assemble_system¶
-
dolfin.fem.assembling.
assemble_system
(A_form, b_form, bcs=None, x0=None, form_compiler_parameters=None, add_values=False, finalize_tensor=True, keep_diagonal=False, A_tensor=None, b_tensor=None, backend=None, cell_domains=None, exterior_facet_domains=None, interior_facet_domains=None)¶ Assemble form(s) and apply any given boundary conditions in a symmetric fashion and return tensor(s).
The standard application of boundary conditions does not necessarily preserve the symmetry of the assembled matrix. In order to perserve symmetry in a system of equations with boundary conditions, one may use the alternative assemble_system instead of multiple calls to
assemble
.Examples of usage
For instance, the statements
A = assemble(a) b = assemble(L) bc.apply(A, b)
can alternatively be carried out by
A, b = assemble_system(a, L, bc)
The statement above is valid even if
bc
is a list ofDirichletBC
instances. For more info and options, seeassemble
.