Hi all,
I need to manually create a PETSc sparsity matrix (not the system matrix)
in parallel computing for other purposes. I only know the number of nonzero
values per row before I initialize the sparsity matrix. Thus I use the
following codes to initialize the PETSc sparsity matrix and add entries to
this matrix:
SparsityPattern sparsity_pattern;
sparsity_pattern.reinit(dof_handler_DG.n_dofs(), dof_handler_DG.n_dofs(),
n_nonzero_per_row);
sparsity_pattern.compress();
filter_matrix.reinit( locally_owned_dofs_DG,
locally_owned_dofs_DG,
sparsity_pattern,
mpi_communicator);
...
filter_matrix.add(current_dof_index, col_indices, weights);
Then I got the following errors:
*[0]PETSC ERROR: Argument out of range[0]PETSC ERROR: Inserting a new
nonzero at global row/column (0, 1) into matrix*
I guess it may be caused by the improperly settings of the sparsity
pattern. How can I correct these errors, and should I use dynamic sparsity
pattern or just the SparsityPattern? Any help will be appreciated.
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