E04.E04HD_H Delegate
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h must evaluate the second derivatives of the function at a given point. (As with funct, a parameter can be set to cause immediate termination.)

Syntax

C#
public delegate void E04HD_H(
	ref int iflag,
	int n,
	double[] xc,
	double[] fhesl,
	double[] fhesd
)
Visual Basic (Declaration)
Public Delegate Sub E04HD_H ( _
	ByRef iflag As Integer, _
	n As Integer, _
	xc As Double(), _
	fhesl As Double(), _
	fhesd As Double() _
)
Visual C++
public delegate void E04HD_H(
	int% iflag, 
	int n, 
	array<double>^ xc, 
	array<double>^ fhesl, 
	array<double>^ fhesd
)
F#
type E04HD_H = 
    delegate of 
        iflag:int byref * 
        n:int * 
        xc:float[] * 
        fhesl:float[] * 
        fhesd:float[] -> unit

Parameters

iflag
Type: System..::.Int32 %
On entry: is set to a non-negative number.
On exit: if h resets iflag to a negative number, e04hd 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 the second derivatives of Fx are required.
fhesl
Type: array< System..::.Double >[]()[]
On exit: unless iflag is reset, h must place the strict lower triangle of the second derivative matrix of F (evaluated at the point x) in fhesl, stored by rows, i.e., fhesl[i-1i-2/2+j-1] must be set to the value of ∂2F ∂xi∂xj  at the point x, for i=2,3,…,n and j=1,2,…,i-1. (The upper triangle is not required because the matrix is symmetric.)
fhesd
Type: array< System..::.Double >[]()[]
On entry: contains the value of ∂F ∂xj  at the point x, for j=1,2,…,n. Methods written to take advantage of a similar feature of e04lb can be tested as they stand by e04hd.
On exit: unless iflag is reset, h must place the diagonal elements of the second derivative matrix of F (evaluated at the point x) in fhesd, i.e., fhesd[j-1] must be set to the value of ∂2F ∂xj2  at the point x, for j=1,2,…,n.

See Also