[petsc-users] DMCreateGlobalVector and DMGetGlobalVector

[bichinhoverde]

Hi. I have some questions.

What is the difference between DMCreateGlobalVector and DMGetGlobalVector
(and the local counterparts)?

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);

Thank you.
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