GenericFunction

class dolfin.cpp.function.GenericFunction(*args, **kwargs)

Bases: dolfin.cpp.function.ufc_function, dolfin.cpp.common.Variable

This is a common base class for functions. Functions can be evaluated at a given point and they can be restricted to a given cell in a finite element mesh. This functionality is implemented by sub-classes that implement the eval and restrict functions. DOLFIN provides two implementations of the GenericFunction interface in the form of the classes Function and Expression . Sub-classes may optionally implement the update function that will be called prior to restriction when running in parallel.

compute_vertex_values()

Compute values at all mesh vertices.

Parameters:

• double > & vertex_values (std::vector<) –
• Mesh & mesh (const) –

Return type:

void

eval()

Evaluate at given point (deprecated)

Parameters:

• double > & values (Array<) –
• Array< double > & x (const) –

Return type:

void

eval_cell()

Evaluate at given point in given cell (deprecated)

Parameters:

• double > & values (Array<) –
• Array< double > & x (const) –
• ufc::cell & cell (const) –

Return type:

void

restrict()

Restrict function to local cell (compute expansion coefficients w)

Parameters:

• * w (double) –
• FiniteElement & element (const) –
• Cell & dolfin_cell (const) –
• double * coordinate_dofs (const) –
• ufc::cell & ufc_cell (const) –

Return type:

void

thisown

The membership flag

update()

Update off-process ghost coefficients.

Return type:void

value_dimension()

Return value dimension for given axis.

Parameters:i (std::size_t) – Return type:std::size_t

value_rank()

Return value rank.

Return type:std::size_t

value_shape()

Return value shape.

Return type:std::vector< std::size_t >

value_size()

Evaluation at given point. Return value size (product of value dimensions)

Return type:std::size_t