[dune-fem] dgf grid file parameters option

[Agnese, Marco]

Ciao Francesco,


from the documentation:


       In addition to the element and vertex information it is possible to add
       a set of parameters through the DGF file. Using the construction
       mechanism via the Dune::GridPtr<GridType> class these parameters can be
       accessed using the
       Dune::GridPtr<GridType>::parameters(const Entity& en)
       method. Depending on the codimentsion of \c en the method returns either
       the element or vertex parameters of that entity in the DGF file.
       The number of parameters for a given
       codimension can be retrived using the method
       Dune::GridPtr<GridType>::nofParameters.
       In the case of parallel runs only the process with rank zero reads the
       dgf file and thus the parameters are only available on that processor.
       Do not call loadBalance (or for that matter globalRefine, adapt) on the
       grid instance before retrieving the parameters. To simplify the handling
       of parameters in a parallel run the Dune::GridPtr<GridType>::loadBalance
       method can be used to distribute the macro grid and the parameters.
       Afterwards the parameters can be extracted on each processor using the
       method GridPtr<GridType>::parameters.


Moreover, I would suggest you to use a more recent  version of dune-fem-howto (look here https://gitlab.dune-project.org/dune-fem/dune-fem-howto) which is compatible with the current stable release of dune-fem (v. 2.4.1) and with the unstable dune-fem ( v. 3.0.0).

Cheers,
Marco
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