Dear Daniel, Let me ask a more specific question. I was wondering how to apply any sort of constraints ( that may be periodic BC or so) in an assembly function like mine in which some manipulations is done on mass_matrix and laplase_matrix. Following some posts in forum I found I can use void ConstraintMatrix::condense (system_matrix, system_rhs) at the end of assembly after all manipulations, but it seems this function works with dealii sparsematrices not trilinos ones.
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