funct must evaluate the function and its first derivatives at a given point. (The minimization methods mentioned in [Description] gives you the option of resetting parameters of funct to cause the minimization process to terminate immediately. e04hc will also terminate immediately, without finishing the checking process, if the parameter in question is reset.)

Syntax

C#
public delegate void E04HC_FUNCT(
	ref int iflag,
	int n,
	double[] xc,
	ref double fc,
	double[] gc
)
Visual Basic
Public Delegate Sub E04HC_FUNCT ( _
	ByRef iflag As Integer, _
	n As Integer, _
	xc As Double(), _
	ByRef fc As Double, _
	gc As Double() _
)
Visual C++
public delegate void E04HC_FUNCT(
	int% iflag, 
	int n, 
	array<double>^ xc, 
	double% fc, 
	array<double>^ gc
)
F#
type E04HC_FUNCT = 
    delegate of 
        iflag : int byref * 
        n : int * 
        xc : float[] * 
        fc : float byref * 
        gc : float[] -> unit

Parameters

iflag
Type: System..::..Int32%
On entry: will be set to 2.
On exit: if you reset iflag to a negative number in funct and return control to e04hc, e04hc will terminate immediately with ifail set to your setting of iflag.
n
Type: System..::..Int32
On entry: the number n of variables.
xc
Type: array<System..::..Double>[]()[][]
On entry: the point x at which F and its derivatives are required.
fc
Type: System..::..Double%
On exit: unless funct resets iflag, fc must be set to the value of the function F at the current point x.
gc
Type: array<System..::..Double>[]()[][]
On exit: unless funct resets iflag, gc[j-1] must be set to the value of the first derivative ∂F∂xj at the point x, for j=1,2,…,n.

See Also