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[Kristian B. Ølgaard <question158012@xxxxxxxxxxxxxxxxxxxxx>]

Question #158012 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/158012

    Status: Open => Answered

Kristian B. Ølgaard proposed the following answer:
On 19 May 2011 14:15, Kyle <question158012@xxxxxxxxxxxxxxxxxxxxx> wrote:
> Question #158012 on DOLFIN changed:
> https://answers.launchpad.net/dolfin/+question/158012
>
>    Status: Answered => Open
>
> Kyle is still having a problem:
> Hi Johan,
>
> Thanks this helped me a bit, so now I have
>
> solver.solve(problem,s.vector())
> (U, P) = s.split(deepcopy=True)
>
> values = P.vector()
>
> This is working fine it seems, but I am still unsure how to extract
> specific data points from 'values' say from x[0.3 to 0.5] & y[0.0 to
> 0.3] as an example

I think you need to:
  get the dofmap of P,
  loop the cells in the mesh,
    tabulate the dofs on each cell
    tabulate the coordinates of each dof on the cell
    check which dofs satisfy your criterion and then extract the
values from the P vector using the dofs

Kristian

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