You must supply this method to calculate the elements of the symmetric matrix
Bx=∑i=1mfixGix,
at any point x, where Gix is the Hessian matrix of fix. It should be tested separately before being used in conjunction with e04hy (see the E04 class).

Syntax

C#
public delegate void E04HY_LSHES2(
	int m,
	int n,
	double[] fvec,
	double[] xc,
	double[] b
)
Visual Basic
Public Delegate Sub E04HY_LSHES2 ( _
	m As Integer, _
	n As Integer, _
	fvec As Double(), _
	xc As Double(), _
	b As Double() _
)
Visual C++
public delegate void E04HY_LSHES2(
	int m, 
	int n, 
	array<double>^ fvec, 
	array<double>^ xc, 
	array<double>^ b
)
F#
type E04HY_LSHES2 = 
    delegate of 
        m : int * 
        n : int * 
        fvec : float[] * 
        xc : float[] * 
        b : float[] -> unit

Parameters

m
Type: System..::..Int32
On entry: m, the number of residuals.
n
Type: System..::..Int32
On entry: n, the number of residuals.
fvec
Type: array<System..::..Double>[]()[][]
On entry: the value of the residual fi at the point x, for i=1,2,…,m, so that the values of the fi can be used in the calculation of the elements of b.
xc
Type: array<System..::..Double>[]()[][]
On entry: the point x at which the elements of b are to be evaluated.
b
Type: array<System..::..Double>[]()[][]
On exit: must contain the lower triangle of the matrix Bx, evaluated at the point x, stored by rows. (The upper triangle is not required because the matrix is symmetric.) More precisely, b[jj-1/2+k-1] must contain ∑i=1mfi∂2fi∂xj∂xk evaluated at the point x, for j=1,2,…,n and k=1,2,…,j.

See Also