You must supply this method to calculate the values of

F (x)

and

\frac{d F}{d x}

at any point

x

[a, b]

It should be tested separately before being used in conjunction with e04bb.

Syntax

C#
public delegate void E04BB_FUNCT( double xc, out double fc, out double gc )

Visual Basic
Public Delegate Sub E04BB_FUNCT ( _ xc As Double, _ <OutAttribute> ByRef fc As Double, _ <OutAttribute> ByRef gc As Double _ )

Visual C++
public delegate void E04BB_FUNCT( double xc, [OutAttribute] double% fc, [OutAttribute] double% gc )

F#
type E04BB_FUNCT = delegate of xc : float * fc : float byref * gc : float byref -> unit

xc: Type: System..::..Double
On entry: the point $x$ at which the values of $F$ and $\frac{d F}{d x}$ are required.

fc: Type: System..::..Double%
On exit: must be set to the value of the function $F$ at the current point $x$ .

gc: Type: System..::..Double%
On exit: must be set to the value of the first derivative $\frac{d F}{d x}$ at the current point $x$ .

See Also