Pai, I found that I forget to add other boundary conditions, and in this case > the stiffness matrix is in fact singular. > From my understanding, if I want to constrain a dof "i" to zero, instead > of adding a constraint of dofs "i, j, k, ...", I may only need the add_line > function. > For my problem, I think more tests need to be excuted to check if the > effect of add_line function is equivalent to that of modifying the > boundary_values directly. > For adding homogeneous constraints it is indeed sufficient to only call add_line. The inhomogeneity is set to zero by default.
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