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

Inheritance diagram for Functions::ConstantFunction< dim, RangeNumberType >:

Public Member Functions
	ConstantFunction (const RangeNumberType value, const unsigned int n_components=1)

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

	ConstantFunction (const Vector< RangeNumberType > &values)

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

virtual RangeNumberType	value (const Point< dim > &p, const unsigned int component=0) const override

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

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

virtual void	vector_value_list (const std::vector< Point< dim >> &points, std::vector< Vector< RangeNumberType >> &return_values) const override

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

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

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

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

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

virtual	~Function () override=0

Function &	operator= (const Function &f)

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

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

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

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

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

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

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

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

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

std::size_t	memory_consumption () const

Public Member Functions inherited from FunctionTime< numbers::NumberTraits< RangeNumberType >::real_type >
	FunctionTime (const numbers::NumberTraits< RangeNumberType >::real_type initial_time=numbers::NumberTraits< RangeNumberType >::real_type(0.0))

virtual	~FunctionTime ()=default

numbers::NumberTraits< RangeNumberType >::real_type	get_time () const

virtual void	set_time (const numbers::NumberTraits< RangeNumberType >::real_type new_time)

virtual void	advance_time (const numbers::NumberTraits< RangeNumberType >::real_type delta_t)

Public Member Functions inherited from Subscriptor
	Subscriptor ()

	Subscriptor (const Subscriptor &)

	Subscriptor (Subscriptor &&) noexcept

virtual	~Subscriptor ()

Subscriptor &	operator= (const Subscriptor &)

Subscriptor &	operator= (Subscriptor &&) noexcept

void	subscribe (std::atomic< bool > *const validity, const std::string &identifier="") const

void	unsubscribe (std::atomic< bool > *const validity, const std::string &identifier="") const

unsigned int	n_subscriptions () const

template<typename StreamType >
void	list_subscribers (StreamType &stream) const

void	list_subscribers () const

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

Protected Attributes
std::vector< RangeNumberType >	function_value_vector

Additional Inherited Members
Public Types inherited from Function< dim, RangeNumberType >
using	time_type = typename FunctionTime< typename numbers::NumberTraits< RangeNumberType >::real_type >::time_type

Public Types inherited from FunctionTime< numbers::NumberTraits< RangeNumberType >::real_type >
using	time_type = numbers::NumberTraits< RangeNumberType >::real_type

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

static ::ExceptionBase &	ExcNoSubscriber (std::string arg1, std::string arg2)

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

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

Detailed Description

template<int dim, typename RangeNumberType = double>
class Functions::ConstantFunction< dim, RangeNumberType >

Provide a function which always returns the constant values handed to the constructor.

Author: Wolfgang Bangerth, 1998, 1999, Lei Qiao, 2015

Definition at line 404 of file function.h.

Constructor & Destructor Documentation

◆ ConstantFunction() [1/4]

template<int dim, typename RangeNumberType = double>

Functions::ConstantFunction< dim, RangeNumberType >::ConstantFunction	(	const RangeNumberType	value,
		const unsigned int	n_components = `1`
	)

Constructor; set values of all components to the provided one. The default number of components is one.

◆ ConstantFunction() [2/4]

template<int dim, typename RangeNumberType = double>

Functions::ConstantFunction< dim, RangeNumberType >::ConstantFunction ( const std::vector< RangeNumberType > & values )

Constructor; takes an std::vector<RangeNumberType> object as an argument. The number of components is determined by values.size().

◆ ConstantFunction() [3/4]

template<int dim, typename RangeNumberType = double>

Functions::ConstantFunction< dim, RangeNumberType >::ConstantFunction ( const Vector< RangeNumberType > & values )

Constructor; takes an Vector<RangeNumberType> object as an argument. The number of components is determined by values.size().

◆ ConstantFunction() [4/4]

template<int dim, typename RangeNumberType = double>

Functions::ConstantFunction< dim, RangeNumberType >::ConstantFunction	(	const RangeNumberType *	begin_ptr,
		const unsigned int	n_components
	)

Constructor; uses whatever stores in [begin_ptr, begin_ptr+n_components) to initialize a new object.

Member Function Documentation

◆ value()

template<int dim, typename RangeNumberType = double>

virtual RangeNumberType Functions::ConstantFunction< dim, RangeNumberType >::value	(	const Point< dim > &	p,
		const unsigned int	component = `0`
	)		const

overridevirtual

Return the value of the function at the given point. Unless there is only one component (i.e. the function is scalar), you should state the component you want to have evaluated; it defaults to zero, i.e. the first component.

Reimplemented from Function< dim, RangeNumberType >.

◆ vector_value()

template<int dim, typename RangeNumberType = double>

virtual void Functions::ConstantFunction< dim, RangeNumberType >::vector_value	(	const Point< dim > &	p,
		Vector< RangeNumberType > &	values
	)		const

overridevirtual

Return all components of a vector-valued function at a given point.

values shall have the right size beforehand, i.e. n_components.

The default implementation will call value() for each component.

Reimplemented from Function< dim, RangeNumberType >.

Reimplemented in ComponentSelectFunction< dim, RangeNumberType >.

◆ value_list()

template<int dim, typename RangeNumberType = double>

virtual void Functions::ConstantFunction< dim, RangeNumberType >::value_list	(	const std::vector< Point< dim >> &	points,
		std::vector< RangeNumberType > &	values,
		const unsigned int	component = `0`
	)		const

overridevirtual

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

By default, this function repeatedly calls value() for each point separately, to fill the output array.

Reimplemented from Function< dim, RangeNumberType >.

◆ vector_value_list()

template<int dim, typename RangeNumberType = double>

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

overridevirtual

Set values to the point values of the function at the points. It is assumed that values already has the right size, i.e. the same size as the points array, and that all elements be vectors with the same number of components as this function has.

By default, this function repeatedly calls vector_value() for each point separately, to fill the output array.

Reimplemented from Function< dim, RangeNumberType >.

Reimplemented in ComponentSelectFunction< dim, RangeNumberType >.

◆ gradient()

template<int dim, typename RangeNumberType = double>

virtual Tensor<1, dim, RangeNumberType> Functions::ConstantFunction< dim, RangeNumberType >::gradient	(	const Point< dim > &	p,
		const unsigned int	component = `0`
	)		const

overridevirtual

Return the gradient of the specified component of the function at the given point.

Reimplemented from Function< dim, RangeNumberType >.

◆ vector_gradient()

template<int dim, typename RangeNumberType = double>

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

overridevirtual

Return the gradient of all components of the function at the given point.

Reimplemented from Function< dim, RangeNumberType >.

◆ gradient_list()

template<int dim, typename RangeNumberType = double>

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

overridevirtual

Set gradients to the gradients of the specified component of the function at the points. It is assumed that gradients already has the right size, i.e. the same size as the points array.

Reimplemented from Function< dim, RangeNumberType >.

◆ vector_gradient_list()

template<int dim, typename RangeNumberType = double>

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

overridevirtual

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

The outer loop over gradients is over the points in the list, the inner loop over the different components of the function.

Reimplemented from Function< dim, RangeNumberType >.

Member Data Documentation

◆ function_value_vector

template<int dim, typename RangeNumberType = double>

std::vector<RangeNumberType> Functions::ConstantFunction< dim, RangeNumberType >::function_value_vector

protected

Store the constant function value vector.

Definition at line 479 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 RangeNumberType = double> class Functions::ConstantFunction< dim, RangeNumberType >

Constructor & Destructor Documentation

◆ ConstantFunction() [1/4]

◆ ConstantFunction() [2/4]

◆ ConstantFunction() [3/4]

◆ ConstantFunction() [4/4]

Member Function Documentation

◆ value()

◆ vector_value()

◆ value_list()

◆ vector_value_list()

◆ gradient()

◆ vector_gradient()

◆ gradient_list()

◆ vector_gradient_list()

Member Data Documentation

◆ function_value_vector

template<int dim, typename RangeNumberType = double>
class Functions::ConstantFunction< dim, RangeNumberType >