NAG FL Interface
e04wbf (nlp1_​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) array Communication Array

3: $\mathbf{lcwsav}$ – Integer Input

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 array Communication Array

5: $\mathbf{llwsav}$ – Integer Input

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 array Communication Array

7: $\mathbf{liwsav}$ – Integer Input

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) array Communication Array

9: $\mathbf{lrwsav}$ – Integer Input

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: $\mathbf{ifail}$ – Integer Input/Output

On entry: ifail must be set to $0$, $\mathrm{-1}$ or $1$ to set behaviour on detection of an error; these values have no effect when no error is detected.

A value of $0$ causes the printing of an error message and program execution will be halted; otherwise program execution continues. A value of $\mathrm{-1}$ means that an error message is printed while a value of $1$ means that it is not.

If halting is not appropriate, the value $\mathrm{-1}$ or $1$ is recommended. If message printing is undesirable, then the value $1$ is recommended. Otherwise, the value $0$ is recommended. When the value $-\mathbf{1}$ 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, $\mathbf{rname}=⟨\mathit{\text{value}}⟩$ was not a valid routine name.

$\mathbf{ifail}=2$

One or more of the save array lengths is too small. Supplied values are: $\mathbf{lcwsav}=⟨\mathit{\text{value}}⟩$, $\mathbf{llwsav}=⟨\mathit{\text{value}}⟩$, $\mathbf{liwsav}=⟨\mathit{\text{value}}⟩$ and $\mathbf{lrwsav}=⟨\mathit{\text{value}}⟩$.

$\mathbf{ifail}=-99$

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

See Section 7 in the Introduction to the NAG Library FL Interface for further information.

$\mathbf{ifail}=-399$

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

See Section 8 in the Introduction to the NAG Library FL Interface for further information.

$\mathbf{ifail}=-999$

Dynamic memory allocation failed.

See Section 9 in the Introduction to the NAG Library FL Interface for further information.

7 Accuracy

8 Parallelism and Performance

9 Further Comments

10 Example