NAG Library Routine Document

E05JGF

1  Purpose

2  Specification

3  Description

LOCTOL = 1.0E-10
CALL E05JGF ('Local Searches Tolerance', LOCTOL, COMM, LCOMM, IFAIL)

4  References

5  Parameters

1:     OPTSTR – CHARACTER(*)Input

On entry: a string identifying a real-valued optional parameter (as described in Section 11 in E05JBF).

2:     RVALUE – REAL (KIND=nag_wp)Input

On entry: the value associated with the optional parameter in OPTSTR.

3:     COMM(LCOMM) – REAL (KIND=nag_wp) arrayCommunication Array

On exit: COMM must not be altered between calls to any of the routines E05JBF, E05JCF, E05JDF, E05JEF, E05JFF, E05JGF, E05JHF, E05JJF, E05JKF and E05JLF.

4:     LCOMM – INTEGERInput

On entry: the dimension of the array COMM as declared in the (sub)program from which E05JGF is called.

Constraint: $\mathbf{LCOMM}\ge 100$.

5:     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

$\mathbf{IFAIL}=1$

On entry,	$\mathbf{LCOMM}<100$,
or	the initialization routine E05JAF has not been called.

$\mathbf{IFAIL}=2$

The optional parameter given in OPTSTR is invalid. A keyword or keyword combination was not recognized.

$\mathbf{IFAIL}=3$

The option value to be set is out of range with respect to the optional parameter given in OPTSTR. See Section 11 in E05JBF for allowable values of the optional parameters.

7  Accuracy

8  Further Comments

9  Example