NAG C Library Function Document

nag_glopt_bnd_mcs_optset_real (e05jgc) may be used to supply individual real optional parameters to nag_glopt_bnd_mcs_solve (e05jbc). The initialization function nag_glopt_bnd_mcs_init (e05jac) must have been called before calling nag_glopt_bnd_mcs_optset_real (e05jgc).

2

Specification

#include <nag.h>

#include <nage05.h>

void	nag_glopt_bnd_mcs_optset_real (const char optstr, double rvalue, Nag_E05State state, NagError *fail)

3

Description

nag_glopt_bnd_mcs_optset_real (e05jgc) may be used to supply values for real optional parameters to nag_glopt_bnd_mcs_solve (e05jbc). It is only necessary to call nag_glopt_bnd_mcs_optset_real (e05jgc) for those arguments whose values are to be different from their default values. One call to nag_glopt_bnd_mcs_optset_real (e05jgc) sets one argument value.

Each real optional parameter is defined by a single character string in optstr and the corresponding value in rvalue. For example the following illustrates how the local searches tolerance could be defined:

loctol = 1.0e-10;
e05jgc ('Local Searches Tolerance', loctol, &state, &fail);

A complete list of optional parameters, their symbolic names and default values is given in Section 12 in nag_glopt_bnd_mcs_solve (e05jbc).

4

References

None.

5

Arguments

1: $optstr$ – const char *Input: On entry: a string identifying a real-valued optional parameter (as described in Section 12 in nag_glopt_bnd_mcs_solve (e05jbc)).
2: $rvalue$ – doubleInput: On entry: the value associated with the optional parameter in optstr.
3: $state$ – Nag_E05State *Communication Structure: state contains information required by other functions in this suite. You must not modify it directly in any way.
4: $fail$ – NagError *Input/Output: The NAG error argument (see Section 3.7 in How to Use the NAG Library and its Documentation).

6

Error Indicators and Warnings

NE_ALLOC_FAIL: Dynamic memory allocation failed.
See Section 2.3.1.2 in How to Use the NAG Library and its Documentation for further information.
NE_BAD_PARAM: On entry, argument $〈value〉$ had an illegal value.
NE_INTERNAL_ERROR: An internal error has occurred in this function. Check the function call and any array sizes. If the call is correct then please contact NAG for assistance.
See Section 2.7.6 in How to Use the NAG Library and its Documentation for further information.
NE_NO_LICENCE: Your licence key may have expired or may not have been installed correctly.
See Section 2.7.5 in How to Use the NAG Library and its Documentation for further information.
NE_NOT_INIT: Initialization function nag_glopt_bnd_mcs_init (e05jac) has not been called.
NE_OPT_NOT_READ: The supplied optional parameter is invalid. A keyword or keyword combination was not recognized.
NE_OUT_OF_RANGE: Attempt to assign an out-of-bounds value of $Infinite Bound Size$ ( $infbnd$ ): $infbnd = 〈value〉$ .

Attempt to assign too small a value of $Local Searches Tolerance$ ( $loctol$ ): $loctol = 〈value〉$ .

Attempt to assign too small a value of $Target Objective Error$ ( $objerr$ ): $objerr = 〈value〉$ .

Attempt to assign too small a value of $Target Objective Safeguard$ ( $objsfg$ ): $objsfg = 〈value〉$ .

7

Accuracy

Not applicable.

8

Parallelism and Performance

nag_glopt_bnd_mcs_optset_real (e05jgc) is threaded by NAG for parallel execution in multithreaded implementations of the NAG Library.

Please consult the x06 Chapter Introduction for information on how to control and interrogate the OpenMP environment used within this function. Please also consult the Users' Note for your implementation for any additional implementation-specific information.