class TF2: public TF1

F2 default constructor*-*-*-*-*-*-
*-*                  ======================

 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.

-*-*-*-*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.
-
-

-*-*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.
-
-

-*-*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.
-
-

*-*-*-*-*-*-*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.
-

*-*-*-*-*-*-*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.
-

 Operator =

F2 default destructor*-*-*-*-*-*-
*-*                  =====================

Copy this F2 to a new F2*-*-*-*-*-
*-*                  ========================

-*-*-*-*-*-*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:
-
-
*

-*-*-*-*-*-*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.
*

-*-*-*-*-*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"
-
*

-*-*Draw formula between xmin,ymin and xmax,ymax
*-*                ============================================
-

-*-*-*-*-*-*-*Execute action corresponding to one event
*-*                  =========================================
*-*  This member function is called when a F2 is clicked with the locator
-
*

Return contour values into array levels*-*-
*-*            =======================================
-
*-*  The number of contour levels can be returned by getContourLevel
-
*

Return the number of contour levels*-*-*-*-*-
*-*            ===================================

 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

   Redefines TObject::GetObjectInfo.
   Displays the function value
   corresponding to cursor position px,py

Return a random number following this function shape*-
*-*        ====================================================
-

Return a random number following this function shape*-
*-*        ====================================================
-

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.

Return range of a 2-D function*-*-
*-*                  ==============================

Return range of function*-*-*-*-
*-*                  ========================

 Get value corresponding to X in array of fSave values

 Return Integral of a 2d function in range [ax,bx],[ay,by]

 Return kTRUE is the point is inside the function range

 Create a histogram from function.

-*-*-*-*Paint this 2-D function with its current attributes
*-*              ===================================================

 Save values of function in array fSave

 Save primitive as a C++ statement(s) on output stream out

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

Set value for one contour level*-
*-*                  ===============================

 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

-*-*Initialize the upper and lower bounds to draw the function
*-*        ==========================================================

 Stream an object of class TF2.

 Return x^nx * y^ny moment of a 2d function in range [ax,bx],[ay,by]
   Author: Gene Van Buren <gene@bnl.gov>

 Return x^nx * y^ny central moment of a 2d function in range [ax,bx],[ay,by]
   Author: Gene Van Buren <gene@bnl.gov>