From: <pcorreia@ue...>  20070625 19:14:46

Hi, I want to apply system.matrix>add_matrix (my_Ke, rows_vec, cols_vec); to asssemble a dense matrix my_Ke which is built taking in account the basis functions on two adjacent elements (rows_vec for the dofs on element K1 and cols_vec on neighbor element K2). The result I get is: ERROR: LASPACK Error: in ILUFactor for Mat: Factorization produces zero pivot elements. [0] src/numerics/laspack_linear_solver.C, line 274, compiled Jun 15 2007 at 10:36:21 Aborted I suppose this has to do with the sparsity pattern defined by the dof_map object. The question is: how to define a special sparsity pattern which would take in account the degrees of freedom on two neighbor elements. /Paulo 