NAG FL Interface
e05jlf (bnd_​mcs_​optget_​real)

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1 Purpose

e05jlf is used to get the value of a real e05jbf optional parameter. e05jlf can be used before or after calling e05jbf, but the initialization routine e05jaf must have been called before calling e05jlf.

2 Specification

Fortran Interface
Subroutine e05jlf ( optstr, rvalue, comm, lcomm, ifail)
Integer, Intent (In) :: lcomm
Integer, Intent (Inout) :: ifail
Real (Kind=nag_wp), Intent (In) :: comm(lcomm)
Real (Kind=nag_wp), Intent (Out) :: rvalue
Character (*), Intent (In) :: optstr
C Header Interface
#include <nag.h>
void  e05jlf_ (const char *optstr, double *rvalue, const double comm[], const Integer *lcomm, Integer *ifail, const Charlen length_optstr)
The routine may be called by the names e05jlf or nagf_glopt_bnd_mcs_optget_real.

3 Description

e05jlf obtains the current value of a real-valued optional parameter. For example
Call e05jlf ('Local Searches Tolerance', loctol, comm, lcomm, ifail)
will result in the value of the optional parameter Local Searches Tolerance being output in LOCTOL.
A complete list of optional parameters, their symbolic names and default values is given in Section 12 in e05jbf.

4 References


5 Arguments

1: optstr Character(*) Input
On entry: a string identifying a real-valued optional parameter (as described in Section 12 in e05jbf).
2: rvalue Real (Kind=nag_wp) Output
On exit: if ifail=0 on exit, rvalue contains the real 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 e05jlf is called.
Constraint: lcomm100.
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:
Initialization routine e05jaf has not been called.
On entry, lcomm=value.
Constraint: lcomm100.
The supplied optional parameter is invalid. A keyword or keyword combination was not recognized.
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.
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.
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

e05jlf is not threaded in any implementation.

9 Further Comments


10 Example

See e05jcf.