#include <deal.II/lac/block_vector_base.h>

Inheritance diagram for BlockVectorBase< VectorType >:

Public Types
typedef VectorType	BlockType

typedef BlockType::real_type	real_type

Public Member Functions
	BlockVectorBase ()=default

	BlockVectorBase (const BlockVectorBase &)=default

	BlockVectorBase (BlockVectorBase &&) noexcept=default

void	collect_sizes ()

void	compress (::VectorOperation::values operation)

BlockType &	block (const unsigned int i)

const BlockType &	block (const unsigned int i) const

const BlockIndices &	get_block_indices () const

unsigned int	n_blocks () const

std::size_t	size () const

IndexSet	locally_owned_elements () const

iterator	begin ()

const_iterator	begin () const

iterator	end ()

const_iterator	end () const

value_type	operator() (const size_type i) const

reference	operator() (const size_type i)

value_type	operator[] (const size_type i) const

reference	operator[] (const size_type i)

template<typename OtherNumber >
void	extract_subvector_to (const std::vector< size_type > &indices, std::vector< OtherNumber > &values) const

template<typename ForwardIterator , typename OutputIterator >
void	extract_subvector_to (ForwardIterator indices_begin, const ForwardIterator indices_end, OutputIterator values_begin) const

BlockVectorBase &	operator= (const value_type s)

BlockVectorBase &	operator= (const BlockVectorBase &V)

BlockVectorBase &	operator= (BlockVectorBase &&)=default

template<class VectorType2 >
BlockVectorBase &	operator= (const BlockVectorBase< VectorType2 > &V)

BlockVectorBase &	operator= (const VectorType &v)

template<class VectorType2 >
bool	operator== (const BlockVectorBase< VectorType2 > &v) const

value_type	operator* (const BlockVectorBase &V) const

real_type	norm_sqr () const

value_type	mean_value () const

real_type	l1_norm () const

real_type	l2_norm () const

real_type	linfty_norm () const

value_type	add_and_dot (const value_type a, const BlockVectorBase &V, const BlockVectorBase &W)

bool	in_local_range (const size_type global_index) const

bool	all_zero () const

bool	is_non_negative () const

BlockVectorBase &	operator+= (const BlockVectorBase &V)

BlockVectorBase &	operator-= (const BlockVectorBase &V)

template<typename Number >
void	add (const std::vector< size_type > &indices, const std::vector< Number > &values)

template<typename Number >
void	add (const std::vector< size_type > &indices, const Vector< Number > &values)

template<typename Number >
void	add (const size_type n_elements, const size_type indices, const Number values)

void	add (const value_type s)

void	add (const value_type a, const BlockVectorBase &V)

void	add (const value_type a, const BlockVectorBase &V, const value_type b, const BlockVectorBase &W)

void	sadd (const value_type s, const BlockVectorBase &V)

void	sadd (const value_type s, const value_type a, const BlockVectorBase &V)

void	sadd (const value_type s, const value_type a, const BlockVectorBase &V, const value_type b, const BlockVectorBase &W)

void	sadd (const value_type s, const value_type a, const BlockVectorBase &V, const value_type b, const BlockVectorBase &W, const value_type c, const BlockVectorBase &X)

BlockVectorBase &	operator*= (const value_type factor)

BlockVectorBase &	operator/= (const value_type factor)

template<class BlockVector2 >
void	scale (const BlockVector2 &v)

template<class BlockVector2 >
void	equ (const value_type a, const BlockVector2 &V)

void	equ (const value_type a, const BlockVectorBase &V, const value_type b, const BlockVectorBase &W)

void	update_ghost_values () const

std::size_t	memory_consumption () const

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 (const char *identifier=nullptr) const

void	unsubscribe (const char *identifier=nullptr) const

unsigned int	n_subscriptions () const

void	list_subscribers () const

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

Protected Attributes
std::vector< VectorType >	components

BlockIndices	block_indices

Friends
template<typename N , bool C>
class	::internal::BlockVectorIterators::Iterator

template<typename >
class	BlockVectorBase

Additional Inherited Members
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)

Detailed Description

template<class VectorType>
class BlockVectorBase< VectorType >

A vector composed of several blocks each representing a vector of its own.

The BlockVector is a collection of vectors of a given type (e.g., deal.II Vector objects, PETScWrappers::MPI::Vector objects, etc.). Each of the vectors inside can have a different size.

The functionality of BlockVector includes everything a Vector can do, plus the access to a single Vector inside the BlockVector by block(i). It also has a complete random access iterator, just as the other Vector classes or the standard C++ library template std::vector. Therefore, all algorithms working on iterators also work with objects of this class.

While this base class implements most of the functionality by dispatching calls to its member functions to the respective functions on each of the individual blocks, this class does not actually allocate some memory or change the size of vectors. For this, the constructors, assignment operators and reinit() functions of derived classes are responsible. This class only handles the common part that is independent of the actual vector type the block vector is built on.

Accessing individual blocks, and resizing vectors

Apart from using this object as a whole, you can use each block separately as a vector, using the block() function. There is a single caveat: if you have changed the size of one or several blocks, you must call the function collect_sizes() of the block vector to update its internal structures.

Attention: Warning: If you change the sizes of single blocks without calling collect_sizes(), results may be unpredictable. The debug version does not check consistency here for performance reasons!

See also: Block (linear algebra)

Author: Wolfgang Bangerth, Guido Kanschat, 1999, 2000, 2001, 2002, 2004

Definition at line 42 of file block_vector_base.h.

Member Typedef Documentation

◆ BlockType

template<class VectorType>

typedef VectorType BlockVectorBase< VectorType >::BlockType

Typedef the type of the underlying vector.

Definition at line 520 of file block_vector_base.h.

◆ real_type

template<class VectorType>

typedef BlockType::real_type BlockVectorBase< VectorType >::real_type

Declare a type that has holds real-valued numbers with the same precision as the template argument to this class. If the template argument of this class is a real data type, then real_type equals the template argument. If the template argument is a std::complex type then real_type equals the type underlying the complex numbers.

This typedef is used to represent the return type of norms.

Definition at line 550 of file block_vector_base.h.

Constructor & Destructor Documentation

◆ BlockVectorBase() [1/3]

template<class VectorType>

BlockVectorBase< VectorType >::BlockVectorBase ( )

default

Default constructor.

◆ BlockVectorBase() [2/3]

template<class VectorType>

BlockVectorBase< VectorType >::BlockVectorBase ( const BlockVectorBase< VectorType > & )

default

Copy constructor.

◆ BlockVectorBase() [3/3]

template<class VectorType>

BlockVectorBase< VectorType >::BlockVectorBase ( BlockVectorBase< VectorType > && )

defaultnoexcept

Move constructor. Each block of the argument vector is moved into the current object if the underlying VectorType is move-constructible, otherwise they are copied.

Member Function Documentation

◆ collect_sizes()

template<class VectorType>

void BlockVectorBase< VectorType >::collect_sizes ( )

Update internal structures after resizing vectors. Whenever you reinited a block of a block vector, the internal data structures are corrupted. Therefore, you should call this function after all blocks got their new size.

◆ compress()

template<class VectorType>

void BlockVectorBase< VectorType >::compress ( ::VectorOperation::values operation )

Call the compress() function on all the subblocks of the matrix.

This functionality only needs to be called if using MPI based vectors and exists in other objects for compatibility.

See Compressing distributed objects for more information.

◆ block() [1/2]

template<class VectorType>

BlockType& BlockVectorBase< VectorType >::block ( const unsigned int i )

Access to a single block.

◆ block() [2/2]

template<class VectorType>

const BlockType& BlockVectorBase< VectorType >::block ( const unsigned int i ) const

Read-only access to a single block.

◆ get_block_indices()

template<class VectorType>

const BlockIndices& BlockVectorBase< VectorType >::get_block_indices ( ) const

Return a reference on the object that describes the mapping between block and global indices. The use of this function is highly deprecated and it should vanish in one of the next versions

◆ n_blocks()

template<class VectorType>

unsigned int BlockVectorBase< VectorType >::n_blocks ( ) const

Number of blocks.

◆ size()

template<class VectorType>

std::size_t BlockVectorBase< VectorType >::size ( ) const

Return dimension of the vector. This is the sum of the dimensions of all components.

◆ locally_owned_elements()

template<class VectorType>

IndexSet BlockVectorBase< VectorType >::locally_owned_elements ( ) const

Return an index set that describes which elements of this vector are owned by the current processor. Note that this index set does not include elements this vector may store locally as ghost elements but that are in fact owned by another processor. As a consequence, the index sets returned on different processors if this is a distributed vector will form disjoint sets that add up to the complete index set. Obviously, if a vector is created on only one processor, then the result would satisfy

vec.locally_owned_elements() == complete_index_set (vec.size())

For block vectors, this function returns the union of the locally owned elements of the individual blocks, shifted by their respective index offsets.

◆ begin() [1/2]

template<class VectorType>

iterator BlockVectorBase< VectorType >::begin ( )

Return an iterator pointing to the first element.

◆ begin() [2/2]

template<class VectorType>

const_iterator BlockVectorBase< VectorType >::begin ( ) const

Return an iterator pointing to the first element of a constant block vector.

◆ end() [1/2]

template<class VectorType>

iterator BlockVectorBase< VectorType >::end ( )

Return an iterator pointing to the element past the end.

◆ end() [2/2]

template<class VectorType>

const_iterator BlockVectorBase< VectorType >::end ( ) const

Return an iterator pointing to the element past the end of a constant block vector.

◆ operator()() [1/2]

template<class VectorType>

value_type BlockVectorBase< VectorType >::operator() ( const size_type i ) const

Access components, returns U(i).

◆ operator()() [2/2]

template<class VectorType>

reference BlockVectorBase< VectorType >::operator() ( const size_type i )

Access components, returns U(i) as a writeable reference.

◆ operator[]() [1/2]

template<class VectorType>

value_type BlockVectorBase< VectorType >::operator[] ( const size_type i ) const

Access components, returns U(i).

Exactly the same as operator().

◆ operator[]() [2/2]

template<class VectorType>

reference BlockVectorBase< VectorType >::operator[] ( const size_type i )

Access components, returns U(i) as a writeable reference.

Exactly the same as operator().

◆ extract_subvector_to() [1/2]

template<class VectorType>

template<typename OtherNumber >

void BlockVectorBase< VectorType >::extract_subvector_to	(	const std::vector< size_type > &	indices,
		std::vector< OtherNumber > &	values
	)		const

Instead of getting individual elements of a vector via operator(), this function allows getting a whole set of elements at once. The indices of the elements to be read are stated in the first argument, the corresponding values are returned in the second.

If the current vector is called v, then this function is the equivalent to the code

for (unsigned int i=0; i<indices.size(); ++i)

values[i] = v[indices[i]];

Precondition: The sizes of the indices and values arrays must be identical.

◆ extract_subvector_to() [2/2]

template<class VectorType>

template<typename ForwardIterator , typename OutputIterator >

void BlockVectorBase< VectorType >::extract_subvector_to	(	ForwardIterator	indices_begin,
		const ForwardIterator	indices_end,
		OutputIterator	values_begin
	)		const

Instead of getting individual elements of a vector via operator(), this function allows getting a whole set of elements at once. In contrast to the previous function, this function obtains the indices of the elements by dereferencing all elements of the iterator range provided by the first two arguments, and puts the vector values into memory locations obtained by dereferencing a range of iterators starting at the location pointed to by the third argument.

If the current vector is called v, then this function is the equivalent to the code

ForwardIterator indices_p = indices_begin;
OutputIterator  values_p  = values_begin;
while (indices_p != indices_end)
{
  *values_p = v[*indices_p];
  ++indices_p;
  ++values_p;
}

Precondition: It must be possible to write into as many memory locations starting at values_begin as there are iterators between indices_begin and indices_end.

◆ operator=() [1/5]

template<class VectorType>

BlockVectorBase& BlockVectorBase< VectorType >::operator= ( const value_type s )

Copy operator: fill all components of the vector with the given scalar value.

◆ operator=() [2/5]

template<class VectorType>

BlockVectorBase& BlockVectorBase< VectorType >::operator= ( const BlockVectorBase< VectorType > & V )

Copy operator for arguments of the same type.

◆ operator=() [3/5]

template<class VectorType>

BlockVectorBase& BlockVectorBase< VectorType >::operator= ( BlockVectorBase< VectorType > && )

default

Move assignment operator. Move each block of the given argument vector into the current object if VectorType is move-constructible, otherwise copy them.

◆ operator=() [4/5]

template<class VectorType>

template<class VectorType2 >

BlockVectorBase& BlockVectorBase< VectorType >::operator= ( const BlockVectorBase< VectorType2 > & V )

Copy operator for template arguments of different types.

◆ operator=() [5/5]

template<class VectorType>

BlockVectorBase& BlockVectorBase< VectorType >::operator= ( const VectorType & v )

Copy operator from non-block vectors to block vectors.

◆ operator==()

template<class VectorType>

template<class VectorType2 >

bool BlockVectorBase< VectorType >::operator== ( const BlockVectorBase< VectorType2 > & v ) const

Check for equality of two block vector types. This operation is only allowed if the two vectors already have the same block structure.

◆ operator*()

template<class VectorType>

value_type BlockVectorBase< VectorType >::operator* ( const BlockVectorBase< VectorType > & V ) const

\(U = U * V\): scalar product.

◆ norm_sqr()

template<class VectorType>

real_type BlockVectorBase< VectorType >::norm_sqr ( ) const

Return the square of the \(l_2\)-norm.

◆ mean_value()

template<class VectorType>

value_type BlockVectorBase< VectorType >::mean_value ( ) const

Return the mean value of the elements of this vector.

◆ l1_norm()

template<class VectorType>

real_type BlockVectorBase< VectorType >::l1_norm ( ) const

Return the \(l_1\)-norm of the vector, i.e. the sum of the absolute values.

◆ l2_norm()

template<class VectorType>

real_type BlockVectorBase< VectorType >::l2_norm ( ) const

Return the \(l_2\)-norm of the vector, i.e. the square root of the sum of the squares of the elements.

◆ linfty_norm()

template<class VectorType>

real_type BlockVectorBase< VectorType >::linfty_norm ( ) const

Return the maximum absolute value of the elements of this vector, which is the \(l_\infty\)-norm of a vector.

◆ add_and_dot()

template<class VectorType>

value_type BlockVectorBase< VectorType >::add_and_dot	(	const value_type	a,
		const BlockVectorBase< VectorType > &	V,
		const BlockVectorBase< VectorType > &	W
	)

Performs a combined operation of a vector addition and a subsequent inner product, returning the value of the inner product. In other words, the result of this function is the same as if the user called

this->add(a, V);

return_value = *this * W;

The reason this function exists is that this operation involves less memory transfer than calling the two functions separately on deal.II's vector classes (Vector<Number> and LinearAlgebra::distributed::Vector<double>). This method only needs to load three vectors, this, V, W, whereas calling separate methods means to load the calling vector this twice. Since most vector operations are memory transfer limited, this reduces the time by 25% (or 50% if W equals this).

For complex-valued vectors, the scalar product in the second step is implemented as \(\left<v,w\right>=\sum_i v_i \bar{w_i}\).

◆ in_local_range()

template<class VectorType>

bool BlockVectorBase< VectorType >::in_local_range ( const size_type global_index ) const

Return true if the given global index is in the local range of this processor. Asks the corresponding block.

◆ all_zero()

template<class VectorType>

bool BlockVectorBase< VectorType >::all_zero ( ) const

Return whether the vector contains only elements with value zero. This function is mainly for internal consistency check and should seldom be used when not in debug mode since it uses quite some time.

◆ is_non_negative()

template<class VectorType>

bool BlockVectorBase< VectorType >::is_non_negative ( ) const

Return true if the vector has no negative entries, i.e. all entries are zero or positive. This function is used, for example, to check whether refinement indicators are really all positive (or zero).

◆ operator+=()

template<class VectorType>

BlockVectorBase& BlockVectorBase< VectorType >::operator+= ( const BlockVectorBase< VectorType > & V )

Addition operator. Fast equivalent to U.add(1, V).

◆ operator-=()

template<class VectorType>

BlockVectorBase& BlockVectorBase< VectorType >::operator-= ( const BlockVectorBase< VectorType > & V )

Subtraction operator. Fast equivalent to U.add(-1, V).

◆ add() [1/6]

template<class VectorType>

template<typename Number >

void BlockVectorBase< VectorType >::add	(	const std::vector< size_type > &	indices,
		const std::vector< Number > &	values
	)

A collective add operation: This function adds a whole set of values stored in values to the vector components specified by indices.

◆ add() [2/6]

template<class VectorType>

template<typename Number >

void BlockVectorBase< VectorType >::add	(	const std::vector< size_type > &	indices,
		const Vector< Number > &	values
	)

This is a second collective add operation. As a difference, this function takes a deal.II vector of values.

◆ add() [3/6]

template<class VectorType>

template<typename Number >

void BlockVectorBase< VectorType >::add	(	const size_type	n_elements,
		const size_type *	indices,
		const Number *	values
	)

Take an address where n_elements are stored contiguously and add them into the vector. Handles all cases which are not covered by the other two add() functions above.

◆ add() [4/6]

template<class VectorType>

void BlockVectorBase< VectorType >::add ( const value_type s )

\(U(0-DIM)+=s\). Addition of s to all components. Note that s is a scalar and not a vector.

◆ add() [5/6]

template<class VectorType>

void BlockVectorBase< VectorType >::add	(	const value_type	a,
		const BlockVectorBase< VectorType > &	V
	)

U+=a*V. Simple addition of a scaled vector.

◆ add() [6/6]

template<class VectorType>

void BlockVectorBase< VectorType >::add	(	const value_type	a,
		const BlockVectorBase< VectorType > &	V,
		const value_type	b,
		const BlockVectorBase< VectorType > &	W
	)

U+=a*V+b*W. Multiple addition of scaled vectors.

◆ sadd() [1/4]

template<class VectorType>

void BlockVectorBase< VectorType >::sadd	(	const value_type	s,
		const BlockVectorBase< VectorType > &	V
	)

U=s*U+V. Scaling and simple vector addition.

◆ sadd() [2/4]

template<class VectorType>

void BlockVectorBase< VectorType >::sadd	(	const value_type	s,
		const value_type	a,
		const BlockVectorBase< VectorType > &	V
	)

U=s*U+a*V. Scaling and simple addition.

◆ sadd() [3/4]

template<class VectorType>

void BlockVectorBase< VectorType >::sadd	(	const value_type	s,
		const value_type	a,
		const BlockVectorBase< VectorType > &	V,
		const value_type	b,
		const BlockVectorBase< VectorType > &	W
	)

U=s*U+a*V+b*W. Scaling and multiple addition.

◆ sadd() [4/4]

template<class VectorType>

void BlockVectorBase< VectorType >::sadd	(	const value_type	s,
		const value_type	a,
		const BlockVectorBase< VectorType > &	V,
		const value_type	b,
		const BlockVectorBase< VectorType > &	W,
		const value_type	c,
		const BlockVectorBase< VectorType > &	X
	)

U=s*U+a*V+b*W+c*X. Scaling and multiple addition.

◆ operator*=()

template<class VectorType>

BlockVectorBase& BlockVectorBase< VectorType >::operator*= ( const value_type factor )

Scale each element of the vector by a constant value.

◆ operator/=()

template<class VectorType>

BlockVectorBase& BlockVectorBase< VectorType >::operator/= ( const value_type factor )

Scale each element of the vector by the inverse of the given value.

◆ scale()

template<class VectorType>

template<class BlockVector2 >

void BlockVectorBase< VectorType >::scale ( const BlockVector2 & v )

Multiply each element of this vector by the corresponding element of v.

◆ equ() [1/2]

template<class VectorType>

template<class BlockVector2 >

void BlockVectorBase< VectorType >::equ	(	const value_type	a,
		const BlockVector2 &	V
	)

U=a*V. Assignment.

◆ equ() [2/2]

template<class VectorType>

void BlockVectorBase< VectorType >::equ	(	const value_type	a,
		const BlockVectorBase< VectorType > &	V,
		const value_type	b,
		const BlockVectorBase< VectorType > &	W
	)

U=a*V+b*W. Replacing by sum.

◆ update_ghost_values()

template<class VectorType>

void BlockVectorBase< VectorType >::update_ghost_values ( ) const

Update the ghost values by calling update_ghost_values for each block.

◆ memory_consumption()

template<class VectorType>

std::size_t BlockVectorBase< VectorType >::memory_consumption ( ) const

Determine an estimate for the memory consumption (in bytes) of this object.

Friends And Related Function Documentation

◆ ::internal::BlockVectorIterators::Iterator

template<class VectorType>

template<typename N , bool C>

friend class ::internal::BlockVectorIterators::Iterator

friend

Make the iterator class a friend.

Definition at line 990 of file block_vector_base.h.

Member Data Documentation

◆ components

template<class VectorType>

std::vector<VectorType> BlockVectorBase< VectorType >::components

protected

Pointer to the array of components.

Definition at line 978 of file block_vector_base.h.

◆ block_indices

template<class VectorType>

BlockIndices BlockVectorBase< VectorType >::block_indices

protected

Object managing the transformation between global indices and indices within the different blocks.

Definition at line 984 of file block_vector_base.h.

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

deal.II/lac/block_vector_base.h

Public Types

Public Member Functions

Protected Attributes

Friends

Additional Inherited Members

Detailed Description

template<class VectorType> class BlockVectorBase< VectorType >

Accessing individual blocks, and resizing vectors

Member Typedef Documentation

◆ BlockType

◆ real_type

Constructor & Destructor Documentation

◆ BlockVectorBase() [1/3]

◆ BlockVectorBase() [2/3]

◆ BlockVectorBase() [3/3]

Member Function Documentation

◆ collect_sizes()

◆ compress()

◆ block() [1/2]

◆ block() [2/2]

◆ get_block_indices()

◆ n_blocks()

◆ size()

◆ locally_owned_elements()

◆ begin() [1/2]

◆ begin() [2/2]

◆ end() [1/2]

◆ end() [2/2]

◆ operator()() [1/2]

◆ operator()() [2/2]

◆ operator[]() [1/2]

◆ operator[]() [2/2]

◆ extract_subvector_to() [1/2]

◆ extract_subvector_to() [2/2]

◆ operator=() [1/5]

◆ operator=() [2/5]

◆ operator=() [3/5]

◆ operator=() [4/5]

◆ operator=() [5/5]

◆ operator==()

◆ operator*()

◆ norm_sqr()

◆ mean_value()

◆ l1_norm()

◆ l2_norm()

◆ linfty_norm()

◆ add_and_dot()

◆ in_local_range()

◆ all_zero()

◆ is_non_negative()

◆ operator+=()

◆ operator-=()

◆ add() [1/6]

◆ add() [2/6]

◆ add() [3/6]

◆ add() [4/6]

◆ add() [5/6]

◆ add() [6/6]

◆ sadd() [1/4]

◆ sadd() [2/4]

◆ sadd() [3/4]

◆ sadd() [4/4]

◆ operator*=()

◆ operator/=()

◆ scale()

◆ equ() [1/2]

◆ equ() [2/2]

◆ update_ghost_values()

◆ memory_consumption()

Friends And Related Function Documentation

◆ ::internal::BlockVectorIterators::Iterator

Member Data Documentation

◆ components

◆ block_indices

template<class VectorType>
class BlockVectorBase< VectorType >