mfem::BlockVector Class Reference

A class to handle Vectors in a block fashion. More...

#include <blockvector.hpp>

Inheritance diagram for mfem::BlockVector:

Collaboration diagram for mfem::BlockVector:

Public Member Functions
	BlockVector ()
	empty constructor
	BlockVector (const Array< int > &bOffsets)
	Constructor.
	BlockVector (const Array< int > &bOffsets, MemoryType mt)
	Construct a BlockVector with the given MemoryType mt.
	BlockVector (const BlockVector &block)
	Copy constructor.
	BlockVector (real_t *data, const Array< int > &bOffsets)
	View constructor.
	BlockVector (Vector &v, const Array< int > &bOffsets)
	Wrap a Vector as a BlockVector.
	BlockVector (Vector &v, int offset, const Array< int > &bOffsets)
	Wrap a Vector as a BlockVector with offset.
int	NumBlocks () const
	Return the number of blocks.
BlockVector &	operator= (const BlockVector &original)
	Assignment operator. this and original must have the same block structure.
BlockVector &	operator= (real_t val)
	Set each entry of this equal to val.
	~BlockVector ()
	Destructor.
Vector &	GetBlock (int i)
	Get the i-th vector in the block.
const Vector &	GetBlock (int i) const
	Get the i-th vector in the block (const version).
void	GetBlockView (int i, Vector &blockView)
	Get the i-th vector in the block.
int	BlockSize (int i)
void	Update (real_t *data, const Array< int > &bOffsets)
	Update method.
void	Update (Vector &data, const Array< int > &bOffsets)
void	Update (const Array< int > &bOffsets)
	Update a BlockVector with new bOffsets and make sure it owns its data.
void	Update (const Array< int > &bOffsets, MemoryType mt)
	Update a BlockVector with new bOffsets and make sure it owns its data and uses the MemoryType mt.
void	SyncToBlocks () const
	Synchronize the memory location flags (i.e. the memory validity flags) of the big/monolithic block-vector with its sub-vector blocks. The big/monolithic vector has the correct memory location flags.
void	SyncFromBlocks () const
	Synchronize the memory location flags (i.e. the memory validity flags) of the big/monolithic block-vector with its sub-vector blocks. The sub-vector blocks have the correct memory location flags.
Public Member Functions inherited from mfem::Vector
	Vector ()
	Vector (const Vector &)
	Copy constructor. Allocates a new data array and copies the data.
	Vector (Vector &&v)
	Move constructor. "Steals" data from its argument.
	Vector (int s)
	Creates vector of size s.
	Vector (real_t *data_, int size_)
	Creates a vector referencing an array of doubles, owned by someone else.
	Vector (Vector &base, int base_offset, int size_)
	Create a Vector referencing a sub-vector of the Vector base starting at the given offset, base_offset, and size size_.
	Vector (int size_, MemoryType mt)
	Create a Vector of size size_ using MemoryType mt.
	Vector (int size_, MemoryType h_mt, MemoryType d_mt)
	Create a Vector of size size_ using host MemoryType h_mt and device MemoryType d_mt.
template<int N, typename T = real_t>
	Vector (const T(&values)[N])
	Create a vector using a braced initializer list.
virtual void	UseDevice (bool use_dev) const
	Enable execution of Vector operations using the mfem::Device.
virtual bool	UseDevice () const
	Return the device flag of the Memory object used by the Vector.
void	Load (std::istream **in, int np, int *dim)
	Reads a vector from multiple files.
void	Load (std::istream &in, int Size)
	Load a vector from an input stream.
void	Load (std::istream &in)
	Load a vector from an input stream, reading the size from the stream.
void	SetSize (int s)
	Resize the vector to size s.
void	SetSize (int s, MemoryType mt)
	Resize the vector to size s using MemoryType mt.
void	SetSize (int s, const Vector &v)
	Resize the vector to size s using the MemoryType of v.
void	SetData (real_t *d)
void	SetDataAndSize (real_t *d, int s)
	Set the Vector data and size.
void	NewDataAndSize (real_t *d, int s)
	Set the Vector data and size, deleting the old data, if owned.
void	NewMemoryAndSize (const Memory< real_t > &mem, int s, bool own_mem)
	Reset the Vector to use the given external Memory mem and size s.
void	MakeRef (Vector &base, int offset, int size)
	Reset the Vector to be a reference to a sub-vector of base.
void	MakeRef (Vector &base, int offset)
	Reset the Vector to be a reference to a sub-vector of base without changing its current size.
void	MakeDataOwner () const
	Set the Vector data (host pointer) ownership flag.
void	Destroy ()
	Destroy a vector.
void	DeleteDevice (bool copy_to_host=true)
	Delete the device pointer, if owned. If copy_to_host is true and the data is valid only on device, move it to host before deleting. Invalidates the device memory.
int	Size () const
	Returns the size of the vector.
int	Capacity () const
	Return the size of the currently allocated data array.
real_t *	GetData () const
	Return a pointer to the beginning of the Vector data.
MFEM_DEPRECATED	operator real_t * ()
	Conversion to double *. Deprecated.
MFEM_DEPRECATED	operator const real_t * () const
	Conversion to const double *. Deprecated.
real_t *	begin ()
	STL-like begin.
real_t *	end ()
	STL-like end.
const real_t *	begin () const
	STL-like begin (const version).
const real_t *	end () const
	STL-like end (const version).
Memory< real_t > &	GetMemory ()
	Return a reference to the Memory object used by the Vector.
const Memory< real_t > &	GetMemory () const
	Return a reference to the Memory object used by the Vector, const version.
void	SyncMemory (const Vector &v) const
	Update the memory location of the vector to match v.
void	SyncAliasMemory (const Vector &v) const
	Update the alias memory location of the vector to match v.
bool	OwnsData () const
	Read the Vector data (host pointer) ownership flag.
void	StealData (real_t **p)
	Changes the ownership of the data; after the call the Vector is empty.
real_t *	StealData ()
	Changes the ownership of the data; after the call the Vector is empty.
real_t &	Elem (int i)
	Access Vector entries. Index i = 0 .. size-1.
const real_t &	Elem (int i) const
	Read only access to Vector entries. Index i = 0 .. size-1.
real_t &	operator() (int i)
	Access Vector entries using () for 0-based indexing.
const real_t &	operator() (int i) const
	Read only access to Vector entries using () for 0-based indexing.
real_t &	operator[] (int i)
	Access Vector entries using [] for 0-based indexing.
const real_t &	operator[] (int i) const
	Read only access to Vector entries using [] for 0-based indexing.
real_t	operator* (const real_t *) const
	Dot product with a double * array.
real_t	operator* (const Vector &v) const
	Return the inner-product.
Vector &	operator= (const real_t *v)
	Copy Size() entries from v.
Vector &	operator= (const Vector &v)
	Copy assignment.
Vector &	operator= (Vector &&v)
	Move assignment.
Vector &	operator= (real_t value)
	Redefine '=' for vector = constant.
Vector &	operator*= (real_t c)
Vector &	operator*= (const Vector &v)
	Component-wise scaling: (*this)(i) *= v(i)
Vector &	operator/= (real_t c)
Vector &	operator/= (const Vector &v)
	Component-wise division: (*this)(i) /= v(i)
Vector &	operator-= (real_t c)
Vector &	operator-= (const Vector &v)
Vector &	operator+= (real_t c)
Vector &	operator+= (const Vector &v)
Vector &	Add (const real_t a, const Vector &Va)
	(*this) += a * Va
Vector &	Set (const real_t a, const Vector &x)
	(*this) = a * x
void	SetVector (const Vector &v, int offset)
void	AddSubVector (const Vector &v, int offset)
void	Neg ()
	(*this) = -(*this)
void	Reciprocal ()
	(*this)(i) = 1.0 / (*this)(i)
void	Swap (Vector &other)
	Swap the contents of two Vectors.
void	cross3D (const Vector &vin, Vector &vout) const
void	median (const Vector &lo, const Vector &hi)
	v = median(v,lo,hi) entrywise. Implementation assumes lo <= hi.
void	GetSubVector (const Array< int > &dofs, Vector &elemvect) const
	Extract entries listed in dofs to the output Vector elemvect.
void	GetSubVector (const Array< int > &dofs, real_t *elem_data) const
	Extract entries listed in dofs to the output array elem_data.
void	SetSubVector (const Array< int > &dofs, const real_t value)
	Set the entries listed in dofs to the given value.
void	SetSubVector (const Array< int > &dofs, const Vector &elemvect)
	Set the entries listed in dofs to the values given in the elemvect Vector. Negative dof values cause the -dof-1 position in this Vector to receive the -val from elemvect.
void	SetSubVector (const Array< int > &dofs, real_t *elem_data)
	Set the entries listed in dofs to the values given the , elem_data array. Negative dof values cause the -dof-1 position in this Vector to receive the -val from elem_data.
void	AddElementVector (const Array< int > &dofs, const Vector &elemvect)
	Add elements of the elemvect Vector to the entries listed in dofs. Negative dof values cause the -dof-1 position in this Vector to add the -val from elemvect.
void	AddElementVector (const Array< int > &dofs, real_t *elem_data)
	Add elements of the elem_data array to the entries listed in dofs. Negative dof values cause the -dof-1 position in this Vector to add the -val from elem_data.
void	AddElementVector (const Array< int > &dofs, const real_t a, const Vector &elemvect)
	Add times the elements of the elemvect Vector to the entries listed in dofs. Negative dof values cause the -dof-1 position in this Vector to add the -a*val from elemvect.
void	SetSubVectorComplement (const Array< int > &dofs, const real_t val)
	Set all vector entries NOT in the dofs Array to the given val.
void	Print (std::ostream &out=mfem::out, int width=8) const
	Prints vector to stream out.
void	Print (adios2stream &out, const std::string &variable_name) const
void	Print_HYPRE (std::ostream &out) const
	Prints vector to stream out in HYPRE_Vector format.
void	PrintHash (std::ostream &out) const
	Print the Vector size and hash of its data.
void	Randomize (int seed=0)
	Set random values in the vector.
real_t	Norml2 () const
	Returns the l2 norm of the vector.
real_t	Normlinf () const
	Returns the l_infinity norm of the vector.
real_t	Norml1 () const
	Returns the l_1 norm of the vector.
real_t	Normlp (real_t p) const
	Returns the l_p norm of the vector.
real_t	Max () const
	Returns the maximal element of the vector.
real_t	Min () const
	Returns the minimal element of the vector.
real_t	Sum () const
	Return the sum of the vector entries.
real_t	DistanceSquaredTo (const real_t *p) const
	Compute the square of the Euclidean distance to another vector.
real_t	DistanceSquaredTo (const Vector &p) const
	Compute the square of the Euclidean distance to another vector.
real_t	DistanceTo (const real_t *p) const
	Compute the Euclidean distance to another vector.
real_t	DistanceTo (const Vector &p) const
	Compute the Euclidean distance to another vector.
int	CheckFinite () const
	Count the number of entries in the Vector for which isfinite is false, i.e. the entry is a NaN or +/-Inf.
virtual	~Vector ()
	Destroys vector.
virtual const real_t *	Read (bool on_dev=true) const
	Shortcut for mfem::Read(vec.GetMemory(), vec.Size(), on_dev).
virtual const real_t *	HostRead () const
	Shortcut for mfem::Read(vec.GetMemory(), vec.Size(), false).
virtual real_t *	Write (bool on_dev=true)
	Shortcut for mfem::Write(vec.GetMemory(), vec.Size(), on_dev).
virtual real_t *	HostWrite ()
	Shortcut for mfem::Write(vec.GetMemory(), vec.Size(), false).
virtual real_t *	ReadWrite (bool on_dev=true)
	Shortcut for mfem::ReadWrite(vec.GetMemory(), vec.Size(), on_dev).
virtual real_t *	HostReadWrite ()
	Shortcut for mfem::ReadWrite(vec.GetMemory(), vec.Size(), false).

Protected Member Functions
void	SetBlocks ()

Protected Attributes
int	numBlocks
	Number of blocks in the blockVector.
const int *	blockOffsets
	Offset for each block start. (length numBlocks+1)
Vector *	blocks
	array of Vector objects used to extract blocks without allocating memory.
Protected Attributes inherited from mfem::Vector
Memory< real_t >	data
int	size

Detailed Description

A class to handle Vectors in a block fashion.

All data is contained in Vector::data, while blockVector is just a viewer for this data.

Definition at line 30 of file blockvector.hpp.

Constructor & Destructor Documentation

BlockVector() [1/7]

mfem::BlockVector::BlockVector

(

)

empty constructor

Definition at line 27 of file blockvector.cpp.

BlockVector() [2/7]

mfem::BlockVector::BlockVector

(

const Array< int > &

bOffsets

)

Constructor.

Standard constructor.

bOffsets is an array of integers (length nBlocks+1) that tells the offsets of each block start.

Definition at line 37 of file blockvector.cpp.

BlockVector() [3/7]

mfem::BlockVector::BlockVector	(	const Array< int > &	bOffsets,
		MemoryType	mt )

Construct a BlockVector with the given MemoryType mt.

Definition at line 46 of file blockvector.cpp.

BlockVector() [4/7]

mfem::BlockVector::BlockVector

(

const BlockVector &

block

)

Copy constructor.

Definition at line 56 of file blockvector.cpp.

BlockVector() [5/7]

mfem::BlockVector::BlockVector	(	real_t *	data,
		const Array< int > &	bOffsets )

View constructor.

data is an array of double of length at least blockOffsets[numBlocks] that contain all the values of the monolithic vector. bOffsets is an array of integers (length nBlocks+1) that tells the offsets of each block start. nBlocks is the number of blocks.

Definition at line 66 of file blockvector.cpp.

BlockVector() [6/7]

mfem::BlockVector::BlockVector	(	Vector &	v,
		const Array< int > &	bOffsets )

Wrap a Vector as a BlockVector.

Definition at line 75 of file blockvector.cpp.

BlockVector() [7/7]

mfem::BlockVector::BlockVector	(	Vector &	v,
		int	offset,
		const Array< int > &	bOffsets )

Wrap a Vector as a BlockVector with offset.

Definition at line 85 of file blockvector.cpp.

~BlockVector()

mfem::BlockVector::~BlockVector

(

)

Destructor.

Definition at line 192 of file blockvector.cpp.

Member Function Documentation

BlockSize()

int mfem::BlockVector::BlockSize ( int i )

inline

Definition at line 100 of file blockvector.hpp.

GetBlock() [1/2]

Vector & mfem::BlockVector::GetBlock ( int i )

inline

Get the i-th vector in the block.

Definition at line 93 of file blockvector.hpp.

GetBlock() [2/2]

const Vector & mfem::BlockVector::GetBlock ( int i ) const

inline

Get the i-th vector in the block (const version).

Definition at line 95 of file blockvector.hpp.

GetBlockView()

void mfem::BlockVector::GetBlockView	(	int	i,
		Vector &	blockView )

Get the i-th vector in the block.

Definition at line 197 of file blockvector.cpp.

NumBlocks()

int mfem::BlockVector::NumBlocks ( ) const

inline

Return the number of blocks.

Definition at line 82 of file blockvector.hpp.

operator=() [1/2]

BlockVector & mfem::BlockVector::operator=

(

const BlockVector &

original

)

Assignment operator. this and original must have the same block structure.

Definition at line 165 of file blockvector.cpp.

operator=() [2/2]

BlockVector & mfem::BlockVector::operator=

(

real_t

val

)

Set each entry of this equal to val.

Definition at line 185 of file blockvector.cpp.

SetBlocks()

void mfem::BlockVector::SetBlocks ( )

protected

Definition at line 19 of file blockvector.cpp.

SyncFromBlocks()

void mfem::BlockVector::SyncFromBlocks

(

)

const

Synchronize the memory location flags (i.e. the memory validity flags) of the big/monolithic block-vector with its sub-vector blocks. The sub-vector blocks have the correct memory location flags.

This method will copy/move the data of the sub-vector blocks (if necessary) so that each block matches the memory location flags of the big/monolithic block-vector.

Definition at line 210 of file blockvector.cpp.

SyncToBlocks()

void mfem::BlockVector::SyncToBlocks

(

)

const

Synchronize the memory location flags (i.e. the memory validity flags) of the big/monolithic block-vector with its sub-vector blocks. The big/monolithic vector has the correct memory location flags.

This method will copy the data validity flags from the big/monolithic block-vector to its sub-vector block.

Definition at line 202 of file blockvector.cpp.

Update() [1/4]

void mfem::BlockVector::Update

(

const Array< int > &

bOffsets

)

Update a BlockVector with new bOffsets and make sure it owns its data.

The block-vector will be re-allocated if either:

• the offsets bOffsets are different from the current offsets, or
• currently, the block-vector does not own its data.

Definition at line 125 of file blockvector.cpp.

Update() [2/4]

void mfem::BlockVector::Update	(	const Array< int > &	bOffsets,
		MemoryType	mt )

Update a BlockVector with new bOffsets and make sure it owns its data and uses the MemoryType mt.

The block-vector will be re-allocated if either:

• the offsets bOffsets are different from the current offsets, or
• currently, the block-vector does not own its data, or
• currently, the block-vector does not use MemoryType mt.

Definition at line 130 of file blockvector.cpp.

Update() [3/4]

void mfem::BlockVector::Update	(	real_t *	data,
		const Array< int > &	bOffsets )

Update method.

data is an array of double of length at least blockOffsets[numBlocks] that contain all the values of the monolithic vector. bOffsets is an array of integers (length nBlocks+1) that tells the offsets of each block start. nBlocks is the number of blocks.

Definition at line 95 of file blockvector.cpp.

Update() [4/4]

void mfem::BlockVector::Update	(	Vector &	data,
		const Array< int > &	bOffsets )

Definition at line 108 of file blockvector.cpp.

Member Data Documentation

blockOffsets

const int* mfem::BlockVector::blockOffsets

protected

Offset for each block start. (length numBlocks+1)

blockOffsets[i+1] - blockOffsets[i] is the size of block i.

This array is not owned.

Definition at line 42 of file blockvector.hpp.

blocks

Vector* mfem::BlockVector::blocks

protected

array of Vector objects used to extract blocks without allocating memory.

This array is owned.

Definition at line 45 of file blockvector.hpp.

numBlocks

int mfem::BlockVector::numBlocks

protected

Number of blocks in the blockVector.

Definition at line 35 of file blockvector.hpp.

---

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

• linalg/blockvector.hpp
• linalg/blockvector.cpp