const Double_t *, const Double_t *), Double_t xmin=0, Double_t xmax=1, Double_t ymin=0, Double_t ymax=1, Int_t npar=0, Int_t ndim = 2);
43#endif
44
45 // constructor using a functor
46
47 TF2(const char *name, ROOT::Math::ParamFunctor f, Double_t xmin = 0, Double_t xmax = 1, Double_t ymin = 0, Double_t ymax = 1, Int_t npar = 0, Int_t ndim = 2);
48
49
50 // Template constructors from a pointer to any C++ class of type PtrObj with a specific member function of type
51 // MemFn.
52 template <class PtrObj, typename MemFn>
53 TF2(const char *name, const PtrObj& p, MemFn memFn, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Int_t npar, Int_t ndim = 2) :
54 TF1(name,p,memFn,xmin,xmax,npar,ndim),
55 fYmin(ymin), fYmax(ymax), fNpy(30), fContour(0)
56 {
57 fNpx = 30;
58 }
59 /// backward compatible ctor
60 template <class PtrObj, typename MemFn>
61 TF2(const char *name, const PtrObj& p, MemFn memFn, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Int_t npar, const char * , const char *) :
62 TF1(name,p,memFn,xmin,xmax,npar,2),
63 fYmin(ymin), fYmax(ymax), fNpy(30), fContour(0)
64 {
65 fNpx = 30;
66 }
67
68 // Template constructors from any C++ callable object, defining the operator() (double * , double *)
69 // and returning a double.
70 template <typename Func>
71 TF2(const char *name, Func f, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Int_t npar,Int_t ndim = 2) :
72 TF1(name,f,xmin,xmax,npar,ndim),
73 fYmin(ymin), fYmax(ymax), fNpy(30), fContour(0)
74 {
75 fNpx = 30;
76 }
77 /// backward compatible ctor
78 template <typename Func>
79 TF2(const char *name, Func f, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Int_t npar,const char *) :
80 TF1(name,f,xmin,xmax,npar,2),
81 fYmin(ymin), fYmax(ymax), fNpy(30), fContour(0)
82 {
83 fNpx = 30;
84 }
85
86
87 TF2(const TF2 &f2);
88 TF2 &operator=(const TF2& rhs);
89 virtual ~TF2();
90 virtual void Copy(TObject &f2) const;
91 virtual Int_t DistancetoPrimitive(Int_t px, Int_t py);
92 virtual void Draw(Option_t *option="");
93 virtual TF1 *DrawCopy(Option_t *option="") const;
94 virtual TObject *DrawDerivative(Option_t * ="al") {return 0;}
95 virtual TObject *DrawIntegral(Option_t * ="al") {return 0;}
96 //virtual void DrawF2(const char *formula, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Option_t *option="");
97 virtual void ExecuteEvent(Int_t event, Int_t px, Int_t py);
98 virtual Int_t GetContour(Double_t *levels=0);
99 virtual Double_t GetContourLevel(Int_t level) const;
100 Int_t GetNpy() const {return fNpy;}
101 virtual char *GetObjectInfo(Int_t px, Int_t py) const;
104 virtual void GetRandom2(Double_t &xrandom, Double_t &yrandom);
105 using TF1::GetRange;
106 virtual void GetRange(Double_t &xmin, Double_t &ymin, Double_t &xmax, Double_t &ymax) const;
107 virtual void GetRange(Double_t &xmin, Double_t &ymin, Double_t &zmin, Double_t &xmax, Double_t &ymax, Double_t &zmax) const;
108 virtual Double_t GetSave(const Double_t *x);
109 virtual Double_t GetMinimumXY(Double_t &x, Double_t &y) const;
110 virtual Double_t GetMaximumXY(Double_t &x, Double_t &y) const;
111 using TF1::GetMinimum;
112 using TF1::GetMaximum;
113 virtual Double_t GetMinimum(Double_t *x ) const;
114 virtual Double_t GetMaximum(Double_t *x ) const;
115 virtual Double_t GetYmin() const {return fYmin;}
116 virtual Double_t GetYmax() const {return fYmax;}
117 using TF1::Integral;
118 virtual Double_t Integral(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsrel=1.e-6);
119 virtual Bool_t IsInside(const Double_t *x) const;
120 virtual TH1 *CreateHistogram();
121 virtual void Paint(Option_t *option="");
123 virtual void SavePrimitive(std::ostream &out, Option_t *option = "");
124 virtual void SetNpy(Int_t npy=100); // *MENU*
125 virtual void SetContour(Int_t nlevels=20, const Double_t *levels=0);
126 virtual void SetContourLevel(Int_t level, Double_t value);
127 virtual void SetRange(Double_t xmin, Double_t xmax);
128 virtual void SetRange(Double_t xmin, Double_t ymin, Double_t xmax, Double_t ymax); // *MENU*
130
131 //Moments
132 virtual Double_t Moment2(Double_t nx, Double_t ax, Double_t bx, Double_t ny, Double_t ay, Double_t by, Double_t epsilon=0.000001);
133 virtual Double_t CentralMoment2(Double_t nx, Double_t ax, Double_t bx, Double_t ny, Double_t ay, Double_t by, Double_t epsilon=0.000001);
134
135 virtual Double_t Mean2X(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsilon=0.000001) {return Moment2(1,ax,bx,0,ay,by,epsilon);}
136 virtual Double_t Mean2Y(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsilon=0.000001) {return Moment2(0,ax,bx,1,ay,by,epsilon);}
137
138 virtual Double_t Variance2X(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsilon=0.000001) {return CentralMoment2(2,ax,bx,0,ay,by,epsilon);}
139 virtual Double_t Variance2Y(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsilon=0.000001) {return CentralMoment2(0,ax,bx,2,ay,by,epsilon);}
140
141 virtual Double_t Covariance2XY(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsilon=0.000001) {return CentralMoment2(1,ax,bx,1,ay,by,epsilon);}
142
143protected:
144
145 virtual Double_t FindMinMax(Double_t* x, bool findmax) const;
146
147 ClassDef(TF2,4) //The Parametric 2-D function
148};
149
151 { TF1::SetRange(xmin, xmax); }
153 { SetRange(xmin, ymin, xmax, ymax); }
154
155#endif
#define f(i)
Definition: RSha256.hxx:104
int Int_t
Definition: RtypesCore.h:41
bool Bool_t
Definition: RtypesCore.h:59
double Double_t
Definition: RtypesCore.h:55
const char Option_t
Definition: RtypesCore.h:62
#define ClassDef(name, id)
Definition: Rtypes.h:326
char name[80]
Definition: TGX11.cxx:109
float xmin
Definition: THbookFile.cxx:93
float ymin
Definition: THbookFile.cxx:93
float xmax
Definition: THbookFile.cxx:93
float ymax
Definition: THbookFile.cxx:93
Param Functor class for Multidimensional functions.
Definition: ParamFunctor.h:274
Array of doubles (64 bits per element).
Definition: TArrayD.h:27
1-Dim function class
Definition: TF1.h:211
virtual Double_t GetMinimum(Double_t xmin=0, Double_t xmax=0, Double_t epsilon=1.E-10, Int_t maxiter=100, Bool_t logx=false) const
Returns the minimum value of the function on the (xmin, xmax) interval.
Definition: TF1.cxx:1676
virtual void SetRange(Double_t xmin, Double_t xmax)
Initialize the upper and lower bounds to draw the function.
Definition: TF1.cxx:3518
virtual Double_t Integral(Double_t a, Double_t b, Double_t epsrel=1.e-12)
IntegralOneDim or analytical integral.
Definition: TF1.cxx:2502
virtual void GetRange(Double_t *xmin, Double_t *xmax) const
Return range of a generic N-D function.
Definition: TF1.cxx:2263
Int_t fNpx
Definition: TF1.h:245
virtual Double_t GetMaximum(Double_t xmin=0, Double_t xmax=0, Double_t epsilon=1.E-10, Int_t maxiter=100, Bool_t logx=false) const
Returns the maximum value of the function.
Definition: TF1.cxx:1594
A 2-Dim function with parameters.
Definition: TF2.h:29
virtual Double_t GetMaximumXY(Double_t &x, Double_t &y) const
Compute the X and Y values corresponding to the maximum value of the function.
Definition: TF2.cxx:422
virtual Double_t FindMinMax(Double_t *x, bool findmax) const
Return minimum/maximum value of the function.
Definition: TF2.cxx:345
virtual Double_t GetMinimum(Double_t *x) const
Return minimum/maximum value of the function.
Definition: TF2.cxx:447
virtual void Paint(Option_t *option="")
Paint this 2-D function with its current attributes.
Definition: TF2.cxx:722
virtual Double_t Mean2X(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsilon=0.000001)
Definition: TF2.h:135
virtual Bool_t IsInside(const Double_t *x) const
Return kTRUE is the point is inside the function range.
Definition: TF2.cxx:665
virtual Double_t Variance2X(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsilon=0.000001)
Definition: TF2.h:138
virtual void Save(Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Double_t zmin, Double_t zmax)
Save values of function in array fSave.
Definition: TF2.cxx:776
virtual void SetNpy(Int_t npy=100)
Set the number of points used to draw the function.
Definition: TF2.cxx:932
virtual Double_t Moment2(Double_t nx, Double_t ax, Double_t bx, Double_t ny, Double_t ay, Double_t by, Double_t epsilon=0.000001)
Return x^nx * y^ny moment of a 2d function in range [ax,bx],[ay,by].
Definition: TF2.cxx:1009
virtual Double_t Mean2Y(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsilon=0.000001)
Definition: TF2.h:136
virtual Double_t GetMinimumXY(Double_t &x, Double_t &y) const
Compute the X and Y values corresponding to the minimum value of the function.
Definition: TF2.cxx:407
Int_t fNpy
Definition: TF2.h:34
virtual Int_t GetContour(Double_t *levels=0)
Return contour values into array levels.
Definition: TF2.cxx:308
TArrayD fContour
Definition: TF2.h:35
virtual void SavePrimitive(std::ostream &out, Option_t *option="")
Save primitive as a C++ statement(s) on output stream out.
Definition: TF2.cxx:820
TF2(const char *name, const PtrObj &p, MemFn memFn, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Int_t npar, const char *, const char *)
backward compatible ctor
Definition: TF2.h:61
virtual Double_t GetYmax() const
Definition: TF2.h:116
virtual Double_t Covariance2XY(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsilon=0.000001)
Definition: TF2.h:141
virtual Double_t GetYmin() const
Definition: TF2.h:115
virtual void ExecuteEvent(Int_t event, Int_t px, Int_t py)
Execute action corresponding to one event.
Definition: TF2.cxx:298
Double_t fYmax
Definition: TF2.h:33
TF2(const char *name, Func f, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Int_t npar, Int_t ndim=2)
Definition: TF2.h:71
virtual TObject * DrawIntegral(Option_t *="al")
Draw integral of this function.
Definition: TF2.h:95
virtual Double_t GetSave(const Double_t *x)
Get value corresponding to X in array of fSave values.
Definition: TF2.cxx:604
TF2(const char *name, const PtrObj &p, MemFn memFn, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Int_t npar, Int_t ndim=2)
Definition: TF2.h:53
TF2 & operator=(const TF2 &rhs)
Operator =.
Definition: TF2.cxx:166
virtual Double_t Integral(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsrel=1.e-6)
Return Integral of a 2d function in range [ax,bx],[ay,by] with desired relative accuracy (default val...
Definition: TF2.cxx:644
Double_t GetRandom()
Return a random number following this function shape.
Definition: TF2.cxx:494
virtual TF1 * DrawCopy(Option_t *option="") const
Draw a copy of this function with its current attributes-*.
Definition: TF2.cxx:268
virtual TObject * DrawDerivative(Option_t *="al")
Draw derivative of this function.
Definition: TF2.h:94
virtual Double_t Variance2Y(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsilon=0.000001)
Definition: TF2.h:139
virtual char * GetObjectInfo(Int_t px, Int_t py) const
Redefines TObject::GetObjectInfo.
Definition: TF2.cxx:468
Double_t fYmin
Definition: TF2.h:32
Int_t GetNpy() const
Definition: TF2.h:100
virtual Double_t GetContourLevel(Int_t level) const
Return the number of contour levels.
Definition: TF2.cxx:320
virtual ~TF2()
F2 default destructor.
Definition: TF2.cxx:177
virtual Int_t DistancetoPrimitive(Int_t px, Int_t py)
Compute distance from point px,py to a function.
Definition: TF2.cxx:210
virtual void Copy(TObject &f2) const
Copy this F2 to a new F2.
Definition: TF2.cxx:192
virtual void SetRange(Double_t xmin, Double_t xmax)
Initialize the upper and lower bounds to draw the function.
Definition: TF2.h:150
virtual void GetRange(Double_t &xmin, Double_t &ymin, Double_t &xmax, Double_t &ymax) const
Return range of a 2-D function.
Definition: TF2.cxx:579
virtual void SetContour(Int_t nlevels=20, const Double_t *levels=0)
Set the number and values of contour levels.
Definition: TF2.cxx:897
virtual Double_t CentralMoment2(Double_t nx, Double_t ax, Double_t bx, Double_t ny, Double_t ay, Double_t by, Double_t epsilon=0.000001)
Return x^nx * y^ny central moment of a 2d function in range [ax,bx],[ay,by].
Definition: TF2.cxx:1025
virtual void Draw(Option_t *option="")
Draw this function with its current attributes.
Definition: TF2.cxx:241
virtual void SetContourLevel(Int_t level, Double_t value)
Set value for one contour level.
Definition: TF2.cxx:918
TF2()
TF2 default constructor.
Definition: TF2.cxx:64
virtual Double_t GetMaximum(Double_t *x) const
Return maximum value of the function See TF2::GetMinimum.
Definition: TF2.cxx:456
virtual void GetRandom2(Double_t &xrandom, Double_t &yrandom)
Return 2 random numbers following this function shape.
Definition: TF2.cxx:529
virtual TH1 * CreateHistogram()
Create a histogram from function.
Definition: TF2.cxx:677
TF2(const char *name, Func f, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Int_t npar, const char *)
backward compatible ctor
Definition: TF2.h:79
The TH1 histogram class.
Definition: TH1.h:56
Mother of all ROOT objects.
Definition: TObject.h:37
Double_t y[n]
Definition: legend1.C:17
Double_t x[n]
Definition: legend1.C:17
REAL epsilon
Definition: triangle.c:617