NAG FL Interface
e04wkf (nlp2_​option_​integer_​get)

1 Purpose

e04wkf is used to get the value of an integer optional parameter. e04wkf can be used before or after calling e04wdf.

2 Specification

Fortran Interface
Subroutine e04wkf ( string, ivalue, iw, rw, ifail)
Integer, Intent (Inout) :: iw(*), ifail
Integer, Intent (Out) :: ivalue
Real (Kind=nag_wp), Intent (Inout) :: rw(*)
Character (*), Intent (In) :: string
C Header Interface
#include <nag.h>
void  e04wkf_ (const char *st, Integer *ivalue, Integer iw[], double rw[], Integer *ifail, const Charlen length_st)
The routine may be called by the names e04wkf or nagf_opt_nlp2_option_integer_get.

3 Description

e04wkf obtains the current value of an integer option. For example
Call e04wkf ('Iterations', itnlim, iw, rw, ifail)
will result in the value of the optional parameter Major Iterations Limit being output in ITNLIM.
A complete list of optional parameters, their abbreviations, synonyms and default values is given in Section 12 in e04wdf.

4 References

None.

5 Arguments

1: string Character(*) Input
On entry: a single valid keyword of an integer optional parameter (as described in Section 12 in e04wdf).
2: ivalue Integer Output
On exit: the integer value associated with the keyword in string.
3: iw* Integer array Communication Array
Note: the actual argument supplied must be the array iw supplied to the initialization routine e04wcf.
4: rw* Real (Kind=nag_wp) array Communication Array
Note: the actual argument supplied must be the array rw supplied to the initialization routine e04wcf.
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 or -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
The initialization routine e04wcf has not been called.
ifail=2
The supplied option string is invalid. Check that the keywords are neither ambiguous nor misspelt. The option string is ‘value’.
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.
ifail=-999
Dynamic memory allocation failed.
See Section 9 in the Introduction to the NAG Library FL Interface for further information.

7 Accuracy

Not applicable.

8 Parallelism and Performance

e04wkf is not threaded in any implementation.

9 Further Comments

None.

10 Example

See Section 10 in e04wef.