Certainly missing Jacobian entries can dramatically change the Newton
direction and hence the convergence. Even if the optimal (in time) setup skips
some Jacobian entries it is always good to have runs with all the entries to
see the "best possible" convergence.
Barry
> On May 19, 2024,
Great, it sounds like this might be easier than I expected. Thanks very
much.
Did you have any thoughts on my diagnosis of the problem (the poor
nonlinear solver convergence being caused by missing Jacobian elements
representing interaction between the sources)?
- Adrian
On 20/05/24 12:41 p
On Sun, May 19, 2024 at 8:25 PM Barry Smith wrote:
> You can call MatSetOption(mat,MAT_NEW_NONZERO_LOCATION_ERR) then insert
> the new values. If it is just a handful of new insertions the extra time
> should be small. Making a copy of the matrix won't give you a new matrix
> that is any faster t
You can call MatSetOption(mat,MAT_NEW_NONZERO_LOCATION_ERR) then insert the
new values. If it is just a handful of new insertions the extra time should be
small.
Making a copy of the matrix won't give you a new matrix that is any faster
to insert into so best to just use the same matrix
hi, I have a Jacobian matrix created using DMCreateMatrix(). What would be the best way to add extra nonzero entries into it? I'm guessing that DMCreateMatrix() allocates the storage so the nonzero structure can't really be easily modified.
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Thi
