NAG Library Routine Document

E04WBF

1  Purpose

2  Specification

3  Description

4  References

5  Parameters

1:     RNAME – CHARACTER(*)Input

On entry: the name of the routine to be initialized.

Constraint: RNAME must be the name of one of the routines initialized by E04WBF.

2:     CWSAV(LCWSAV) – CHARACTER(80) arrayCommunication Array

3:     LCWSAV – INTEGERInput

On entry: the dimension of the array CWSAV as declared in the (sub)program from which E04WBF is called.

Constraints:

• if $\mathbf{RNAME}=\text{'E04UFF'}$ or $\text{'E04UFA'}$, $\mathbf{LCWSAV}\ge 5$;
• otherwise $\mathbf{LCWSAV}\ge 1$.

4:     LWSAV(LLWSAV) – LOGICAL arrayCommunication Array

5:     LLWSAV – INTEGERInput

On entry: the dimension of the array LWSAV as declared in the (sub)program from which E04WBF is called.

Constraints:

• if $\mathbf{RNAME}=\text{'E04NKF'}$ or $\text{'E04NKA'}$, $\mathbf{LLWSAV}\ge 20$;
• if $\mathbf{RNAME}=\text{'E04UGF'}$ or $\text{'E04UGA'}$, $\mathbf{LLWSAV}\ge 20$;
• otherwise $\mathbf{LLWSAV}\ge 120$.

6:     IWSAV(LIWSAV) – INTEGER arrayCommunication Array

7:     LIWSAV – INTEGERInput

On entry: the dimension of the array IWSAV as declared in the (sub)program from which E04WBF is called.

Constraints:

• if $\mathbf{RNAME}=\text{'E04NKF'}$ or $\text{'E04NKA'}$, $\mathbf{LIWSAV}\ge 380$;
• if $\mathbf{RNAME}=\text{'E04UGF'}$ or $\text{'E04UGA'}$, $\mathbf{LIWSAV}\ge 550$;
• otherwise $\mathbf{LIWSAV}\ge 610$.

8:     RWSAV(LRWSAV) – REAL (KIND=nag_wp) arrayCommunication Array

9:     LRWSAV – INTEGERInput

On entry: the dimension of the array RWSAV as declared in the (sub)program from which E04WBF is called.

Constraints:

• if $\mathbf{RNAME}=\text{'E04NKF'}$ or $\text{'E04NKA'}$, $\mathbf{LRWSAV}\ge 285$;
• if $\mathbf{RNAME}=\text{'E04UGF'}$ or $\text{'E04UGA'}$, $\mathbf{LRWSAV}\ge 550$;
• otherwise $\mathbf{LRWSAV}\ge 475$.

10:   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

$\mathbf{IFAIL}=1$

The routine name supplied in RNAME is invalid

$\mathbf{IFAIL}=2$

One or more of the workspace array lengths LCWSAV, LLWSAV, LIWSAV or LRWSAV is too small.

7  Accuracy

8  Further Comments

9  Example