Hey all,

I have a FESystem (Q_y,Q_u) and I am assembling a matrix [K_y
N_yu;N_uy M_u] but I also need a mass matrix M_y.
For this I thought that I could simply call something like
       MatrixCreator::create_mass_matrix(dof_handler,...,mass_matrix)
by specifying the dof_handler only for the y-components. Is there
anyway that this is possible by only accessing the y_components of the
dof_handler?

Any help is most welcome.

Thanks,
Martin
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