[petsc-users] DMCreateGlobalVector and DMGetGlobalVector

[Jed Brown]

bichinhoverde <bichinhoverde at spwinternet.com.br> writes:

> Hi. I have some questions.
>
> What is the difference between DMCreateGlobalVector and DMGetGlobalVector
> (and the local counterparts)?

Create creates a vector that the caller owns.  Get merely gets access to
a vector from a managed pool (creating it if necessary), to be returned
via DMRestoreGlobalVector().

> What happens when one calls SNESSolve with NULL for the solution vector, as
> in src/snes/examples/tutorials/ex7.c:158? SNESSolve(snes,NULL,NULL);

A vector is created automatically.  You can get access to it with
SNESGetSolution.
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