NAG CL Interface
e04znc (handle_​opt_​get)

1 Purpose

2 Specification

3 Description

4 References

5 Arguments

1: $\mathbf{handle}$ – void * Input

On entry: the handle to the problem. It needs to be initialized (e.g., by e04rac) and must not be changed between calls to the NAG optimization modelling suite.

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

On entry: a string identifying the optional parameter whose current value is required. See the documentation of the particular solver for information on valid optional parameters.

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

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

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

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

5: $\mathbf{cvalue}$ – char * Output

Note: the string returned in cvalue will never exceed $\min (\mathbf{lcvalue},41)$ characters in length, including the terminating NULL character.

On exit: if the optional parameter supplied in optstr is a character-valued parameter, cvalue will hold its current value.

6: $\mathbf{lcvalue}$ – Integer Input

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

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

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

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

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

optstr is an integer-valued optional parameter; its current value has been returned in ivalue.

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

optstr is a real-valued optional parameter; its current value has been returned in rvalue.

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

optstr is a character-valued optional parameter; its current value has been returned in cvalue.

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

The NAG error argument (see Section 7 in the Introduction to the NAG Library CL Interface).

6 Error Indicators and Warnings

NE_ALLOC_FAIL

Dynamic memory allocation failed.
See Section 3.1.2 in the Introduction to the NAG Library CL Interface for further information.

NE_BAD_PARAM

On entry, argument $⟨\mathit{\text{value}}⟩$ had an illegal value.

NE_HANDLE

The supplied handle does not define a valid handle to the data structure for the NAG optimization modelling suite. It has not been properly initialized or it has been corrupted.

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.
See Section 7.5 in the Introduction to the NAG Library CL Interface for further information.

NE_INVALID_OPTION

On entry, the $\mathit{option}$ supplied in optstr was not recognized: $\mathbf{optstr}=⟨\mathit{\text{value}}⟩$.

NE_NO_LICENCE

Your licence key may have expired or may not have been installed correctly.
See Section 8 in the Introduction to the NAG Library CL Interface for further information.

NW_TRUNCATED

On entry, optstr indicates a character optional parameter, 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