# Assembler¶

class dolfin.cpp.fem.Assembler

This class provides automated assembly of linear systems, or more generally, assembly of a sparse tensor from a given variational form.

Subdomains for cells and facets may be specified by assigning subdomain indicators specified by MeshFunction to the Form being assembled:

form.dx = cell_domains
form.ds = exterior_facet_domains
form.dS = interior_facet_domains


Constructor

assemble()

Assemble tensor from given form

Arguments
A (GenericTensor)
The tensor to assemble.
a (Form)
The form to assemble the tensor from.
assemble_cells()

Assemble tensor from given form over cells. This function is provided for users who wish to build a customized assembler.

assemble_exterior_facets()

Assemble tensor from given form over exterior facets. This function is provided for users who wish to build a customized assembler.

assemble_interior_facets()

Assemble tensor from given form over interior facets. This function is provided for users who wish to build a customized assembler.

assemble_vertices()

Assemble tensor from given form over vertices. This function is provided for users who wish to build a customized assembler.

thisown

The membership flag