NAG Library Routine Document

E05JAF

1  Purpose

2  Specification

3  Description

4  References

5  Parameters

1:     N_R – INTEGERDummy

This parameter is no longer accessed by E05JAF.

2:     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.

3:     LCOMM – INTEGERInput

On entry: the dimension of the array COMM as declared in the (sub)program from which E05JAF is called.

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

4:     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

$\mathbf{IFAIL}=1$

An input parameter is invalid. The output message provides more details of the invalid argument.

7  Accuracy

8  Further Comments

9  Example