basix::moments Namespace Reference

Functions to create integral moment DOFs. More...

Functions
std::pair< std::vector< xt::xtensor< double, 2 > >, std::vector< xt::xtensor< double, 3 > > >	make_integral_moments (const FiniteElement &moment_space, cell::type celltype, std::size_t value_size, int q_deg)
std::pair< std::vector< xt::xtensor< double, 2 > >, std::vector< xt::xtensor< double, 3 > > >	make_dot_integral_moments (const FiniteElement &V, cell::type celltype, std::size_t value_size, int q_deg)
std::pair< std::vector< xt::xtensor< double, 2 > >, std::vector< xt::xtensor< double, 3 > > >	make_tangent_integral_moments (const FiniteElement &V, cell::type celltype, std::size_t value_size, int q_deg)
std::pair< std::vector< xt::xtensor< double, 2 > >, std::vector< xt::xtensor< double, 3 > > >	make_normal_integral_moments (const FiniteElement &V, cell::type celltype, std::size_t value_size, int q_deg)

Detailed Description

Functions to create integral moment DOFs.

Function Documentation

make_dot_integral_moments()

std::pair< std::vector< xt::xtensor< double, 2 > >, std::vector< xt::xtensor< double, 3 > > > basix::moments::make_dot_integral_moments	(	const FiniteElement &	V,
		cell::type	celltype,
		std::size_t	value_size,
		int	q_deg
	)

Make interpolation points and weights for dot product integral moments

These will represent the integral of each function in the moment space over each sub entity of the moment space's cell type in a cell with the given type. For example, if the input cell type is a triangle and the moment space is a P1 space on an edge, this will perform two integrals for each of the 3 edges of the triangle.

Todo:

Clarify what happens value size of the moment space is less than value_size.

Parameters

V	The space to compute the integral moments against
celltype	The cell type of the cell on which the space is being defined
value_size	The value size of the space being defined
q_deg	The quadrature degree used for the integrals

Returns

(interpolation points, interpolation matrix)

make_integral_moments()

std::pair< std::vector< xt::xtensor< double, 2 > >, std::vector< xt::xtensor< double, 3 > > > basix::moments::make_integral_moments	(	const FiniteElement &	moment_space,
		cell::type	celltype,
		std::size_t	value_size,
		int	q_deg
	)

Make interpolation points and weights for simple integral moments

These will represent the integral of each function in the moment space over each sub entity of the moment space's cell type in a cell with the given type. For example, if the input cell type is a triangle, and the moment space is a P1 space on an edge, this will perform two integrals for each of the 3 edges of the triangle.

Parameters

moment_space	The space to compute the integral moments against
celltype	The cell type of the cell on which the space is being defined
value_size	The value size of the space being defined
q_deg	The quadrature degree used for the integrals

Returns

(interpolation points, interpolation matrix)

make_normal_integral_moments()

std::pair< std::vector< xt::xtensor< double, 2 > >, std::vector< xt::xtensor< double, 3 > > > basix::moments::make_normal_integral_moments	(	const FiniteElement &	V,
		cell::type	celltype,
		std::size_t	value_size,
		int	q_deg
	)

Compute interpolation points and weights for normal integral moments

These can only be used when the moment space is defined on facets of the cell

Parameters

[in]	V	The space to compute the integral moments against
[in]	celltype	The cell type of the cell on which the space is being defined
[in]	value_size	The value size of the space being defined
[in]	q_deg	The quadrature degree used for the integrals

Returns

(interpolation points, interpolation matrix)

make_tangent_integral_moments()

std::pair< std::vector< xt::xtensor< double, 2 > >, std::vector< xt::xtensor< double, 3 > > > basix::moments::make_tangent_integral_moments	(	const FiniteElement &	V,
		cell::type	celltype,
		std::size_t	value_size,
		int	q_deg
	)

Make interpolation points and weights for tangent integral moments

These can only be used when the moment space is defined on edges of the cell

Parameters

V	The space to compute the integral moments against
celltype	The cell type of the cell on which the space is being defined
value_size	The value size of the space being defined the space
q_deg	The quadrature degree used for the integrals

Returns

(interpolation points, interpolation matrix)