Dear Marco,
Yes, your code is correct and it should work correctly.
Note that you can also use the high level generic assembly with the
model object using a generic assembly brick.
Note also that high level assembly is only available in the svn
repository version of Getfem
(and a very recent version, at least r4570 because a bug have been
corrected on coupled problems recently).
Yves.
Le 31/03/2014 14:00, Marco Pischedda a écrit :
> Dear all,
>
> I want to use the high level generic assembly procedures in order to
> use the automatic differentation for calculating the Jacobian of a
> non-linear problem.
>
> For example I want to calculate the Jacobian of two vectorial
> equations in the unknowns "u" and "p". The first vectorial equation is
> (u+p).Test_u while the second is (u+p).Test_p.
>
> It is correct the following code?
>
> gmm::sub_interval Iu(0, ndofs_u);
> gmm::sub_interval Ip(ndofs_u,ndofs_p);
> workspace.add_fem_variable("u", mf_u, Iu, U);
> workspace.add_fem_variable("p", mf_p, Ip, P);
> workspace.add_expression("(u+p).Test_u + (u+p).Test_p",mim);
> getfem::model_real_sparse_matrix Jac(ndofs_u+ndofs_p, ndofs_u+ndofs_p);
> workspace.set_assembled_matrix(Jac);
> workspace.assembly(2);
>
> In the matrix Jac I have the Jacobian of the system?
>
>
> Thanks in advance
>
> Marco
>
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--
Yves Renard ([email protected]) tel : (33) 04.72.43.87.08
Pole de Mathematiques, INSA-Lyon fax : (33) 04.72.43.85.29
20, rue Albert Einstein
69621 Villeurbanne Cedex, FRANCE
http://math.univ-lyon1.fr/~renard
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