gko::matrix::Identity< ValueType > Class Template Reference

This class is a utility which efficiently implements the identity matrix (a linear operator which maps each vector to itself). More...

#include <ginkgo/core/matrix/identity.hpp>

Inheritance diagram for gko::matrix::Identity< ValueType >:

Collaboration diagram for gko::matrix::Identity< ValueType >:

Public Types
using	value_type = ValueType
using	transposed_type = Identity< ValueType >
Public Types inherited from gko::EnablePolymorphicAssignment< Identity< ValueType > >
using	result_type = Identity< ValueType >
Public Types inherited from gko::ConvertibleTo< Identity< ValueType > >
using	result_type = Identity< ValueType >

Public Member Functions
std::unique_ptr< LinOp >	transpose () const override
	Returns a LinOp representing the transpose of the Transposable object. More...
std::unique_ptr< LinOp >	conj_transpose () const override
	Returns a LinOp representing the conjugate transpose of the Transposable object. More...
Public Member Functions inherited from gko::EnableLinOp< Identity< ValueType > >
const Identity< ValueType > *	apply (ptr_param< const LinOp > b, ptr_param< LinOp > x) const
Identity< ValueType > *	apply (ptr_param< const LinOp > b, ptr_param< LinOp > x)
const Identity< ValueType > *	apply (ptr_param< const LinOp > alpha, ptr_param< const LinOp > b, ptr_param< const LinOp > beta, ptr_param< LinOp > x) const
Identity< ValueType > *	apply (ptr_param< const LinOp > alpha, ptr_param< const LinOp > b, ptr_param< const LinOp > beta, ptr_param< LinOp > x)
Public Member Functions inherited from gko::EnableAbstractPolymorphicObject< Identity< ValueType >, LinOp >
std::unique_ptr< Identity< ValueType > >	create_default (std::shared_ptr< const Executor > exec) const
std::unique_ptr< Identity< ValueType > >	create_default () const
std::unique_ptr< Identity< ValueType > >	clone (std::shared_ptr< const Executor > exec) const
std::unique_ptr< Identity< ValueType > >	clone () const
Identity< ValueType > *	copy_from (const PolymorphicObject *other)
std::enable_if_t< std::is_base_of< PolymorphicObject, std::decay_t< Derived > >::value, Identity< ValueType > > *	copy_from (std::unique_ptr< Derived > &&other)
std::enable_if_t< std::is_base_of< PolymorphicObject, std::decay_t< Derived > >::value, Identity< ValueType > > *	copy_from (const std::unique_ptr< Derived > &other)
Identity< ValueType > *	copy_from (const std::shared_ptr< const PolymorphicObject > &other)
Identity< ValueType > *	move_from (ptr_param< PolymorphicObject > other)
Identity< ValueType > *	clear ()
Public Member Functions inherited from gko::LinOp
LinOp *	apply (ptr_param< const LinOp > b, ptr_param< LinOp > x)
	Applies a linear operator to a vector (or a sequence of vectors). More...
const LinOp *	apply (ptr_param< const LinOp > b, ptr_param< LinOp > x) const
LinOp *	apply (ptr_param< const LinOp > alpha, ptr_param< const LinOp > b, ptr_param< const LinOp > beta, ptr_param< LinOp > x)
	Performs the operation x = alpha * op(b) + beta * x. More...
const LinOp *	apply (ptr_param< const LinOp > alpha, ptr_param< const LinOp > b, ptr_param< const LinOp > beta, ptr_param< LinOp > x) const
const dim< 2 > &	get_size () const noexcept
	Returns the size of the operator. More...
virtual bool	apply_uses_initial_guess () const
	Returns true if the linear operator uses the data given in x as an initial guess. More...
LinOp &	operator= (const LinOp &)=default
	Copy-assigns a LinOp. More...
LinOp &	operator= (LinOp &&other)
	Move-assigns a LinOp. More...
	LinOp (const LinOp &)=default
	Copy-constructs a LinOp. More...
	LinOp (LinOp &&other)
	Move-constructs a LinOp. More...
Public Member Functions inherited from gko::EnableAbstractPolymorphicObject< LinOp >
std::unique_ptr< LinOp >	create_default (std::shared_ptr< const Executor > exec) const
std::unique_ptr< LinOp >	create_default () const
std::unique_ptr< LinOp >	clone (std::shared_ptr< const Executor > exec) const
std::unique_ptr< LinOp >	clone () const
LinOp *	copy_from (const PolymorphicObject *other)
std::enable_if_t< std::is_base_of< PolymorphicObject, std::decay_t< Derived > >::value, LinOp > *	copy_from (std::unique_ptr< Derived > &&other)
std::enable_if_t< std::is_base_of< PolymorphicObject, std::decay_t< Derived > >::value, LinOp > *	copy_from (const std::unique_ptr< Derived > &other)
LinOp *	copy_from (const std::shared_ptr< const PolymorphicObject > &other)
LinOp *	move_from (ptr_param< PolymorphicObject > other)
LinOp *	clear ()
Public Member Functions inherited from gko::PolymorphicObject
PolymorphicObject &	operator= (const PolymorphicObject &)
std::unique_ptr< PolymorphicObject >	create_default (std::shared_ptr< const Executor > exec) const
	Creates a new "default" object of the same dynamic type as this object. More...
std::unique_ptr< PolymorphicObject >	create_default () const
	Creates a new "default" object of the same dynamic type as this object. More...
std::unique_ptr< PolymorphicObject >	clone (std::shared_ptr< const Executor > exec) const
	Creates a clone of the object. More...
std::unique_ptr< PolymorphicObject >	clone () const
	Creates a clone of the object. More...
PolymorphicObject *	copy_from (const PolymorphicObject *other)
	Copies another object into this object. More...
template<typename Derived , typename Deleter >
std::enable_if_t< std::is_base_of< PolymorphicObject, std::decay_t< Derived > >::value, PolymorphicObject > *	copy_from (std::unique_ptr< Derived, Deleter > &&other)
	Moves another object into this object. More...
template<typename Derived , typename Deleter >
std::enable_if_t< std::is_base_of< PolymorphicObject, std::decay_t< Derived > >::value, PolymorphicObject > *	copy_from (const std::unique_ptr< Derived, Deleter > &other)
	Copies another object into this object. More...
PolymorphicObject *	copy_from (const std::shared_ptr< const PolymorphicObject > &other)
	Copies another object into this object. More...
PolymorphicObject *	move_from (ptr_param< PolymorphicObject > other)
	Moves another object into this object. More...
PolymorphicObject *	clear ()
	Transforms the object into its default state. More...
std::shared_ptr< const Executor >	get_executor () const noexcept
	Returns the Executor of the object. More...
Public Member Functions inherited from gko::log::EnableLogging< PolymorphicObject >
void	add_logger (std::shared_ptr< const Logger > logger) override
void	remove_logger (const Logger *logger) override
void	remove_logger (ptr_param< const Logger > logger)
const std::vector< std::shared_ptr< const Logger > > &	get_loggers () const override
void	clear_loggers () override
Public Member Functions inherited from gko::log::Loggable
void	remove_logger (ptr_param< const Logger > logger)
Public Member Functions inherited from gko::EnablePolymorphicAssignment< Identity< ValueType > >
void	convert_to (result_type *result) const override
	Converts the implementer to an object of type result_type. More...
void	move_to (result_type *result) override
	Converts the implementer to an object of type result_type by moving data from this object. More...
Public Member Functions inherited from gko::ConvertibleTo< Identity< ValueType > >
void	convert_to (ptr_param< result_type > result) const
void	move_to (ptr_param< result_type > result)

Friends
class	EnablePolymorphicObject< Identity, LinOp >
class	EnableCreateMethod< Identity >

Additional Inherited Members
Static Public Member Functions inherited from gko::EnableCreateMethod< Identity< ValueType > >
static std::unique_ptr< Identity< ValueType > >	create (Args &&... args)

Detailed Description

template<typename ValueType = default_precision>
class gko::matrix::Identity< ValueType >

This class is a utility which efficiently implements the identity matrix (a linear operator which maps each vector to itself).

Thus, objects of the Identity class always represent a square matrix, and don't require any storage for their values. The apply method is implemented as a simple copy (or a linear combination).

Note

This class is useful when composing it with other operators. For example, it can be used instead of a preconditioner in Krylov solvers, if one wants to run a "plain" solver, without using a preconditioner.

Template Parameters

ValueType

precision of matrix elements

Member Function Documentation

conj_transpose()

template<typename ValueType = default_precision>

std::unique_ptr<LinOp> gko::matrix::Identity< ValueType >::conj_transpose ( ) const

overridevirtual

Returns a LinOp representing the conjugate transpose of the Transposable object.

Returns

a pointer to the new conjugate transposed object

Implements gko::Transposable.

transpose()

template<typename ValueType = default_precision>

std::unique_ptr<LinOp> gko::matrix::Identity< ValueType >::transpose ( ) const

overridevirtual

Returns a LinOp representing the transpose of the Transposable object.

Returns

a pointer to the new transposed object

Implements gko::Transposable.

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

• ginkgo/core/matrix/identity.hpp