Auxiliary for use as a delegate parameter

Syntax

C#
public static void e04nfu( int n, int jthcol, double[,] h, double[] x, double[] hx, E04..::..e04nfOptions options )

Visual Basic
Public Shared Sub e04nfu ( _ n As Integer, _ jthcol As Integer, _ h As Double(,), _ x As Double(), _ hx As Double(), _ options As E04..::..e04nfOptions _ )

Visual C++
public: static void e04nfu( int n, int jthcol, array<double,2>^ h, array<double>^ x, array<double>^ hx, E04..::..e04nfOptions^ options )

F#
static member e04nfu : n : int * jthcol : int * h : float[,] * x : float[] * hx : float[] * options : E04..::..e04nfOptions -> unit

jthcol

Type: System..::..Int32

On entry: specifies whether or not the vector

x

is a column of the identity matrix.

$jthcol = j > 0$: The vector $x$ is the $j$ th column of the identity matrix, and hence $H x$ or $h^{T} H x$ is the $j$ th column of $h$ or $h^{T} H$ , respectively, which may in some cases require very little computation and _qphess may be coded to take advantage of this. However special code is not necessary because $x$ is always stored explicitly in the array x.
$jthcol = 0$: $x$ has no special form.

h: Type: array<System..::..Double,2>[,](,)[,][,]
An array of size [dim1, dim2]
Note: dim1 must satisfy the constraint:
On entry: this is the same parameter h as supplied to e04nf.

x: Type: array<System..::..Double>[]()[][]
An array of size [n]
On entry: $x [j - 1]$ must be set to a guess at the $j$ th component of the position of the minimum, for $j = 1, 2, \dots, n$ . The method checks the gradient and the Hessian matrix at the starting point, and is more likely to detect any error in your programming if the initial $x [j - 1]$ are nonzero and mutually distinct.
On exit: the lowest point found during the calculations. Thus, if $ifail = 0$ on exit, $x [j - 1]$ is the $j$ th component of the position of the minimum.

options: Type: NagLibrary..::..E04..::..e04nfOptions
An Object of type E04.e04nfuOptions. Used to configure optional parameters to this method.

Description

Auxiliary for use as a delegate parameter

None.

Not applicable.

None.

None.