#include <deal.II/base/function.h>

Inheritance diagram for ComponentSelectFunction< dim, Number >:

Public Member Functions
	ComponentSelectFunction (const unsigned int selected, const Number value, const unsigned int n_components)

	ComponentSelectFunction (const unsigned int selected, const unsigned int n_components)

	ComponentSelectFunction (const std::pair< unsigned int, unsigned int > &selected, const unsigned int n_components)

virtual void	substitute_function_value_with (const ConstantFunction< dim, Number > &f)

virtual void	vector_value (const Point< dim > &p, Vector< Number > &return_value) const

virtual void	vector_value_list (const std::vector< Point< dim > > &points, std::vector< Vector< Number > > &values) const

std::size_t	memory_consumption () const

Public Member Functions inherited from ConstantFunction< dim, Number >
	ConstantFunction (const Number value, const unsigned int n_components=1)

	ConstantFunction (const std::vector< Number > &values)

	ConstantFunction (const Vector< Number > &values)

	ConstantFunction (const Number *begin_ptr, const unsigned int n_components)

virtual	~ConstantFunction ()

virtual Number	value (const Point< dim > &p, const unsigned int component) const

virtual void	value_list (const std::vector< Point< dim > > &points, std::vector< Number > &return_values, const unsigned int component=0) const

Public Member Functions inherited from ZeroFunction< dim, Number >
	ZeroFunction (const unsigned int n_components=1)

virtual	~ZeroFunction ()

virtual Tensor< 1, dim, Number >	gradient (const Point< dim > &p, const unsigned int component=0) const

virtual void	vector_gradient (const Point< dim > &p, std::vector< Tensor< 1, dim, Number > > &gradients) const

virtual void	gradient_list (const std::vector< Point< dim > > &points, std::vector< Tensor< 1, dim, Number > > &gradients, const unsigned int component=0) const

virtual void	vector_gradient_list (const std::vector< Point< dim > > &points, std::vector< std::vector< Tensor< 1, dim, Number > > > &gradients) const

Public Member Functions inherited from Function< dim, Number >
	Function (const unsigned int n_components=1, const Number initial_time=0.0)

virtual	~Function ()=0

Function &	operator= (const Function &f)

virtual void	vector_values (const std::vector< Point< dim > > &points, std::vector< std::vector< Number > > &values) const

virtual void	vector_gradients (const std::vector< Point< dim > > &points, std::vector< std::vector< Tensor< 1, dim, Number > > > &gradients) const

virtual Number	laplacian (const Point< dim > &p, const unsigned int component=0) const

virtual void	vector_laplacian (const Point< dim > &p, Vector< Number > &values) const

virtual void	laplacian_list (const std::vector< Point< dim > > &points, std::vector< Number > &values, const unsigned int component=0) const

virtual void	vector_laplacian_list (const std::vector< Point< dim > > &points, std::vector< Vector< Number > > &values) const

virtual SymmetricTensor< 2, dim, Number >	hessian (const Point< dim > &p, const unsigned int component=0) const

virtual void	vector_hessian (const Point< dim > &p, std::vector< SymmetricTensor< 2, dim, Number > > &values) const

virtual void	hessian_list (const std::vector< Point< dim > > &points, std::vector< SymmetricTensor< 2, dim, Number > > &values, const unsigned int component=0) const

virtual void	vector_hessian_list (const std::vector< Point< dim > > &points, std::vector< std::vector< SymmetricTensor< 2, dim, Number > > > &values) const

std::size_t	memory_consumption () const

Public Member Functions inherited from FunctionTime< Number >
	FunctionTime (const Number initial_time=Number(0.0))

virtual	~FunctionTime ()

Number	get_time () const

virtual void	set_time (const Number new_time)

virtual void	advance_time (const Number delta_t)

Public Member Functions inherited from Subscriptor
	Subscriptor ()

	Subscriptor (const Subscriptor &)

	Subscriptor (Subscriptor &&)

virtual	~Subscriptor ()

Subscriptor &	operator= (const Subscriptor &)

Subscriptor &	operator= (Subscriptor &&)

void	subscribe (const char *identifier=0) const

void	unsubscribe (const char *identifier=0) const

unsigned int	n_subscriptions () const

void	list_subscribers () const

template<class Archive >
void	serialize (Archive &ar, const unsigned int version)

Protected Attributes
const std::pair< unsigned int, unsigned int >	selected_components

Protected Attributes inherited from ConstantFunction< dim, Number >
std::vector< Number >	function_value_vector

Additional Inherited Members
Static Public Member Functions inherited from Subscriptor
static ::ExceptionBase &	ExcInUse (int arg1, char *arg2, std::string &arg3)

static ::ExceptionBase &	ExcNoSubscriber (char arg1, char arg2)

Public Attributes inherited from Function< dim, Number >
const unsigned int	n_components

Static Public Attributes inherited from Function< dim, Number >
static const unsigned int	dimension = dim

Detailed Description

template<int dim, typename Number = double>
class ComponentSelectFunction< dim, Number >

This is a constant vector-valued function, in which one or more components of the vector have a constant value and all other components are zero. It is especially useful as a weight function for VectorTools::integrate_difference, where it allows to integrate only one or a few vector components, rather than the entire vector-valued solution. In other words, it acts as a component mask with a single component selected (see the the glossary entry on component masks). See the step-20 tutorial program for a detailed explanation and a use case.

Author: Guido Kanschat, 2000, Wolfgang Bangerth 2006

Definition at line 496 of file function.h.

Constructor & Destructor Documentation

◆ ComponentSelectFunction() [1/3]

template<int dim, typename Number = double>

ComponentSelectFunction< dim, Number >::ComponentSelectFunction	(	const unsigned int	selected,
		const Number	value,
		const unsigned int	n_components
	)

Constructor if only a single component shall be non-zero. Arguments denote the component selected, the value for that component and the total number of vector components.

◆ ComponentSelectFunction() [2/3]

template<int dim, typename Number = double>

ComponentSelectFunction< dim, Number >::ComponentSelectFunction	(	const unsigned int	selected,
		const unsigned int	n_components
	)

Constructor. As before, but the value for the selected component is assumed to be one. In essence, this function then works as a mask.

◆ ComponentSelectFunction() [3/3]

template<int dim, typename Number = double>

ComponentSelectFunction< dim, Number >::ComponentSelectFunction	(	const std::pair< unsigned int, unsigned int > &	selected,
		const unsigned int	n_components
	)

Constructor if multiple components shall have non-zero, unit values (i.e. this should be a mask for multiple components). The first argument denotes a half-open interval of components (for example std::pair(0,dim) for the first dim components), and the second argument is the total number of vector components.

Member Function Documentation

◆ substitute_function_value_with()

template<int dim, typename Number = double>

virtual void ComponentSelectFunction< dim, Number >::substitute_function_value_with ( const ConstantFunction< dim, Number > & f )

virtual

Substitute function value with value of a ConstantFunction<dim, Number> object and keep the current selection pattern.

This is useful if you want to have different values in different components since the provided constructors of ComponentSelectFunction<dim, Number> class can only have same value for all components.

Note: : we copy the underlying component value data from f from its beginning. So the number of components of f cannot be less than the calling object.

◆ vector_value()

template<int dim, typename Number = double>

virtual void ComponentSelectFunction< dim, Number >::vector_value	(	const Point< dim > &	p,
		Vector< Number > &	return_value
	)		const

virtual

Return the value of the function at the given point for all components.

Reimplemented from ConstantFunction< dim, Number >.

◆ vector_value_list()

template<int dim, typename Number = double>

virtual void ComponentSelectFunction< dim, Number >::vector_value_list	(	const std::vector< Point< dim > > &	points,
		std::vector< Vector< Number > > &	values
	)		const

virtual

Set values to the point values of the function at the points, for all components. It is assumed that values already has the right size, i.e. the same size as the points array.

Reimplemented from ConstantFunction< dim, Number >.

◆ memory_consumption()

template<int dim, typename Number = double>

std::size_t ComponentSelectFunction< dim, Number >::memory_consumption ( ) const

Return an estimate for the memory consumption, in bytes, of this object. This is not exact (but will usually be close) because calculating the memory usage of trees (e.g., std::map) is difficult.

Member Data Documentation

◆ selected_components

template<int dim, typename Number = double>

const std::pair<unsigned int,unsigned int> ComponentSelectFunction< dim, Number >::selected_components

protected

Half-open interval of the indices of selected components.

Definition at line 567 of file function.h.

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

deal.II/base/function.h

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

template<int dim, typename Number = double> class ComponentSelectFunction< dim, Number >

Constructor & Destructor Documentation

◆ ComponentSelectFunction() [1/3]

◆ ComponentSelectFunction() [2/3]

◆ ComponentSelectFunction() [3/3]

Member Function Documentation

◆ substitute_function_value_with()

◆ vector_value()

◆ vector_value_list()

◆ memory_consumption()

Member Data Documentation

◆ selected_components

template<int dim, typename Number = double>
class ComponentSelectFunction< dim, Number >