NAG Library Routine Document

G02ZKF

1  Purpose

2  Specification

3  Description

call G02ZKF('Initialize = g02qgf', IOPTS, LIOPTS, OPTS, LOPTS, IFAIL)

4  References

5  Parameters

1:     OPTSTR – CHARACTER(*)Input

On entry: a string identifying the option to be set.

$\mathbf{Initialize}=\mathit{routine\; name}$

Initialize the optional parameter arrays IOPTS and OPTS for use with routine $\mathit{routine\; name}$, where $\mathit{routine\; name}$ is the short name of the problem solving routine you wish to use.

$\mathbf{Defaults}$

Resets all options to their default values.

$\mathbf{Option}=\mathit{optval}$

See Section 11 in G02QGF for details of valid values for option and optval. The equals sign ($=$) delimiter must be used to separate the option from its optval value.

OPTSTR is case insensitive. Each token in the option and optval component must be separated by at least one space.

2:     IOPTS(LIOPTS) – INTEGER arrayCommunication Array

On entry: optional parameter array.

If OPTSTR has the form $\mathbf{Initialize}=\mathit{routine\; name}$, the contents of IOPTS need not be set.

Otherwise, IOPTS must not have been altered since the last call to G02ZKF, G02ZLF or the selected problem solving routine.

On exit: dependent on the contents of OPTSTR, either an initialized, reset or updated version of the optional parameter array.

3:     LIOPTS – INTEGERInput

On entry: the length of the array IOPTS.

Constraint: unless otherwise stated in the documentation for a specific, supported, problem solving routine, $\mathbf{LIOPTS}\ge 100$.

4:     OPTS(LOPTS) – REAL (KIND=nag_wp) arrayCommunication Array

On entry: optional parameter array.

If OPTSTR has the form $\mathbf{Initialize}=\mathit{routine\; name}$, the contents of OPTS need not be set.

Otherwise, OPTS must not have been altered since the last call to G02ZKF, G02ZLF or the selected problem solving routine.

On exit: dependent on the contents of OPTSTR, either an initialized, reset or updated version of the optional parameter array.

5:     LOPTS – INTEGERInput

On entry: the length of the array OPTS.

Constraint: Unless otherwise stated in the documentation for a specific, supported, problem solving routine, $\mathbf{LOPTS}\ge 100$.

6:     IFAIL – INTEGERInput/Output

On entry: IFAIL must be set to $0$, $-1\text{ or }1$. If you are unfamiliar with this parameter you should refer to Section 3.3 in the Essential Introduction for details.

For environments where it might be inappropriate to halt program execution when an error is detected, the value $-1\text{ or }1$ is recommended. If the output of error messages is undesirable, then the value $1$ is recommended. Otherwise, if you are not familiar with this parameter, the recommended value is $0$. When the value $-\mathbf{1}\text{ or }\mathbf{1}$ 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 supplied in OPTSTR was not recognized.

$\mathbf{IFAIL}=12$

On entry, the expected delimiter ($=$) was not found in OPTSTR.

$\mathbf{IFAIL}=13$

On entry, the optval contained in OPTSTR could not be converted into a numeric value.

$\mathbf{IFAIL}=14$

On entry, the option Initialize was identified, however the associated optval was not a supported routine name.

$\mathbf{IFAIL}=15$

On entry, the integer optval associated with the optional parameter is not valid.

$\mathbf{IFAIL}=16$

On entry, the real optval associated with the optional parameter is not valid.

$\mathbf{IFAIL}=17$

On entry, the character optval associated with the optional parameter is not valid.

$\mathbf{IFAIL}=21$

On entry, the optional parameter arrays IOPTS and OPTS have not been initialized, or have been corrupted.

$\mathbf{IFAIL}=31$

On entry, LIOPTS is too small.

$\mathbf{IFAIL}=51$

On entry, LOPTS is too small.

7  Accuracy

8  Further Comments

9  Example