NAG Library Function Document

nag_dae_ivp_dassl_linalg (d02npc)

1  Purpose

2  Specification

3  Description

4  References

5  Arguments

1:    $\mathbf{neq}$ – IntegerInput

On entry: the number of differential-algebraic equations to be solved.

Constraint: $1\le \mathbf{neq}$.

2:    $\mathbf{ml}$ – IntegerInput

On entry: $ml$, the number of subdiagonals in the band.

Constraint: $0\le \mathbf{ml}\le \mathbf{neq}-1$.

3:    $\mathbf{mu}$ – IntegerInput

On entry: $mu$, the number of superdiagonals in the band.

Constraint: $0\le \mathbf{mu}\le \mathbf{neq}-1$.

4:    $\mathbf{icom}\left[\mathbf{licom}\right]$ – IntegerCommunication Array

icom is used to communicate details of the integration from nag_dae_ivp_dassl_setup (d02mwc) and details of the banded structure of the Jacobian to nag_dae_ivp_dassl_gen (d02nec).

5:    $\mathbf{licom}$ – IntegerInput

On entry: the dimension of the array icom.

Constraint: $\mathbf{licom}\ge 50+\mathbf{neq}$.

6:    $\mathbf{fail}$ – NagError *Input/Output

The NAG error argument (see Section 3.6 in the Essential Introduction).

6  Error Indicators and Warnings

NE_ALLOC_FAIL

Dynamic memory allocation failed.
See Section 3.2.1.2 in the Essential Introduction for further information.

NE_BAD_PARAM

On entry, argument $〈\mathit{\text{value}}〉$ had an illegal value.

NE_INITIALIZATION

Either the initialization function has not been called prior to the first call of this function or the communication array has become corrupted.

NE_INT

On entry, licom is too small: $\mathbf{licom}=〈\mathit{\text{value}}〉$.

On entry, $\mathbf{ml}=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{ml}\ge 0$.

On entry, $\mathbf{mu}=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{mu}\ge 0$.

On entry, $\mathbf{neq}=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{neq}\ge 1$.

NE_INT_2

On entry, $\mathbf{ml}=〈\mathit{\text{value}}〉$ and $\mathbf{neq}=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{ml}\le \mathbf{neq}-1$.

On entry, $\mathbf{mu}=〈\mathit{\text{value}}〉$ and $\mathbf{neq}=〈\mathit{\text{value}}〉$.
Constraint: $\mathbf{mu}\le \mathbf{neq}-1$.

NE_INTERNAL_ERROR

An internal error has occurred in this function. Check the function call and any array sizes. If the call is correct then please contact NAG for assistance.

An unexpected error has been triggered by this function. Please contact NAG.
See Section 3.6.6 in the Essential Introduction for further information.

NE_NO_LICENCE

Your licence key may have expired or may not have been installed correctly.
See Section 3.6.5 in the Essential Introduction for further information.

7  Accuracy

8  Parallelism and Performance

9  Further Comments

10  Example