# Re: [deal.II] Solution Components of a Vector valued problem

```Hello,
Thanks for both replies.
If I define  FESystem<dim> fe (FE_Q<dim>(2), dim, FE_Q<dim>(1), 1); in a
mesh with 10 nodes can I say that:```
```
S[0] = u_x of node A
S[1] = u_y of node A
S[20] = T of node A

S[2] = u_x of node B
S[3] = u_y of node B
S[21] = T of node B

Generally I would like to find the corresponding U_x, u_y and T of a
specific node.

Thanks.
Lisa

On Thursday, October 13, 2016 at 10:32:20 PM UTC+2, Wolfgang Bangerth wrote:
>
> On 10/13/2016 05:05 AM, Lisa Collins wrote:
> >
> > Dealing with vector valued problems in deal ii is a bit confusing for
> me.
> > I have a question regarding the solution vector (S).
> > If we have a problem with 20 nodes and 3 dofs per node (u_x , u_y , and
> T
> > temperature) can we always say that:
> >
> > S[0] = u_x of node A
> > S[1] = u_y of node A
> > S[2] = T of node A
> >
> > S[3] = u_x of node B
> > S[4] = u_y of node B
> > S[5] = T of node B
>
> In general, the answer is no. As Bruno pointed out, you can *enforce* that
> in
> some circumstances, but you should not make this assumption unless you
> have
> *explicitly* made sure that things are as you describe.
>
> Best
>   W.
>
> --
> ------------------------------------------------------------------------
> Wolfgang Bangerth          email:                 bang...@colostate.edu
> <javascript:>
>                             www: http://www.math.colostate.edu/~bangerth/
>
>

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