NAG Library Routine Document

e04wbf  (init)

1

Purpose

2

Specification

3

Description

4

References

5

Arguments

1:     $\mathbf{rname}$ – Character(*)Input

On entry: the name of the routine to be initialized. The name may be abbreviated to the first 5 letters of the ‘short’ name, or by omitting the nagf_ or opt_ prefixes of the ‘long’ name.

Constraint: rname must be the name of one of the routines initialized by e04wbf.

2:     $\mathbf{cwsav}\left(\mathbf{lcwsav}\right)$ – Character(80) arrayCommunication Array

3:     $\mathbf{lcwsav}$ – IntegerInput

On entry: the dimension of the array cwsav as declared in the (sub)program from which e04wbf is called.

Constraints:

• if $\mathbf{rname}=\text{'e04uf'}$ or $\text{'nlp1\_rcomm'}$, $\mathbf{lcwsav}\ge 5$;
• otherwise $\mathbf{lcwsav}\ge 1$.

4:     $\mathbf{lwsav}\left(\mathbf{llwsav}\right)$ – Logical arrayCommunication Array

5:     $\mathbf{llwsav}$ – IntegerInput

On entry: the dimension of the array lwsav as declared in the (sub)program from which e04wbf is called.

Constraints:

• if $\mathbf{rname}=\text{'e04nk'}$ or $\text{'qpconvex1\_sparse\_solve'}$, $\mathbf{llwsav}\ge 20$;
• if $\mathbf{rname}=\text{'e04ug'}$ or $\text{'nlp1\_sparse\_solve'}$, $\mathbf{llwsav}\ge 20$;
• otherwise $\mathbf{llwsav}\ge 120$.

6:     $\mathbf{iwsav}\left(\mathbf{liwsav}\right)$ – Integer arrayCommunication Array

7:     $\mathbf{liwsav}$ – IntegerInput

On entry: the dimension of the array iwsav as declared in the (sub)program from which e04wbf is called.

Constraints:

• if $\mathbf{rname}=\text{'e04nk'}$ or $\text{'qpconvex1\_sparse\_solve'}$, $\mathbf{liwsav}\ge 380$;
• if $\mathbf{rname}=\text{'e04ug'}$ or $\text{'nlp1\_sparse\_solve'}$, $\mathbf{liwsav}\ge 550$;
• otherwise $\mathbf{liwsav}\ge 610$.

8:     $\mathbf{rwsav}\left(\mathbf{lrwsav}\right)$ – Real (Kind=nag_wp) arrayCommunication Array

9:     $\mathbf{lrwsav}$ – IntegerInput

On entry: the dimension of the array rwsav as declared in the (sub)program from which e04wbf is called.

Constraints:

• if $\mathbf{rname}=\text{'e04nk'}$ or $\text{'qpconvex1\_sparse\_solve'}$, $\mathbf{lrwsav}\ge 285$;
• if $\mathbf{rname}=\text{'e04ug'}$ or $\text{'nlp1\_sparse\_solve'}$, $\mathbf{lrwsav}\ge 550$;
• otherwise $\mathbf{lrwsav}\ge 475$.

10:   $\mathbf{ifail}$ – IntegerInput/Output

On entry: ifail must be set to $0$, $-1\text{ or }1$. If you are unfamiliar with this argument you should refer to Section 3.4 in How to Use the NAG Library and its Documentation 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 argument, 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.

$\mathbf{ifail}=-99$

An unexpected error has been triggered by this routine. Please contact NAG.

See Section 3.9 in How to Use the NAG Library and its Documentation for further information.

$\mathbf{ifail}=-399$

Your licence key may have expired or may not have been installed correctly.

See Section 3.8 in How to Use the NAG Library and its Documentation for further information.

$\mathbf{ifail}=-999$

Dynamic memory allocation failed.

See Section 3.7 in How to Use the NAG Library and its Documentation for further information.

7

Accuracy

8

Parallelism and Performance

9

Further Comments

10

Example