# NAG Library Function Document

## 1Purpose

nag_glopt_bnd_mcs_optget_real (e05jlc) is used to get the value of a real nag_glopt_bnd_mcs_solve (e05jbc) optional parameter. nag_glopt_bnd_mcs_optget_real (e05jlc) can be used before or after calling nag_glopt_bnd_mcs_solve (e05jbc), but the initialization function nag_glopt_bnd_mcs_init (e05jac) must have been called before calling nag_glopt_bnd_mcs_optget_real (e05jlc).

## 2Specification

 #include #include
 void nag_glopt_bnd_mcs_optget_real (const char *optstr, double *rvalue, Nag_E05State *state, NagError *fail)

## 3Description

nag_glopt_bnd_mcs_optget_real (e05jlc) obtains the current value of a real-valued optional parameter. For example
```e05jlc ('Local Searches Tolerance', &loctol, &state, &fail);
```
will result in the value of the optional parameter ${\mathbf{Local Searches Tolerance}}$ being output in loctol.
A complete list of optional parameters, their symbolic names and default values is given in Section 12 in nag_glopt_bnd_mcs_solve (e05jbc).

None.

## 5Arguments

1:    $\mathbf{optstr}$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:    $\mathbf{rvalue}$double *Output
On exit: if ${\mathbf{fail}}\mathbf{.}\mathbf{code}=$ NE_NOERROR on exit, rvalue contains the real value associated with the optional parameter in optstr.
3:    $\mathbf{state}$Nag_E05State *Communication Structure
state contains information required by other functions in this suite. You must not modify it directly in any way.
4:    $\mathbf{fail}$NagError *Input/Output
The NAG error argument (see Section 3.7 in How to Use the NAG Library and its Documentation).

## 6Error 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.
On entry, argument $〈\mathit{\text{value}}〉$ 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.
The supplied optional parameter is invalid. A keyword or keyword combination was not recognized.

Not applicable.

## 8Parallelism and Performance

nag_glopt_bnd_mcs_optget_real (e05jlc) is not threaded in any implementation.