class TF2: public TF1


 a 2-Dim function with parameters
 TF2 graphics function is via the TH1 drawing functions.

      Example of a function

   TF2 *f2 = new TF2("f2","sin(x)*sin(y)/(x*y)",0,5,0,5);
   f2->Draw();

/* */

      See TF1 class for the list of functions formats

Function Members (Methods)

public:
TF2()
TF2(const TF2& f2)
TF2(const char* name, const char* formula, Double_t xmin = 0, Double_t xmax = 1, Double_t ymin = 0, Double_t ymax = 1)
TF2(const char* name, void* fcn, Double_t xmin = 0, Double_t xmax = 1, Double_t ymin = 0, Double_t ymax = 1, Int_t npar = 0)
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)
TF2(const char* name, void* ptr, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Int_t npar, char* className)
TF2(const char* name, void* ptr, void*, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Int_t npar, const char* className, const char* methodName = 0)
virtual~TF2()
voidTObject::AbstractMethod(const char* method) const
static voidTF1::AbsValue(Bool_t reject = kTRUE)
virtual voidTFormula::Analyze(const char* schain, Int_t& err, Int_t offset = 0)
virtual Bool_tTFormula::AnalyzeFunction(TString& chaine, Int_t& err, Int_t offset = 0)
virtual voidTObject::AppendPad(Option_t* option = "")
virtual voidTF1::Browse(TBrowser* b)
static voidTF1::CalcGaussLegendreSamplingPoints(Int_t num, Double_t* x, Double_t* w, Double_t eps = 3.0e-11)
virtual Double_tTF1::CentralMoment(Double_t n, Double_t a, Double_t b, const Double_t* params = 0, Double_t epsilon = 0.000001)
virtual Double_tCentralMoment2(Double_t nx, Double_t ax, Double_t bx, Double_t ny, Double_t ay, Double_t by, Double_t epsilon = 0.000001)
static TClass*Class()
virtual const char*TObject::ClassName() const
virtual voidTFormula::Clear(Option_t* option = "")
virtual TObject*TNamed::Clone(const char* newname = "") const
virtual Int_tTNamed::Compare(const TObject* obj) const
virtual Int_tTFormula::Compile(const char* expression = "")
virtual voidCopy(TObject& f2) const
virtual Double_tCovariance2XY(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsilon = 0.000001)
virtual TH1*CreateHistogram()
virtual char*TFormula::DefinedString(Int_t code)
virtual Double_tTFormula::DefinedValue(Int_t code)
virtual Int_tTFormula::DefinedVariable(TString& variable, Int_t& action)
virtual voidTObject::Delete(Option_t* option = "")MENU
virtual Double_tTF1::Derivative(Double_t x, Double_t* params = 0, Double_t epsilon = 0.001) const
virtual Double_tTF1::Derivative2(Double_t x, Double_t* params = 0, Double_t epsilon = 0.001) const
virtual Double_tTF1::Derivative3(Double_t x, Double_t* params = 0, Double_t epsilon = 0.001) const
static Double_tTF1::DerivativeError()
Int_tTAttLine::DistancetoLine(Int_t px, Int_t py, Double_t xp1, Double_t yp1, Double_t xp2, Double_t yp2)
virtual Int_tDistancetoPrimitive(Int_t px, Int_t py)
virtual voidDraw(Option_t* option = "")
virtual voidTObject::DrawClass() constMENU
virtual TObject*TObject::DrawClone(Option_t* option = "") constMENU
virtual TF1*DrawCopy(Option_t* option = "") const
virtual voidDrawDerivative(Option_t* = "al")
virtual voidTF1::DrawF1(const char* formula, Double_t xmin, Double_t xmax, Option_t* option = "")
virtual voidDrawF2(const char* formula, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Option_t* option = "")
virtual voidDrawIntegral(Option_t* = "al")
virtual voidTObject::Dump() constMENU
virtual voidTObject::Error(const char* method, const char* msgfmt) const
virtual Double_tTF1::Eval(Double_t x, Double_t y = 0, Double_t z = 0, Double_t t = 0) const
virtual Double_tTF1::EvalPar(const Double_t* x, const Double_t* params = 0)
virtual Double_tTFormula::EvalParOld(const Double_t* x, const Double_t* params = 0)
virtual voidTObject::Execute(const char* method, const char* params, Int_t* error = 0)
virtual voidTObject::Execute(TMethod* method, TObjArray* params, Int_t* error = 0)
virtual voidExecuteEvent(Int_t event, Int_t px, Int_t py)
virtual voidTObject::Fatal(const char* method, const char* msgfmt) const
virtual voidTNamed::FillBuffer(char*& buffer)
virtual TObject*TObject::FindObject(const char* name) const
virtual TObject*TObject::FindObject(const TObject* obj) const
virtual voidTF1::FixParameter(Int_t ipar, Double_t value)
Double_tTF1::GetChisquare() const
virtual Int_tGetContour(Double_t* levels = 0)
virtual Double_tGetContourLevel(Int_t level) const
static TF1*TF1::GetCurrent()
virtual Option_t*TObject::GetDrawOption() const
static Long_tTObject::GetDtorOnly()
virtual TStringTFormula::GetExpFormula(Option_t* option = "") const
virtual Color_tTAttFill::GetFillColor() const
virtual Style_tTAttFill::GetFillStyle() const
TH1*TF1::GetHistogram() const
virtual const char*TObject::GetIconName() const
virtual const TObject*TFormula::GetLinearPart(Int_t i)
virtual Color_tTAttLine::GetLineColor() const
virtual Style_tTAttLine::GetLineStyle() const
virtual Width_tTAttLine::GetLineWidth() const
virtual Color_tTAttMarker::GetMarkerColor() const
virtual Size_tTAttMarker::GetMarkerSize() const
virtual Style_tTAttMarker::GetMarkerStyle() const
virtual Double_tTF1::GetMaximum(Double_t xmin = 0, Double_t xmax = 0) const
virtual Double_tTF1::GetMaximumX(Double_t xmin = 0, Double_t xmax = 0) const
TMethodCall*TF1::GetMethodCall() const
virtual Double_tTF1::GetMinimum(Double_t xmin = 0, Double_t xmax = 0) const
virtual Double_tTF1::GetMinimumX(Double_t xmin = 0, Double_t xmax = 0) const
virtual voidGetMinimumXY(Double_t& x, Double_t& y)
virtual const char*TNamed::GetName() const
virtual Int_tTF1::GetNDF() const
virtual Int_tTFormula::GetNdim() const
virtual Int_tTFormula::GetNpar() const
virtual Int_tTF1::GetNpx() const
Int_tGetNpy() const
virtual Int_tTFormula::GetNumber() const
virtual Int_tTF1::GetNumberFitPoints() const
virtual Int_tTF1::GetNumberFreeParameters() const
virtual char*GetObjectInfo(Int_t px, Int_t py) const
static Bool_tTObject::GetObjectStat()
virtual Option_t*TObject::GetOption() const
Double_tTFormula::GetParameter(Int_t ipar) const
Double_tTFormula::GetParameter(const char* name) const
virtual Double_t*TFormula::GetParameters() const
virtual voidTFormula::GetParameters(Double_t* params)
TObject*TF1::GetParent() const
virtual Double_tTF1::GetParError(Int_t ipar) const
virtual Double_t*TF1::GetParErrors() const
virtual voidTF1::GetParLimits(Int_t ipar, Double_t& parmin, Double_t& parmax) const
virtual const char*TFormula::GetParName(Int_t ipar) const
virtual Int_tTFormula::GetParNumber(const char* name) const
virtual Double_tTF1::GetProb() const
virtual Int_tTF1::GetQuantiles(Int_t nprobSum, Double_t* q, const Double_t* probSum)
virtual Double_tGetRandom()
virtual Double_tGetRandom(Double_t xmin, Double_t xmax)
virtual voidGetRandom2(Double_t& xrandom, Double_t& yrandom)
virtual voidGetRange(Double_t& xmin, Double_t& xmax) const
virtual voidGetRange(Double_t& xmin, Double_t& ymin, Double_t& xmax, Double_t& ymax) const
virtual voidGetRange(Double_t& xmin, Double_t& ymin, Double_t& zmin, Double_t& xmax, Double_t& ymax, Double_t& zmax) const
virtual Double_tGetSave(const Double_t* x)
virtual const char*TNamed::GetTitle() const
virtual UInt_tTObject::GetUniqueID() const
virtual Double_tTF1::GetX(Double_t y, Double_t xmin = 0, Double_t xmax = 0) const
TAxis*TF1::GetXaxis() const
virtual Double_tTF1::GetXmax() const
virtual Double_tTF1::GetXmin() const
TAxis*TF1::GetYaxis() const
virtual Double_tGetYmax() const
virtual Double_tGetYmin() const
TAxis*TF1::GetZaxis() const
virtual Double_tTF1::GradientPar(Int_t ipar, const Double_t* x, Double_t eps = 0.01)
virtual voidTF1::GradientPar(const Double_t* x, Double_t* grad, Double_t eps = 0.01)
virtual Bool_tTObject::HandleTimer(TTimer* timer)
virtual ULong_tTNamed::Hash() const
virtual voidTObject::Info(const char* method, const char* msgfmt) const
virtual Bool_tTObject::InheritsFrom(const char* classname) const
virtual Bool_tTObject::InheritsFrom(const TClass* cl) const
virtual voidTF1::InitArgs(const Double_t* x, const Double_t* params)
static voidTF1::InitStandardFunctions()
virtual voidTObject::Inspect() constMENU
virtual Double_tIntegral(Double_t a, Double_t b, const Double_t* params = 0, Double_t epsil = 0.000001)
virtual Double_tIntegral(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsil = 0.000001)
virtual Double_tIntegral(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t az, Double_t bz, Double_t epsil = 0.000001)
virtual Double_tTF1::IntegralError(Double_t a, Double_t b, Double_t epsilon = 1e-12)
virtual Double_tTF1::IntegralFast(Int_t num, Double_t* x, Double_t* w, Double_t a, Double_t b, Double_t* params = 0, Double_t epsilon = 1e-12)
virtual Double_tTF1::IntegralMultiple(Int_t n, const Double_t* a, const Double_t* b, Double_t epsilon, Double_t& relerr)
virtual Double_tTF1::IntegralMultiple(Int_t n, const Double_t* a, const Double_t* b, Int_t minpts, Int_t maxpts, Double_t epsilon, Double_t& relerr, Int_t& nfnevl, Int_t& ifail)
voidTObject::InvertBit(UInt_t f)
virtual TClass*IsA() const
virtual Bool_tTObject::IsEqual(const TObject* obj) const
virtual Bool_tTObject::IsFolder() const
virtual Bool_tIsInside(const Double_t* x) const
virtual Bool_tTFormula::IsLinear()
virtual Bool_tTFormula::IsNormalized()
Bool_tTObject::IsOnHeap() const
virtual Bool_tTNamed::IsSortable() const
virtual Bool_tTAttFill::IsTransparent() const
Bool_tTObject::IsZombie() const
virtual voidTNamed::ls(Option_t* option = "") const
voidTObject::MayNotUse(const char* method) const
virtual Double_tTF1::Mean(Double_t a, Double_t b, const Double_t* params = 0, Double_t epsilon = 0.000001)
virtual Double_tMean2X(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsilon = 0.000001)
virtual Double_tMean2Y(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsilon = 0.000001)
virtual voidTAttLine::Modify()
virtual Double_tTF1::Moment(Double_t n, Double_t a, Double_t b, const Double_t* params = 0, Double_t epsilon = 0.000001)
virtual Double_tMoment2(Double_t nx, Double_t ax, Double_t bx, Double_t ny, Double_t ay, Double_t by, Double_t epsilon = 0.000001)
virtual Bool_tTObject::Notify()
static voidTObject::operator delete(void* ptr)
static voidTObject::operator delete(void* ptr, void* vp)
static voidTObject::operator delete[](void* ptr)
static voidTObject::operator delete[](void* ptr, void* vp)
void*TObject::operator new(size_t sz)
void*TObject::operator new(size_t sz, void* vp)
void*TObject::operator new[](size_t sz)
void*TObject::operator new[](size_t sz, void* vp)
virtual Double_tTF1::operator()(const Double_t* x, const Double_t* params = 0)
virtual Double_tTF1::operator()(Double_t x, Double_t y = 0, Double_t z = 0, Double_t t = 0) const
TF2&operator=(const TF2& rhs)
voidTFormula::Optimize()
virtual voidPaint(Option_t* option = "")
virtual voidTObject::Pop()
virtual voidTF1::Print(Option_t* option = "") const
virtual voidTFormula::ProcessLinear(TString& replaceformula)
virtual Int_tTObject::Read(const char* name)
virtual voidTObject::RecursiveRemove(TObject* obj)
static Bool_tTF1::RejectedPoint()
static voidTF1::RejectPoint(Bool_t reject = kTRUE)
virtual voidTF1::ReleaseParameter(Int_t ipar)
virtual voidTAttFill::ResetAttFill(Option_t* option = "")
virtual voidTAttLine::ResetAttLine(Option_t* option = "")
virtual voidTAttMarker::ResetAttMarker(Option_t* toption = "")
voidTObject::ResetBit(UInt_t f)
virtual voidSave(Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Double_t zmin, Double_t zmax)
virtual voidTObject::SaveAs(const char* filename = "", Option_t* option = "") constMENU
virtual voidTAttFill::SaveFillAttributes(ostream& out, const char* name, Int_t coldef = 1, Int_t stydef = 1001)
virtual voidTAttLine::SaveLineAttributes(ostream& out, const char* name, Int_t coldef = 1, Int_t stydef = 1, Int_t widdef = 1)
virtual voidTAttMarker::SaveMarkerAttributes(ostream& out, const char* name, Int_t coldef = 1, Int_t stydef = 1, Int_t sizdef = 1)
virtual voidSavePrimitive(ostream& out, Option_t* option = "")
voidTObject::SetBit(UInt_t f)
voidTObject::SetBit(UInt_t f, Bool_t set)
virtual voidTF1::SetChisquare(Double_t chi2)
virtual voidSetContour(Int_t nlevels = 20, const Double_t* levels = 0)
virtual voidSetContourLevel(Int_t level, Double_t value)
static voidTF1::SetCurrent(TF1* f1)
virtual voidTObject::SetDrawOption(Option_t* option = "")MENU
static voidTObject::SetDtorOnly(void* obj)
virtual voidTAttFill::SetFillAttributes()MENU
virtual voidTAttFill::SetFillColor(Color_t fcolor)
virtual voidTAttFill::SetFillStyle(Style_t fstyle)
virtual voidTAttLine::SetLineAttributes()MENU
virtual voidTAttLine::SetLineColor(Color_t lcolor)
virtual voidTAttLine::SetLineStyle(Style_t lstyle)
virtual voidTAttLine::SetLineWidth(Width_t lwidth)
virtual voidTAttMarker::SetMarkerAttributes()MENU
virtual voidTAttMarker::SetMarkerColor(Color_t tcolor = 1)
virtual voidTAttMarker::SetMarkerSize(Size_t msize = 1)
virtual voidTAttMarker::SetMarkerStyle(Style_t mstyle = 1)
static voidTFormula::SetMaxima(Int_t maxop = 1000, Int_t maxpar = 1000, Int_t maxconst = 1000)
virtual voidTF1::SetMaximum(Double_t maximum = -1111)MENU
virtual voidTF1::SetMinimum(Double_t minimum = -1111)MENU
virtual voidTNamed::SetName(const char* name)MENU
virtual voidTNamed::SetNameTitle(const char* name, const char* title)
virtual voidTF1::SetNDF(Int_t ndf)
virtual voidTF1::SetNpx(Int_t npx = 100)MENU
virtual voidSetNpy(Int_t npy = 100)MENU
virtual voidTFormula::SetNumber(Int_t number)
virtual voidTF1::SetNumberFitPoints(Int_t npfits)
static voidTObject::SetObjectStat(Bool_t stat)
virtual voidTFormula::SetParameter(const char* name, Double_t parvalue)
virtual voidTFormula::SetParameter(Int_t ipar, Double_t parvalue)
virtual voidTFormula::SetParameters(const Double_t* params)
virtual voidTFormula::SetParameters(Double_t p0, Double_t p1, Double_t p2 = 0, Double_t p3 = 0, Double_t p4 = 0, Double_t p5 = 0, Double_t p6 = 0, Double_t p7 = 0, Double_t p8 = 0, Double_t p9 = 0, Double_t p10 = 0)MENU
virtual voidTF1::SetParent(TObject* p = 0)
virtual voidTF1::SetParError(Int_t ipar, Double_t error)
virtual voidTF1::SetParErrors(const Double_t* errors)
virtual voidTF1::SetParLimits(Int_t ipar, Double_t parmin, Double_t parmax)
virtual voidTFormula::SetParName(Int_t ipar, const char* name)
virtual voidTFormula::SetParNames(const char* name0 = "p0", const char* name1 = "p1", const char* name2 = "p2", const char* name3 = "p3", const char* name4 = "p4", const char* name5 = "p5", const char* name6 = "p6", const char* name7 = "p7", const char* name8 = "p8", const char* name9 = "p9", const char* name10 = "p10")MENU
virtual voidSetRange(Double_t xmin, Double_t xmax)
virtual voidSetRange(Double_t xmin, Double_t ymin, Double_t xmax, Double_t ymax)MENU
virtual voidSetRange(Double_t xmin, Double_t ymin, Double_t zmin, Double_t xmax, Double_t ymax, Double_t zmax)
virtual voidTF1::SetSavedPoint(Int_t point, Double_t value)
virtual voidTF1::SetTitle(const char* title = "")MENU
virtual voidTObject::SetUniqueID(UInt_t uid)
virtual voidShowMembers(TMemberInspector& insp, char* parent)
virtual Int_tTNamed::Sizeof() const
virtual voidStreamer(TBuffer& b)
voidStreamerNVirtual(TBuffer& b)
virtual voidTObject::SysError(const char* method, const char* msgfmt) const
Bool_tTObject::TestBit(UInt_t f) const
Int_tTObject::TestBits(UInt_t f) const
virtual voidTF1::Update()
virtual voidTObject::UseCurrentStyle()
virtual Double_tTF1::Variance(Double_t a, Double_t b, const Double_t* params = 0, Double_t epsilon = 0.000001)
virtual Double_tVariance2X(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsilon = 0.000001)
virtual Double_tVariance2Y(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsilon = 0.000001)
virtual voidTObject::Warning(const char* method, const char* msgfmt) const
virtual Int_tTObject::Write(const char* name = 0, Int_t option = 0, Int_t bufsize = 0)
virtual Int_tTObject::Write(const char* name = 0, Int_t option = 0, Int_t bufsize = 0) const
protected:
voidTFormula::ClearFormula(Option_t* option = "")
virtual voidTFormula::Convert(UInt_t fromVersion)
voidTF1::CreateFromCintClass(const char* name, void* ptr, Double_t xmin, Double_t xmax, Int_t npar, const char* cname, const char* fname)
voidTF1::CreateFromFunctor(const char* name, Int_t npar)
virtual voidTObject::DoError(int level, const char* location, const char* fmt, va_list va) const
Double_tTFormula::EvalParFast(const Double_t* x, const Double_t* params)
Double_tTFormula::EvalPrimitive(const Double_t* x, const Double_t* params)
Double_tTFormula::EvalPrimitive0(const Double_t* x, const Double_t* params)
Double_tTFormula::EvalPrimitive1(const Double_t* x, const Double_t* params)
Double_tTFormula::EvalPrimitive2(const Double_t* x, const Double_t* params)
Double_tTFormula::EvalPrimitive3(const Double_t* x, const Double_t* params)
Double_tTFormula::EvalPrimitive4(const Double_t* x, const Double_t* params)
Short_tTFormula::GetAction(Int_t code) const
Short_tTFormula::GetActionOptimized(Int_t code) const
Int_tTFormula::GetActionParam(Int_t code) const
Int_tTFormula::GetActionParamOptimized(Int_t code) const
Int_t*TFormula::GetOper() const
Int_t*TFormula::GetOperOptimized() const
virtual Bool_tTFormula::IsString(Int_t oper) const
voidTFormula::MakePrimitive(const char* expr, Int_t pos)
voidTObject::MakeZombie()
Int_tTFormula::PreCompile()
voidTFormula::SetAction(Int_t code, Int_t value, Int_t param = 0)
voidTFormula::SetActionOptimized(Int_t code, Int_t value, Int_t param = 0)

Data Members

public:
enum TF1::[unnamed] { kNotDraw
};
enum TFormula::[unnamed] { kEnd
kAdd
kSubstract
kMultiply
kDivide
kModulo
kcos
ksin
ktan
kacos
kasin
katan
katan2
kfmod
kpow
ksq
ksqrt
kstrstr
kmin
kmax
klog
kexp
klog10
kpi
kabs
ksign
kint
kSignInv
krndm
kAnd
kOr
kEqual
kNotEqual
kLess
kGreater
kLessThan
kGreaterThan
kNot
kcosh
ksinh
ktanh
kacosh
kasinh
katanh
kStringEqual
kStringNotEqual
kBitAnd
kBitOr
kLeftShift
kRightShift
kexpo
kxexpo
kyexpo
kzexpo
kxyexpo
kgaus
kxgaus
kygaus
kzgaus
kxygaus
klandau
kxlandau
kylandau
kzlandau
kxylandau
kpol
kxpol
kypol
kzpol
kParameter
kConstant
kBoolOptimize
kStringConst
kVariable
kFunctionCall
kData
kUnary
kBinary
kThree
kDefinedVariable
kDefinedString
kPlusD
kPlusDD
kMultD
kMultDD
kBoolOptimizeOr
kBoolOptimizeAnd
kBoolSet
kFDM
kFD0
kFD1
kFD2
kFD3
kNotGlobal
kNormalized
kLinear
};
enum TObject::EStatusBits { kCanDelete
kMustCleanup
kObjInCanvas
kIsReferenced
kHasUUID
kCannotPick
kNoContextMenu
kInvalidObject
};
enum TObject::[unnamed] { kIsOnHeap
kNotDeleted
kZombie
kBitMask
kSingleKey
kOverwrite
kWriteDelete
};
public:
G__p2memfuncTFormula::fOptimal!pointer to optimal function
protected:
Double_t*TF1::fAlpha!Array alpha. for each bin in x the deconvolution r of fIntegral
TBitsTFormula::fAlreadyFound! cache for information
Double_t*TF1::fBeta!Array beta. is approximated by x = alpha +beta*r *gamma*r**2
Double_tTF1::fChisquareFunction fit chisquare
void*TF1::fCintFunc! pointer to interpreted function class
Double_t*TFormula::fConst[fNconst] Array of fNconst formula constants
TArrayDfContourArray to display contour levels
TString*TFormula::fExpr[fNoper] List of expressions
TString*TFormula::fExprOptimized![fNOperOptimized] List of expressions
Color_tTAttFill::fFillColorfill area color
Style_tTAttFill::fFillStylefill area style
TObjArrayTFormula::fFunctionsArray of function calls to make
ROOT::Math::ParamFunctorTF1::fFunctor! Functor object to wrap any C++ callable object
Double_t*TF1::fGamma!Array gamma.
TH1*TF1::fHistogram!Pointer to histogram used for visualisation
Double_t*TF1::fIntegral![fNpx] Integral of function binned on fNpx bins
Color_tTAttLine::fLineColorline color
Style_tTAttLine::fLineStyleline style
Width_tTAttLine::fLineWidthline width
TObjArrayTFormula::fLinearParts! Linear parts if the formula is linear (contains '|')
Color_tTAttMarker::fMarkerColorMarker color index
Size_tTAttMarker::fMarkerSizeMarker size
Style_tTAttMarker::fMarkerStyleMarker style
Double_tTF1::fMaximumMaximum value for plotting
TMethodCall*TF1::fMethodCall!Pointer to MethodCall in case of interpreted function
Double_tTF1::fMinimumMinimum value for plotting
Int_tTF1::fNDFNumber of degrees of freedom in the fit
Int_tTFormula::fNOperOptimized!Number of operators after optimization
TStringTNamed::fNameobject identifier
TString*TFormula::fNames[fNpar] Array of parameter names
Int_tTFormula::fNconstNumber of constants
Int_tTFormula::fNdimDimension of function (1=1-Dim, 2=2-Dim,etc)
Int_tTFormula::fNoperNumber of operators
Int_tTFormula::fNparNumber of parameters
Int_tTF1::fNpfitsNumber of points used in the fit
Int_tTF1::fNpxNumber of points used for the graphical representation
Int_tfNpyNumber of points along y used for the graphical representation
Int_tTF1::fNsaveNumber of points used to fill array fSave
Int_tTFormula::fNstringNumber of different constants character strings
Int_tTFormula::fNumberformula number identifier
Int_tTFormula::fNvalNumber of different variables in expression
TOperOffset*TFormula::fOperOffset![fNOperOptimized] Offsets of operrands
Int_t*TFormula::fOperOptimized![fNOperOptimized] List of operators. (See documentation for changes made at version 7)
Double_t*TF1::fParErrors[fNpar] Array of errors of the fNpar parameters
Double_t*TF1::fParMax[fNpar] Array of upper limits of the fNpar parameters
Double_t*TF1::fParMin[fNpar] Array of lower limits of the fNpar parameters
Double_t*TFormula::fParams[fNpar] Array of fNpar parameters
TObject*TF1::fParent!Parent object hooking this function (if one)
TFormulaPrimitive**TFormula::fPredefined![fNPar] predefined function
Double_t*TF1::fSave[fNsave] Array of fNsave function values
TStringTNamed::fTitleobject title
Int_tTF1::fType(=0 for standard functions, 1 if pointer to function)
Double_tTF1::fXmaxUpper bounds for the range
Double_tTF1::fXminLower bounds for the range
Double_tfYmaxUpper bound for the range in y
Double_tfYminLower bound for the range in y
static Bool_tTF1::fgAbsValueuse absolute value of function when computing integral
static TF1*TF1::fgCurrentpointer to current function being processed
static Bool_tTF1::fgRejectPointTrue if point must be rejected in a fit

Class Charts

Inheritance Inherited Members Includes Libraries
Class Charts

Function documentation

TF2(const TF2& f2)
F2 default constructor*-*-*-*-*-*-
*-*                  ======================
TF2(const char* name, const char* formula, Double_t xmin = 0, Double_t xmax = 1, Double_t ymin = 0, Double_t ymax = 1)
 F2 constructor using a formula definition

  See TFormula constructor for explanation of the formula syntax.

  if formula has the form "fffffff;xxxx;yyyy", it is assumed that
  the formula string is "fffffff" and "xxxx" and "yyyy" are the
  titles for the X and Y axis respectively.
TF2(const char *name, void *fcn, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Int_t npar)
-*-*-*-*F2 constructor using a pointer to an interpreted function
*-*          =========================================================
-
*-*   npar is the number of free parameters used by the function
-
*-*  Creates a function of type C between xmin and xmax and ymin,ymax.
*-*  The function is defined with npar parameters
*-*  fcn must be a function of type:
*-*     Double_t fcn(Double_t *x, Double_t *params)
-
*-*  This constructor is called for functions of type C by CINT.
-
*-* WARNING! A function created with this constructor cannot be Cloned.
-
-
TF2(const char* name, void* ptr, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Int_t npar, char* className)
-*-*F2 constructor using a pointer to a compiled function
*-*          =====================================================
-
*-*   npar is the number of free parameters used by the function
-
*-*   This constructor creates a function of type C when invoked
*-*   with the normal C++ compiler.
-
*-* WARNING! A function created with this constructor cannot be Cloned.
-
-
TF2(const char* name, void* ptr, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Int_t npar, char* className)
-*-*F2 constructor using a pointer to a compiled function
*-*          =====================================================
-
*-*   npar is the number of free parameters used by the function
-
*-*   This constructor creates a function of type C when invoked
*-*   with the normal C++ compiler.
-
*-* WARNING! A function created with this constructor cannot be Cloned.
-
-
TF2(const char *name, ROOT::Math::ParamFunctor f, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Int_t npar)
*-*-*-*-*-*-*F2 constructor using a ParamFunctor,
*-*          a functor class implementing operator() (double *, double *)
-
*-*   npar is the number of free parameters used by the function
-
*-* WARNING! A function created with this constructor cannot be Cloned.
-
TF2(const char* name, void* ptr, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Int_t npar, char* className)
*-*-*-*-*-*-*F2 constructor used by CINT for interpreted function objects
*-*          Used for having same syntax as the template constructor from callable C++ objects
*-*          which can be used only in compile C++ mode.
-
*-*   npar is the number of free parameters used by the function
-
*-* WARNING! A function created with this constructor cannot be Cloned.
-
TF2& operator=(const TF2& rhs)
 Operator =
~TF2()
F2 default destructor*-*-*-*-*-*-
*-*                  =====================
void Copy(TObject& f2) const
Copy this F2 to a new F2*-*-*-*-*-
*-*                  ========================
Int_t DistancetoPrimitive(Int_t px, Int_t py)
-*-*-*-*-*-*Compute distance from point px,py to a function
*-*                  ===============================================
*-*  Compute the closest distance of approach from point px,py to this function.
*-*  The distance is computed in pixels units.
-
*-*  Algorithm:
-
-
*
void Draw(Option_t* option = "")
-*-*-*-*-*-*Draw this function with its current attributes
*-*                  ==============================================
*-* NB. You must use DrawCopy if you want to draw several times the same
*-*     function in the current canvas.
*
TF1 * DrawCopy(Option_t* option = "") const
-*-*-*-*-*Draw a copy of this function with its current attributes
*-*            ========================================================
-
*-*  This function MUST be used instead of Draw when you want to draw
*-*  the same function with different parameters settings in the same canvas.
-
*-* Possible option values are:
*-*   "SAME"  superimpose on top of existing picture
*-*   "L"     connect all computed points with a straight line
*-*   "C"     connect all computed points with a smooth curve.
-
*-* Note that the default value is "F". Therefore to draw on top
*-* of an existing picture, specify option "SL"
-
*
void DrawF2(const char* formula, Double_t xmin, Double_t xmax, Double_t ymin, Double_t ymax, Option_t* option = "")
-*-*Draw formula between xmin,ymin and xmax,ymax
*-*                ============================================
-
void ExecuteEvent(Int_t event, Int_t px, Int_t py)
-*-*-*-*-*-*-*Execute action corresponding to one event
*-*                  =========================================
*-*  This member function is called when a F2 is clicked with the locator
-
*
Int_t GetContour(Double_t* levels = 0)
Return contour values into array levels*-*-
*-*            =======================================
-
*-*  The number of contour levels can be returned by getContourLevel
-
*
Double_t GetContourLevel(Int_t level) const
Return the number of contour levels*-*-*-*-*-
*-*            ===================================
void GetMinimumXY(Double_t& x, Double_t& y)
 return the X and Y values corresponding to the minimum value of the function
 To find the minimum on a range, first set this range via the SetRange function
 Method:
   First, a grid search is performed to find the initial estimate of the
   minimum location. The range of the function is divided into fNpx and fNpy
   sub-ranges. If the function is "good"(or "bad"), these values can be changed
   by SetNpx and SetNpy functions
   Then, Minuit minimization is used with starting values found by the grid search
char * GetObjectInfo(Int_t px, Int_t py) const
   Redefines TObject::GetObjectInfo.
   Displays the function value
   corresponding to cursor position px,py

Double_t GetRandom()
Return a random number following this function shape*-
*-*        ====================================================
-
Double_t GetRandom(Double_t xmin, Double_t xmax)
Return a random number following this function shape*-
*-*        ====================================================
-
void GetRandom2(Double_t& xrandom, Double_t& yrandom)
Return 2 random numbers following this function shape
*-*        =====================================================
-
*-*   The distribution contained in this TF2 function is integrated
*-*   over the cell contents.
*-*   It is normalized to 1.
*-*   Getting the two random numbers implies:
*-*     - Generating a random number between 0 and 1 (say r1)
*-*     - Look in which cell in the normalized integral r1 corresponds to
*-*     - make a linear interpolation in the returned cell
-
-
*-*  IMPORTANT NOTE
*-*  The integral of the function is computed at fNpx * fNpy points.
*-*  If the function has sharp peaks, you should increase the number of
*-*  points (SetNpx, SetNpy) such that the peak is correctly tabulated
*-*  at several points.
void GetRange(Double_t& xmin, Double_t& ymin, Double_t& xmax, Double_t& ymax) const
Return range of a 2-D function*-*-
*-*                  ==============================
void GetRange(Double_t& xmin, Double_t& ymin, Double_t& zmin, Double_t& xmax, Double_t& ymax, Double_t& zmax) const
Return range of function*-*-*-*-
*-*                  ========================
Double_t GetSave(const Double_t* x)
 Get value corresponding to X in array of fSave values
Double_t Integral(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsil = 0.000001)
 Return Integral of a 2d function in range [ax,bx],[ay,by]

Bool_t IsInside(const Double_t* x) const
 Return kTRUE is the point is inside the function range
TH1* CreateHistogram()
 Create a histogram from function.
void Paint(Option_t* option = "")
-*-*-*-*Paint this 2-D function with its current attributes
*-*              ===================================================
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
void SavePrimitive(ostream& out, Option_t* option = "")
 Save primitive as a C++ statement(s) on output stream out
void SetContour(Int_t nlevels = 20, const Double_t* levels = 0)
Set the number and values of contour levels*-
*-*            ===========================================

  By default the number of contour levels is set to 20.

  if argument levels = 0 or missing, equidistant contours are computed

void SetContourLevel(Int_t level, Double_t value)
Set value for one contour level*-
*-*                  ===============================
void SetNpy(Int_t npy = 100)
 Set the number of points used to draw the function

 The default number of points along x is 30 for 2-d/3-d functions.
 You can increase this value to get a better resolution when drawing
 pictures with sharp peaks or to get a better result when using TF2::GetRandom2
 the minimum number of points is 4, the maximum is 10000 for 2-d/3-d functions
void SetRange(Double_t xmin, Double_t ymin, Double_t xmax, Double_t ymax)
-*-*Initialize the upper and lower bounds to draw the function
*-*        ==========================================================
void Streamer(TBuffer& b)
 Stream an object of class TF2.
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]
   Author: Gene Van Buren <gene@bnl.gov>
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]
   Author: Gene Van Buren <gene@bnl.gov>
void SetRange(Double_t xmin, Double_t xmax)
{ TF1::SetRange(xmin, xmax); }
void SetRange(Double_t xmin, Double_t ymin, Double_t zmin, Double_t xmax, Double_t ymax, Double_t zmax)
{ SetRange(xmin, ymin, xmax, ymax); }
void DrawDerivative(Option_t* = "al")
{;}
void DrawIntegral(Option_t* = "al")
{;}
Int_t GetNpy()
{return fNpy;}
void GetRange(Double_t& xmin, Double_t& xmax) const
{ TF1::GetRange(xmin, xmax); }
Double_t GetYmin()
{return fYmin;}
Double_t GetYmax()
{return fYmax;}
Double_t Integral(Double_t a, Double_t b, const Double_t* params = 0, Double_t epsil = 0.000001)
{return TF1::Integral(a,b,params,epsil);}
Double_t Integral(Double_t ax, Double_t bx, Double_t ay, Double_t by, Double_t epsil = 0.000001)
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);}
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);}
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);}
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);}
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);}

Author: Rene Brun 23/08/95
Last change: root/hist:$Id: TF2.h 26166 2008-11-12 16:25:31Z brun $
Last generated: 2008-11-12 17:28
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *

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