[petsc-users] DMDA and vector PDE

[Jed Brown]

On Tue, Nov 1, 2011 at 10:06, Alexander Grayver <agrayver at gfz-potsdam.de>wrote:

> Thanks Jed, looks easy. I've read about this parameter in documentation,
> but it wasn't obvious how to use it.
> May be it's worth to mention it shortly in "2.4.4 Accessing the Vector
> Entries for DMDA Vectors" or somewhere else.
>

I'll add a note. The most common approach is to declare a struct

typedef struct {
    PetscScalar u,v,omega,temp;
} Field;

and then access as x[j][i].omega, etc. An example:

http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/src/snes/examples/tutorials/ex50.c.html
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