Baerbel,

> me and my colleage Thomas we found a problem in the function
> DoFTools::extract_constant_modes(const DH &dof_handler,
> const std::vector<bool> &component_select,
> std::vector<std::vector<bool> > &constant_modes)
>
> We would like to use a system which consists of three blocks, e.g.
> (v,u,p) where v are the velocity components, u dispacement and p
> pressure.
>
> Everything works fine if we select only the velocity components. But it
> doesn't work if we select the displacements only. We would like to fix
> this lack.
>
> Therefore we would like to know what has to be written into the output
> vector constant_modes.

This is a question for Martin, who wrote both this function and the 
Trilinos AMG interface. I think he's traveling till sometime mid-week.

That said, can you explain what exactly is going wrong? A testcase for the 
testsuite that shows the problem would also help!

Best
 W.

-------------------------------------------------------------------------
Wolfgang Bangerth                email:            [email protected]
                                 www: http://www.math.tamu.edu/~bangerth/

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