dolfin::BasisFunction Class Reference

Represention of a finite element basis function. More...

#include <BasisFunction.h>

Inheritance diagram for dolfin::BasisFunction:

Collaboration diagram for dolfin::BasisFunction:

Public Member Functions
	BasisFunction (std::size_t index, std::shared_ptr< const FiniteElement > element, const std::vector< double > &coordinate_dofs)
	~BasisFunction ()
	Destructor.
void	update_index (std::size_t index)
void	eval (double *values, const double *x) const
void	eval_derivatives (double *values, const double *x, std::size_t n) const
void	evaluate (double *values, const double *coordinates, const ufc::cell &cell) const

Detailed Description

Represention of a finite element basis function.

It can be used for computation of basis function values and derivatives.

Evaluation of basis functions is also possible through the use of the functions evaluate_basis and evaluate_basis_derivatives available in the FiniteElement class. The BasisFunction class relies on these functions for evaluation but also implements the ufc::function interface which allows evaluate_dof to be evaluated for a basis function (on a possibly different element).

Constructor & Destructor Documentation

BasisFunction()

dolfin::BasisFunction::BasisFunction ( std::size_t  index, std::shared_ptr< const FiniteElement >  element, const std::vector< double > &  coordinate_dofs  )

inline

Create basis function with given index on element on given cell

Parameters

index	(std::size_t) The index of the basis function.
element	(FiniteElement) The element to create basis function on.
coordinate_dofs	(std::vector<double>&) The coordinate dofs of the cell

Member Function Documentation

eval()

void dolfin::BasisFunction::eval ( double *  values, const double *  x  ) const

inline

Evaluate basis function at given point

Parameters

values	(double) The values of the function at the point.
x	(double) The coordinates of the point.

eval_derivatives()

void dolfin::BasisFunction::eval_derivatives ( double *  values, const double *  x, std::size_t  n  ) const

inline

Evaluate all order n derivatives at given point

Parameters

values	(double) The values of derivatives at the point.
x	(double) The coordinates of the point.
n	(std::size_t) The order of derivation.

evaluate()

void dolfin::BasisFunction::evaluate ( double *  values, const double *  coordinates, const ufc::cell &  cell  ) const

inline

Evaluate function at given point in cell

Parameters

values	(double) The values of the function at the point..
coordinates	(double) The coordinates of the point.
cell	(ufc::cell) The cell.

update_index()

void dolfin::BasisFunction::update_index ( std::size_t  index )

inline

Update the basis function index

Parameters

index

(std::size_t) The index of the basis function.

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The documentation for this class was generated from the following file:

• /home/fenics/shared/dolfin/dolfin/fem/BasisFunction.h