NAG FL Interface
e04rxf (handle_​set_​get_​real)

1 Purpose

2 Specification

3 Description

4 References

5 Arguments

1: $\mathbf{handle}$ – Type (c_ptr) Input

On entry: the handle to the problem. It needs to be initialized by e04raf and must not be changed between calls to the NAG optimization modelling suite.

2: $\mathbf{cmdstr}$ – Character(*) Input

On entry: a string which identifies the item within the handle to be read or written. The string is case insensitive and space tolerant.

Constraint: $\mathbf{cmdstr}='\mathrm{Primal\; Variables}','\mathrm{Dual\; Variables}','\mathrm{Dual\; Cone\; Variables}','\mathrm{X}','\mathrm{U}'\text{ or }'\mathrm{UC}'$.

3: $\mathbf{ioflag}$ – Integer Input

On entry: indicates the direction of the communication.

$\mathbf{ioflag}\ne 0$

e04rxf will extract the requested information from the handle to rarr.

$\mathbf{ioflag}=0$

The writing mode will apply and the content of rarr will be copied to the handle.

4: $\mathbf{lrarr}$ – Integer Input/Output

On entry: the dimension of the array rarr.

On exit: the correct expected dimension of rarr if lrarr does not match the item identified by cmdstr (in this case e04rxf returns $\mathbf{ifail}=\mathbf{2}$).

5: $\mathbf{rarr}\left(\mathbf{lrarr}\right)$ – Real (Kind=nag_wp) array Input/Output

On entry: if $\mathbf{ioflag}=0$ (write mode), rarr must contain the information to be written to the handle; otherwise it does not need to be set.

On exit: if $\mathbf{ioflag}\ne 0$ (read mode), rarr contains the information requested by cmdstr; otherwise rarr is unchanged.

6: $\mathbf{ifail}$ – 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 $-1$ is recommended since useful values can be provided in some output arguments even when $\mathbf{ifail}\ne \mathbf{0}$ on exit. When the value $-\mathbf{1}$ or $\mathbf{1}$ is used it is essential to test the value of ifail on exit.

On exit: $\mathbf{ifail}=\mathbf{0}$ unless the routine detects an error or a warning has been flagged (see Section 6).

6 Error Indicators and Warnings

$\mathbf{ifail}=1$

The supplied handle does not define a valid handle to the data structure for the NAG optimization modelling suite. It has not been initialized by e04raf or it has been corrupted.

$\mathbf{ifail}=2$

On entry, $\mathbf{lrarr}=〈\mathit{\text{value}}〉$, expected $\mathrm{value}=〈\mathit{\text{value}}〉$.
Constraint: lrarr must match the size of the data identified in cmdstr.

$\mathbf{ifail}=3$

The provided cmdstr is not recognised.

$\mathbf{ifail}=4$

Reading mode is not supported for the given cmdstr.

$\mathbf{ifail}=5$

Writing mode is not supported for the given cmdstr.

$\mathbf{ifail}=6$

The request cannot be processed at this phase.

The requested information is not available.

$\mathbf{ifail}=7$

The request cannot be processed by the current solver.

$\mathbf{ifail}=-99$

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.

$\mathbf{ifail}=-399$

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.

$\mathbf{ifail}=-999$

Dynamic memory allocation failed.

See Section 9 in the Introduction to the NAG Library FL Interface for further information.

7 Accuracy

8 Parallelism and Performance

9 Further Comments

10 Example

10.1 Program Text

10.2 Program Data

10.3 Program Results