e04ugn Method
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nAG supplied method for use with the callback parameter: objfun.

Syntax

C#
public static void e04ugn(
	ref int mode,
	int nonln,
	double[] x,
	ref double objf,
	double[] objgrd,
	int nstate
)
Visual Basic (Declaration)
Public Shared Sub e04ugn ( _
	ByRef mode As Integer, _
	nonln As Integer, _
	x As Double(), _
	ByRef objf As Double, _
	objgrd As Double(), _
	nstate As Integer _
)
Visual C++
public:
static void e04ugn(
	int% mode, 
	int nonln, 
	array<double>^ x, 
	double% objf, 
	array<double>^ objgrd, 
	int nstate
)
F#
static member e04ugn : 
        mode:int byref * 
        nonln:int * 
        x:float[] * 
        objf:float byref * 
        objgrd:float[] * 
        nstate:int -> unit

Parameters

mode
Type: System..::.Int32 %
On entry: indicates which values must be assigned during each call of objfun. Only the following values need be assigned:
mode=0
objf.
mode=1
All available elements of objgrd.
mode=2
objf and all available elements of objgrd.
On exit: you may set to a negative value as follows:
mode≤-2
The solution to the current problem is terminated and in this case e04ugn will terminate with ifail set to mode.
mode=-1
The nonlinear part of the objective function cannot be calculated at the current x. e04ugn will then terminate with ifail=-1 unless this occurs during the linesearch; in this case, the linesearch will shorten the step and try again.
nonln
Type: System..::.Int32
On entry: n1′, the number of nonlinear objective variables. These must be the first nonln variables in the problem.
x
Type: array< System..::.Double >[]()[]
An array of size [nonln]
On entry: x, the vector of nonlinear variables at which the nonlinear part of the objective function and/or all available elements of its gradient are to be evaluated.
objf
Type: System..::.Double %
On exit: if mode=0 or 2, objf must be set to the value of the objective function at x.
objgrd
Type: array< System..::.Double >[]()[]
An array of size [nonln]
On entry: the elements of objgrd are set to special values which enable e04ugn to detect whether they are changed by objfun.
On exit: if mode=1 or 2, objgrd must return the available elements of the gradient evaluated at x.
nstate
Type: System..::.Int32
On entry: if nstate=1, e04ugn is calling objfun for the first time. This parameter setting allows you to save computation time if certain data must be read or calculated only once.
If nstate≥2, e04ugn is calling objfun for the last time. This parameter setting allows you to perform some additional computation on the final solution. In general, the last call to objfun is made with nstate=2+ (see [Error Indicators and Warnings]).
Otherwise, nstate=0.

Error Indicators and Warnings

Accuracy

Further Comments

See Also