e05jkf is used to get the value of an integer e05jbf optional parameter. e05jkf can be used before or after calling e05jbf, but the initialization routine e05jaf must have been called before calling e05jkf.

2 Specification

Fortran Interface

Subroutine e05jkf (

optstr, ivalue, comm, lcomm, ifail)

Integer, Intent (In)	::	lcomm
Integer, Intent (Inout)	::	ifail
Integer, Intent (Out)	::	ivalue
Real (Kind=nag_wp), Intent (In)	::	comm(lcomm)
Character (*), Intent (In)	::	optstr

C Header Interface

#include <nag.h>

void	e05jkf_ (const char optstr, Integer ivalue, const double comm[], const Integer lcomm, Integer ifail, const Charlen length_optstr)

The routine may be called by the names e05jkf or nagf_glopt_bnd_mcs_optget_int.

3 Description

e05jkf obtains the current value of an integer-valued optional parameter. For example

Call e05jkf ('Local Searches Limit', loclim, comm, lcomm, ifail)

will result in the value of the optional parameter Local Searches Limit being output in LOCLIM.

The default values of the optional parameters Function Evaluations Limit, Splits Limit and Static Limit depend on the problem parameter

n_{r}

(the number of non-fixed variables). A default value for each of these optional parameters will be set in the first call to the solver e05jbf: before that time, getting the value of any of these optional parameters using e05jkf will not return a meaningful result.

A complete list of optional parameters, their symbolic names and default values is given in Section 12 in e05jbf.

4 References

None.

5 Arguments

1: $optstr$ – Character(*) Input: On entry: a string identifying an integer-valued optional parameter (as described in Section 12 in e05jbf).
2: $ivalue$ – Integer Output: On exit: if $ifail = 0$ on exit, ivalue contains the integer value associated with the optional parameter in optstr.
3: $comm (lcomm)$ – Real (Kind=nag_wp) array Communication Array: On entry: communication data as initialized by e05jaf.
4: $lcomm$ – Integer Input: On entry: the dimension of the array comm as declared in the (sub)program from which e05jkf is called.

Constraint: $lcomm \geq 100$ .
5: $ifail$ – Integer Input/Output: On entry: ifail must be set to $0$ , $- 1$ or $1$ to set behaviour on detection of an error; these values have no effect when no error is detected.
A value of $0$ causes the printing of an error message and program execution will be halted; otherwise program execution continues. A value of $- 1$ means that an error message is printed while a value of $1$ means that it is not.

If halting is not appropriate, the value $- 1$ or $1$ is recommended. If message printing is undesirable, then the value $1$ is recommended. Otherwise, the value $0$ is recommended. When the value $- 1$ or $1$ is used it is essential to test the value of ifail on exit.

On exit: $ifail = 0$ unless the routine detects an error or a warning has been flagged (see Section 6).

6 Error Indicators and Warnings

If on entry

ifail = 0

- 1

, explanatory error messages are output on the current error message unit (as defined by x04aaf).

Errors or warnings detected by the routine:

$ifail = 1$: Initialization routine e05jaf has not been called.

On entry, $lcomm = ⟨ value ⟩$ .
Constraint: $lcomm \geq 100$ .

$ifail = 2$: The supplied optional parameter is invalid. A keyword or keyword combination was not recognized.

$ifail = - 99$: An unexpected error has been triggered by this routine. Please contact NAG.
See Section 7 in the Introduction to the NAG Library FL Interface for further information.

$ifail = - 399$: Your licence key may have expired or may not have been installed correctly.
See Section 8 in the Introduction to the NAG Library FL Interface for further information.