NAG Library Function Document

nag_glopt_opt_get (e05zlc)

1  Purpose

2  Specification

3  Description

4  References

5  Arguments

1:    $\mathbf{optstr}$ – const char *Input

On entry: a string identifying the option whose current value is required. See Section 12 in nag_glopt_bnd_pso (e05sac), nag_glopt_nlp_pso (e05sbc) and nag_glopt_nlp_multistart_sqp (e05ucc) for information on valid options. In addition, the following is a valid option:

$\mathbf{Identify}$

nag_glopt_opt_get (e05zlc) returns in cvalue the function name supplied to nag_glopt_opt_set (e05zkc) when the optional argument arrays iopts and opts were initialized.

2:    $\mathbf{ivalue}$ – Integer *Output

On exit: if the optional argument supplied in optstr is an integer valued argument, ivalue will hold its current value.

3:    $\mathbf{rvalue}$ – double *Output

On exit: if the optional argument supplied in optstr is a real valued argument, rvalue will hold its current value.

4:    $\mathbf{cvalue}$ – char *Output

Note: the string returned in cvalue will never exceed $\min \left(\mathbf{lcvalue},41\right)$ characters in length (including the null terminator).

On exit: if the optional argument supplied in optstr is a character valued argument, cvalue will hold its current value. cvalue will also contain additional information for some integer and real valued arguments, as indicated by optype.

5:    $\mathbf{lcvalue}$ – IntegerInput

On entry: length of cvalue. At most $\mathbf{lcvalue}-1$ non-null characters will be written into cvalue.

Constraint: $\mathbf{lcvalue}>1$.

6:    $\mathbf{optype}$ – Nag_VariableType *Output

On exit: indicates whether the optional argument supplied in optstr is an integer, real or character valued argument and hence which of ivalue, rvalue or cvalue holds the current value.

$\mathbf{optype}=\mathrm{Nag\_Integer}$

optstr is an integer valued optional argument, its current value has been returned in ivalue.

$\mathbf{optype}=\mathrm{Nag\_Real}$

optstr is a real valued optional argument, its current value has been returned in rvalue.

$\mathbf{optype}=\mathrm{Nag\_Character}$

optstr is a character valued optional argument, its current value has been returned in cvalue.

$\mathbf{optype}=\mathrm{Nag\_Integer\_Additional}$

optstr is an integer valued optional argument, its current value has been returned in ivalue. Additional information has been returned in cvalue.

$\mathbf{optype}=\mathrm{Nag\_Real\_Additional}$

optstr is a real valued optional argument, its current value has been returned in rvalue. Additional information has been returned in cvalue.

7:    $\mathbf{iopts}\left[\mathit{dim}\right]$ – const IntegerCommunication Array

Note: the dimension, $\mathit{dim}$, of this array is dictated by the requirements of associated functions that must have been previously called. This array MUST be the same array passed as argument iopts in the previous call to nag_glopt_opt_set (e05zkc).

8:    $\mathbf{opts}\left[\mathit{dim}\right]$ – const doubleCommunication Array

Note: the dimension, $\mathit{dim}$, of this array is dictated by the requirements of associated functions that must have been previously called. This array MUST be the same array passed as argument opts in the previous call to nag_glopt_opt_set (e05zkc).

9:    $\mathbf{fail}$ – NagError *Input/Output

The NAG error argument (see Section 3.6 in the Essential Introduction).

6  Error Indicators and Warnings

NE_ALLOC_FAIL

Dynamic memory allocation failed.
See Section 3.2.1.2 in the Essential Introduction for further information.

NE_BAD_PARAM

On entry, argument $〈\mathit{\text{value}}〉$ had an illegal value.

NE_INT

On entry, $\mathbf{lcvalue}=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{lcvalue}>1$.

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.

An unexpected error has been triggered by this function. Please contact NAG.
See Section 3.6.6 in the Essential Introduction for further information.

NE_INVALID_OPTION

On entry, the option in optstr has not been recognized.

The arrays iopts and opts have either not been initialized, have become corrupted, or are not compatible with this option setting function.

NE_NO_LICENCE

Your licence key may have expired or may not have been installed correctly.
See Section 3.6.5 in the Essential Introduction for further information.

NW_TRUNCATED

On entry, optstr indicates a character optional argument, but cvalue is too short to hold the stored value. The returned value will be truncated.

7  Accuracy

8  Parallelism and Performance

9  Further Comments

10  Example