class ROOT::Math::GaussIntegrator: public ROOT::Math::VirtualIntegratorOneDim

 Destructor. Deletes the function if it was previously copied. 

 Default Constructor. 

 Static function: set the fgAbsValue flag.
       By default TF1::Integral uses the original function value to compute the integral
       However, TF1::Moment, CentralMoment require to compute the integral
       using the absolute value of the function.

 Implementing VirtualIntegrator Interface
 Set the desired relative Error. 

 This method is not implemented. 

 Returns the result of the last Integral calculation. 

 Return the estimate of the absolute Error of the last Integral calculation. 

 This method is not implemented. 

 Implementing VirtualIntegratorOneDim Interface
 Return Integral of function between a and b.

       Based on original CERNLIB routine DGAUSS by Sigfried Kolbig
       converted to C++ by Rene Brun

      This function computes, to an attempted specified accuracy, the value
      of the integral.


      Usage:
        In any arithmetic expression, this function has the approximate value
        of the integral I.
        - A, B: End-points of integration interval. Note that B may be less
                than A.
        - params: Array of function parameters. If 0, use current parameters.
        - epsilon: Accuracy parameter (see Accuracy).

     Method:
        For any interval [a,b] we define g8(a,b) and g16(a,b) to be the 8-point
        and 16-point Gaussian quadrature approximations to


        and define


        Then,


        where, starting with x0 = A and finishing with xk = B,
        the subdivision points xi(i=1,2,...) are given by


         is equal to the first member of the
        sequence 1,1/2,1/4,... for which r(xi-1, xi) < EPS.
        If, at any stage in the process of subdivision, the ratio


        is so small that 1+0.005q is indistinguishable from 1 to
        machine accuracy, an error exit occurs with the function value
        set equal to zero.

      Accuracy:
        Unless there is severe cancellation of positive and negative values of
        f(x) over the interval [A,B], the relative error may be considered as
        specifying a bound on the <I>relative</I> error of I in the case
        |I|&gt;1, and a bound on the absolute error in the case |I|&lt;1. More
        precisely, if k is the number of sub-intervals contributing to the
        approximation (see Method), and if


        then the relation


        will nearly always be true, provided the routine terminates without
        printing an error message. For functions f having no singularities in
        the closed interval [A,B] the accuracy will usually be much higher than
        this.

      Error handling:
        The requested accuracy cannot be obtained (see Method).
        The function value is set equal to zero.

      Note 1:
        Values of the function f(x) at the interval end-points A and B are not
        required. The subprogram may therefore be used when these values are
        undefined.

 Set integration function (flag control if function must be copied inside).
       \@param f Function to be used in the calculations.
       \@param copy Indicates whether the function has to be copied.

 This method is not implemented. 

 This method is not implemented. 

This method is not implemented. 

 This method is not implemented. 

 This method is not implemented.