[petsc-users] Changing a few entries in a matrix

[Jed Brown]

Ganesh Vijayakumar <ganesh.iitm at gmail.com> writes:

> Hello,
>
>   I have a CFD application where some entries of the matrix change every
> time step. 

The entries change value or the set of nonzero entries changes?  If the
former, just MatSetValues and carry on.  If the latter, either allocate
for the union of all possible nonzeros (storing some explicit zeros) or
reallocate the matrix each time.

> However, the total number of non-zero elements never changes. Is there
> anyway I can efficiently do this. My current attempts at doing this
> results in running over the total initial memory allocation very soon.
>
> ganesh
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