utils.h File Reference

Functions supporting finite element method operations. More...

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Namespaces
namespace	dolfinx
	Top-level namespace.
namespace	dolfinx::common
	Miscellaneous classes, functions and types.
namespace	dolfinx::fem
	Finite element method functionality.

Concepts
concept	dolfinx::fem::impl::FetchCells
	Concepts for function that returns cell index.

Functions
template<int num_cells>
std::array< std::int32_t, 2 *num_cells >	get_cell_facet_pairs (std::int32_t f, std::span< const std::int32_t > cells, const graph::AdjacencyList< std::int32_t > &c_to_f)
std::vector< std::int32_t >	compute_integration_domains (IntegralType integral_type, const mesh::Topology &topology, std::span< const std::int32_t > entities, int dim)
	Given an integral type and a set of entities, compute the entities that should be integrated over.
template<dolfinx::scalar T, std::floating_point U>
std::vector< std::vector< std::array< std::shared_ptr< const FunctionSpace< U > >, 2 > > >	extract_function_spaces (const std::vector< std::vector< const Form< T, U > * > > &a)
	Extract test (0) and trial (1) function spaces pairs for each bilinear form for a rectangular array of forms.
template<dolfinx::scalar T, std::floating_point U>
la::SparsityPattern	create_sparsity_pattern (const Form< T, U > &a)
	Create a sparsity pattern for a given form.
template<std::floating_point T>
ElementDofLayout	create_element_dof_layout (const fem::FiniteElement< T > &element, const std::vector< int > &parent_map={})
	Create an ElementDofLayout from a FiniteElement.
DofMap	create_dofmap (MPI_Comm comm, const ElementDofLayout &layout, mesh::Topology &topology, std::function< void(std::span< std::int32_t >, std::uint32_t)> permute_inv, std::function< std::vector< int >(const graph::AdjacencyList< std::int32_t > &)> reorder_fn)
	Create a dof map on mesh.
std::vector< DofMap >	create_dofmaps (MPI_Comm comm, const std::vector< ElementDofLayout > &layouts, mesh::Topology &topology, std::function< void(std::span< std::int32_t >, std::uint32_t)> permute_inv, std::function< std::vector< int >(const graph::AdjacencyList< std::int32_t > &)> reorder_fn)
	Create a set of dofmaps on a given topology.
std::vector< std::string >	get_coefficient_names (const ufcx_form &ufcx_form)
std::vector< std::string >	get_constant_names (const ufcx_form &ufcx_form)
	Get the name of each constant in a UFC form.
template<dolfinx::scalar T, std::floating_point U = scalar_value_type_t<T>>
Form< T, U >	create_form_factory (const ufcx_form &ufcx_form, const std::vector< std::shared_ptr< const FunctionSpace< U > > > &spaces, const std::vector< std::shared_ptr< const Function< T, U > > > &coefficients, const std::vector< std::shared_ptr< const Constant< T > > > &constants, const std::map< IntegralType, std::vector< std::pair< std::int32_t, std::span< const std::int32_t > > > > &subdomains, const std::map< std::shared_ptr< const mesh::Mesh< U > >, std::span< const std::int32_t > > &entity_maps, std::shared_ptr< const mesh::Mesh< U > > mesh=nullptr)
	Create a Form from UFCx input with coefficients and constants passed in the required order.
template<dolfinx::scalar T, std::floating_point U = scalar_value_type_t<T>>
Form< T, U >	create_form (const ufcx_form &ufcx_form, const std::vector< std::shared_ptr< const FunctionSpace< U > > > &spaces, const std::map< std::string, std::shared_ptr< const Function< T, U > > > &coefficients, const std::map< std::string, std::shared_ptr< const Constant< T > > > &constants, const std::map< IntegralType, std::vector< std::pair< std::int32_t, std::span< const std::int32_t > > > > &subdomains, const std::map< std::shared_ptr< const mesh::Mesh< U > >, std::span< const std::int32_t > > &entity_maps, std::shared_ptr< const mesh::Mesh< U > > mesh=nullptr)
	Create a Form from UFC input with coefficients and constants resolved by name.
template<dolfinx::scalar T, std::floating_point U = scalar_value_type_t<T>>
Form< T, U >	create_form (ufcx_form *(*fptr)(), const std::vector< std::shared_ptr< const FunctionSpace< U > > > &spaces, const std::map< std::string, std::shared_ptr< const Function< T, U > > > &coefficients, const std::map< std::string, std::shared_ptr< const Constant< T > > > &constants, const std::map< IntegralType, std::vector< std::pair< std::int32_t, std::span< const std::int32_t > > > > &subdomains, const std::map< std::shared_ptr< const mesh::Mesh< U > >, std::span< const std::int32_t > > &entity_maps, std::shared_ptr< const mesh::Mesh< U > > mesh=nullptr)
	Create a Form using a factory function that returns a pointer to a ufcx_form.
template<std::floating_point T>
FunctionSpace< T >	create_functionspace (std::shared_ptr< mesh::Mesh< T > > mesh, const basix::FiniteElement< T > &e, const std::vector< std::size_t > &value_shape={}, std::function< std::vector< int >(const graph::AdjacencyList< std::int32_t > &)> reorder_fn=nullptr)
	Create a function space from a Basix element.
template<int _bs, dolfinx::scalar T>
void	pack (std::span< T > coeffs, std::int32_t cell, int bs, std::span< const T > v, std::span< const std::uint32_t > cell_info, const DofMap &dofmap, auto transform)
	Pack a single coefficient for a single cell.
template<dolfinx::scalar T, std::floating_point U>
void	pack_coefficient_entity (std::span< T > c, int cstride, const Function< T, U > &u, std::span< const std::uint32_t > cell_info, std::span< const std::int32_t > entities, std::size_t estride, FetchCells auto &&fetch_cells, std::int32_t offset)
	Pack a single coefficient for a set of active entities.
template<dolfinx::scalar T, std::floating_point U>
std::pair< std::vector< T >, int >	allocate_coefficient_storage (const Form< T, U > &form, IntegralType integral_type, int id)
	Allocate storage for coefficients of a pair (integral_type, / id) from a Form.
template<dolfinx::scalar T, std::floating_point U>
std::map< std::pair< IntegralType, int >, std::pair< std::vector< T >, int > >	allocate_coefficient_storage (const Form< T, U > &form)
	Allocate memory for packed coefficients of a Form.
template<dolfinx::scalar T, std::floating_point U>
void	pack_coefficients (const Form< T, U > &form, IntegralType integral_type, int id, std::span< T > c, int cstride)
	Pack coefficients of a Form for a given integral type and domain id.
template<dolfinx::scalar T, std::floating_point U = scalar_value_type_t<T>>
Expression< T, U >	create_expression (const ufcx_expression &e, const std::vector< std::shared_ptr< const Function< T, U > > > &coefficients, const std::vector< std::shared_ptr< const Constant< T > > > &constants, std::shared_ptr< const FunctionSpace< U > > argument_function_space=nullptr)
	Create Expression from UFC.
template<dolfinx::scalar T, std::floating_point U = scalar_value_type_t<T>>
Expression< T, U >	create_expression (const ufcx_expression &e, const std::map< std::string, std::shared_ptr< const Function< T, U > > > &coefficients, const std::map< std::string, std::shared_ptr< const Constant< T > > > &constants, std::shared_ptr< const FunctionSpace< U > > argument_function_space=nullptr)
	Create Expression from UFC input (with named coefficients and constants).
template<dolfinx::scalar T, std::floating_point U>
void	pack_coefficients (const Form< T, U > &form, std::map< std::pair< IntegralType, int >, std::pair< std::vector< T >, int > > &coeffs)
	Pack coefficients of a Form.
template<dolfinx::scalar T, std::floating_point U>
std::pair< std::vector< T >, int >	pack_coefficients (const Expression< T, U > &e, std::span< const std::int32_t > entities, std::size_t estride)
	Pack coefficients of a Expression u for a give list of active entities.
template<typename U >
std::vector< typename U::scalar_type >	pack_constants (const U &u)
	Pack constants of u into a single array ready for assembly.

Detailed Description

Functions supporting finite element method operations.

Function Documentation

get_cell_facet_pairs()

template<int num_cells>

std::array< std::int32_t, 2 *num_cells > get_cell_facet_pairs	(	std::int32_t	f,
		std::span< const std::int32_t >	cells,
		const graph::AdjacencyList< std::int32_t > &	c_to_f )

Helper function to get an array of of (cell, local_facet) pairs corresponding to a given facet index.

Parameters

[in]	f	Facet index
[in]	cells	List of cells incident to the facet
[in]	c_to_f	Cell to facet connectivity

Returns

Vector of (cell, local_facet) pairs

pack_coefficient_entity()

template<dolfinx::scalar T, std::floating_point U>

void pack_coefficient_entity	(	std::span< T >	c,
		int	cstride,
		const Function< T, U > &	u,
		std::span< const std::uint32_t >	cell_info,
		std::span< const std::int32_t >	entities,
		std::size_t	estride,
		FetchCells auto &&	fetch_cells,
		std::int32_t	offset )

Pack a single coefficient for a set of active entities.

Parameters

[out]	c	Coefficient to be packed.
[in]	cstride	Total number of coefficient values to pack for each entity.
[in]	u	Function to extract coefficient data from.
[in]	cell_info	Array of bytes describing which transformation has to be applied on the cell to map it to the reference element.
[in]	entities	Set of active entities.
[in]	estride	Stride for each entity in active entities.
[in]	fetch_cells	Function that fetches the cell index for an entity in active_entities.
[in]	offset	The offset for c.