E04.E04VJ_USRFUN Delegate
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usrfun must define the problem functions Fx . This method is passed to e04vj as the external parameter usrfun.

Syntax

C#
public delegate void E04VJ_USRFUN(
	ref int status,
	int n,
	double[] x,
	int needf,
	int nf,
	double[] f,
	int needg,
	double[] g
)
Visual Basic (Declaration)
Public Delegate Sub E04VJ_USRFUN ( _
	ByRef status As Integer, _
	n As Integer, _
	x As Double(), _
	needf As Integer, _
	nf As Integer, _
	f As Double(), _
	needg As Integer, _
	g As Double() _
)
Visual C++
public delegate void E04VJ_USRFUN(
	int% status, 
	int n, 
	array<double>^ x, 
	int needf, 
	int nf, 
	array<double>^ f, 
	int needg, 
	array<double>^ g
)
F#
type E04VJ_USRFUN = 
    delegate of 
        status:int byref * 
        n:int * 
        x:float[] * 
        needf:int * 
        nf:int * 
        f:float[] * 
        needg:int * 
        g:float[] -> unit

Parameters

status
Type: System..::.Int32 %
On entry: indicates the first call to usrfun.
status=0
There is nothing special about the current call to usrfun.
status=1
e04vj is calling your method for the first time. Some data may need to be input or computed and saved.
On exit: may be used to indicate that you are unable to evaluate F  at the current x . (For example, the problem functions may not be defined there).
e04vj evaluates Fx  at random perturbation of the initial point x , say xp . If the functions cannot be evaluated at xp , you can set status=-1 , e04vj will use another random perturbation.
If for some reason you wish to terminate the current problem, set status≤-2 .
n
Type: System..::.Int32
On entry: n , the number of variables, as defined in the call to e04vj.
x
Type: array< System..::.Double >[]()[]
On entry: the variables x  at which the problem functions are to be calculated. The array x  must not be altered.
needf
Type: System..::.Int32
On entry: indicates if f must be assigned during the call to usrfun (see f).
nf
Type: System..::.Int32
On entry: nf, the number of problem functions.
f
Type: array< System..::.Double >[]()[]
On entry: this will be set by e04vj.
On exit: the computed Fx  according to the setting of needf.
If needf=0 , f is not required and is ignored.
If needf > 0 , the components of Fx  must be calculated and assigned to f. e04vj will always call usrfun with needf>0 .
To simplify the code, you may ignore the value of needf and compute Fx  on every entry to usrfun.
needg
Type: System..::.Int32
On entry: e04vj will call usrfun with needg=0 to indicate that g is not required.
g
Type: array< System..::.Double >[]()[]
On entry: concerns the calculations of the derivatives of the function fx .
On exit: e04vj will always call usrfun with needg=0 : g is not required to be set on exit but must be declared correctly.

See Also