NAG FL Interface
d01zlf (opt_​get)

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 11 in d01esf and d01raf for information on valid optional parameters. In addition, the following is a valid option:

$\mathbf{Identify}$

In which case d01zlf returns in cvalue the $6$ character routine name supplied to d01zkf 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 that 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 that 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 that value. cvalue will also contain additional information for some integer and real valued parameters, as indicated by optype.

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.

$\mathbf{optype}=4$

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

$\mathbf{optype}=5$

optstr is a real valued optional parameter; its current value has been returned in rvalue. Additional information 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 d01zkf.

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 d01zkf.

8: $\mathbf{ifail}$ – Integer Input/Output

On entry: ifail must be set to $0$, $\mathrm{-1}$ 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 $\mathrm{-1}$ means that an error message is printed while a value of $1$ means that it is not.

If halting is not appropriate, the value $\mathrm{-1}$ 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 optional parameter 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.

$\mathbf{ifail}=61$

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

$\mathbf{ifail}=-99$

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