assembler.h File Reference

Functions supporting assembly of finite element fem::Form and fem::Expression. More...

#include "Function.h"
#include "FunctionSpace.h"
#include "assemble_expression_impl.h"
#include "assemble_matrix_impl.h"
#include "assemble_scalar_impl.h"
#include "assemble_vector_impl.h"
#include "pack.h"
#include "traits.h"
#include "utils.h"
#include <algorithm>
#include <basix/mdspan.hpp>
#include <cstdint>
#include <dolfinx/common/types.h>
#include <memory>
#include <optional>
#include <span>
#include <vector>

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Namespaces
namespace	dolfinx
	Top-level namespace.
namespace	dolfinx::fem
	Finite element method functionality.

Functions
template<dolfinx::scalar T, std::floating_point U>
void	tabulate_expression (std::span< T > values, const fem::Expression< T, U > &e, md::mdspan< const T, md::dextents< std::size_t, 2 > > coeffs, std::span< const T > constants, const mesh::Mesh< U > &mesh, fem::MDSpan2 auto entities, std::optional< std::pair< std::reference_wrapper< const FiniteElement< U > >, std::size_t > > element)
	Evaluate an Expression on cells or facets.
template<dolfinx::scalar T, std::floating_point U>
void	tabulate_expression (std::span< T > values, const fem::Expression< T, U > &e, const mesh::Mesh< U > &mesh, fem::MDSpan2 auto entities)
	Evaluate an Expression on cells or facets.
template<dolfinx::scalar T>
std::map< std::pair< IntegralType, int >, std::pair< std::span< const T >, int > >	make_coefficients_span (const std::map< std::pair< IntegralType, int >, std::pair< std::vector< T >, int > > &coeffs)
	Create a map of std::spans from a map of std::vectors.
template<dolfinx::scalar T, std::floating_point U>
T	assemble_scalar (const Form< T, U > &M, std::span< const T > constants, const std::map< std::pair< IntegralType, int >, std::pair< std::span< const T >, int > > &coefficients)
	Assemble functional into scalar.
template<dolfinx::scalar T, std::floating_point U>
T	assemble_scalar (const Form< T, U > &M)
	Assemble functional into scalar.
template<dolfinx::scalar T, std::floating_point U>
void	assemble_vector (std::span< T > b, const Form< T, U > &L, std::span< const T > constants, const std::map< std::pair< IntegralType, int >, std::pair< std::span< const T >, int > > &coefficients)
	Assemble linear form into a vector.
template<dolfinx::scalar T, std::floating_point U>
void	assemble_vector (std::span< T > b, const Form< T, U > &L)
	Assemble linear form into a vector.
template<dolfinx::scalar T, std::floating_point U>
void	apply_lifting (std::span< T > b, std::vector< std::optional< std::reference_wrapper< const Form< T, U > > > > a, const std::vector< std::span< const T > > &constants, const std::vector< std::map< std::pair< IntegralType, int >, std::pair< std::span< const T >, int > > > &coeffs, const std::vector< std::vector< std::reference_wrapper< const DirichletBC< T, U > > > > &bcs1, const std::vector< std::span< const T > > &x0, T alpha)
	Modify the right-hand side vector to account for constraints (Dirichlet boundary condition constraints). This modification is known as 'lifting'.
template<dolfinx::scalar T, std::floating_point U>
void	apply_lifting (std::span< T > b, std::vector< std::optional< std::reference_wrapper< const Form< T, U > > > > a, const std::vector< std::vector< std::reference_wrapper< const DirichletBC< T, U > > > > &bcs1, const std::vector< std::span< const T > > &x0, T alpha)
	Modify the right-hand side vector to account for constraints (Dirichlet boundary conditions constraints). This modification is known as 'lifting'.
template<dolfinx::scalar T, std::floating_point U>
void	assemble_matrix (la::MatSet< T > auto mat_add, const Form< T, U > &a, std::span< const T > constants, const std::map< std::pair< IntegralType, int >, std::pair< std::span< const T >, int > > &coefficients, std::span< const std::int8_t > dof_marker0, std::span< const std::int8_t > dof_marker1)
	Assemble bilinear form into a matrix. Matrix must already be initialised. Does not zero or finalise the matrix.
template<dolfinx::scalar T, std::floating_point U>
void	assemble_matrix (auto mat_add, const Form< T, U > &a, std::span< const T > constants, const std::map< std::pair< IntegralType, int >, std::pair< std::span< const T >, int > > &coefficients, const std::vector< std::reference_wrapper< const DirichletBC< T, U > > > &bcs)
	Assemble bilinear form into a matrix.
template<dolfinx::scalar T, std::floating_point U>
void	assemble_matrix (auto mat_add, const Form< T, U > &a, const std::vector< std::reference_wrapper< const DirichletBC< T, U > > > &bcs)
	Assemble bilinear form into a matrix.
template<dolfinx::scalar T, std::floating_point U>
void	assemble_matrix (auto mat_add, const Form< T, U > &a, std::span< const std::int8_t > dof_marker0, std::span< const std::int8_t > dof_marker1)
	Assemble bilinear form into a matrix. Matrix must already be initialised. Does not zero or finalise the matrix.
template<dolfinx::scalar T>
void	set_diagonal (auto set_fn, std::span< const std::int32_t > rows, T diagonal=1.0)
	Sets a value to the diagonal of a matrix for specified rows.
template<dolfinx::scalar T, std::floating_point U>
void	set_diagonal (auto set_fn, const FunctionSpace< U > &V, const std::vector< std::reference_wrapper< const DirichletBC< T, U > > > &bcs, T diagonal=1.0)
	Sets a value to the diagonal of the matrix for rows with a Dirichlet boundary conditions applied.

Detailed Description

Functions supporting assembly of finite element fem::Form and fem::Expression.