[petsc-users] Conversion between AIJ & BAIJ

[Jed Brown]

Chung-Kan Huang <ckhuangf at gmail.com> writes:

> Hi,
>
> Does PETSc provide means for conversion between AIJ & BAIJ.

Did you try MatConvert?

> My matrix is created as AIJ because it makes life easy for most part of the
> applications

Why does the assembly code know what format it is assembling?  All the
same MatSetValues should work after MatSetType(A,MATBAIJ).

> but some part of applications actually get some benefits with BAIJ.
> So I wonder if a matrix can exist as two idenfities and I can use
> either format depend on which one is more convenient at run time.

Yes, it's idiomatic to set a prefix and call MatSetFromOptions, then use
-yourprefix_mat_type baij at run-time.
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