NAG FL Interface
g02zlf (optget)

1 Purpose

2 Specification

3 Description

4 References

5 Arguments

1: $\mathbf{optstr}$ – Character(*) Input

On entry: a string identifying the option whose current value is required. See Section 12 in g02qgf for information on valid options. In addition, the following is a valid option:

$\mathbf{Identify}$

g02zlf returns in cvalue the (upper-cased) routine name supplied to g02zkf when the optional parameter arrays iopts and opts were initialized.

2: $\mathbf{ivalue}$ – Integer Output

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

3: $\mathbf{rvalue}$ – Real (Kind=nag_wp) Output

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

4: $\mathbf{cvalue}$ – Character(*) Output

Note: the string returned in cvalue will never exceed $40$ characters in length.

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

5: $\mathbf{optype}$ – Integer 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.

$\mathbf{optype}=1$

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

$\mathbf{optype}=2$

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

$\mathbf{optype}=3$

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

6: $\mathbf{iopts}\left(*\right)$ – Integer array Communication Array

Note: the dimension 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 g02zkf.

7: $\mathbf{opts}\left(*\right)$ – Real (Kind=nag_wp) array Communication Array

Note: the dimension 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 g02zkf.

8: $\mathbf{ifail}$ – 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 $0$ is recommended. 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

$\mathbf{ifail}=11$

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

$\mathbf{ifail}=41$

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

$\mathbf{ifail}=61$

On entry, either the option arrays have not been initialized or they have been corrupted.

$\mathbf{ifail}=-99$

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