MFEM  v4.0
Finite element discretization library
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mfem::BlockVector Class Reference

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

#include <blockvector.hpp>

Inheritance diagram for mfem::BlockVector:
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Collaboration diagram for mfem::BlockVector:
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Public Member Functions

 BlockVector ()
 empty constructor More...
 
 BlockVector (const Array< int > &bOffsets)
 Constructor. More...
 
 BlockVector (const Array< int > &bOffsets, MemoryType mt)
 Construct a BlockVector with the given MemoryType mt. More...
 
 BlockVector (const BlockVector &block)
 Copy constructor. More...
 
 BlockVector (double *data, const Array< int > &bOffsets)
 View constructor. More...
 
BlockVectoroperator= (const BlockVector &original)
 Assignment operator. this and original must have the same block structure. More...
 
BlockVectoroperator= (double val)
 Set each entry of this equal to val. More...
 
 ~BlockVector ()
 Destructor. More...
 
VectorGetBlock (int i)
 Get the i-th vector in the block. More...
 
const VectorGetBlock (int i) const
 Get the i-th vector in the block (const version). More...
 
void GetBlockView (int i, Vector &blockView)
 Get the i-th vector in the block. More...
 
int BlockSize (int i)
 
void Update (double *data, const Array< int > &bOffsets)
 Update method. More...
 
void Update (const Array< int > &bOffsets)
 Update a BlockVector with new bOffsets and make sure it owns its data. More...
 
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. More...
 
- Public Member Functions inherited from mfem::Vector
 Vector ()
 Default constructor for Vector. Sets size = 0 and data = NULL. More...
 
 Vector (const Vector &)
 Copy constructor. Allocates a new data array and copies the data. More...
 
 Vector (int s)
 Creates vector of size s. More...
 
 Vector (double *_data, int _size)
 Creates a vector referencing an array of doubles, owned by someone else. More...
 
 Vector (int size_, MemoryType mt)
 Create a Vector of size size_ using MemoryType mt. More...
 
void UseDevice (bool use_dev) const
 Enable execution of Vector operations using the mfem::Device. More...
 
bool UseDevice () const
 Return the device flag of the Memory object used by the Vector. More...
 
void Load (std::istream **in, int np, int *dim)
 Reads a vector from multiple files. More...
 
void Load (std::istream &in, int Size)
 Load a vector from an input stream. More...
 
void Load (std::istream &in)
 Load a vector from an input stream, reading the size from the stream. More...
 
void SetSize (int s)
 Resize the vector to size s. More...
 
void SetSize (int s, MemoryType mt)
 Resize the vector to size s using MemoryType mt. More...
 
void SetSize (int s, Vector &v)
 Resize the vector to size s using the MemoryType of v. More...
 
void SetData (double *d)
 
void SetDataAndSize (double *d, int s)
 Set the Vector data and size. More...
 
void NewDataAndSize (double *d, int s)
 Set the Vector data and size, deleting the old data, if owned. More...
 
void NewMemoryAndSize (const Memory< double > &mem, int s, bool own_mem)
 Reset the Vector to use the given external Memory mem and size s. More...
 
void MakeDataOwner () const
 Set the Vector data (host pointer) ownership flag. More...
 
void Destroy ()
 Destroy a vector. More...
 
int Size () const
 Returns the size of the vector. More...
 
int Capacity () const
 Return the size of the currently allocated data array. More...
 
double * GetData () const
 Return a pointer to the beginning of the Vector data. More...
 
 operator double * ()
 Conversion to double *. More...
 
 operator const double * () const
 Conversion to const double *. More...
 
Memory< double > & GetMemory ()
 Return a reference to the Memory object used by the Vector. More...
 
const Memory< double > & GetMemory () const
 Return a reference to the Memory object used by the Vector, const version. More...
 
void SyncMemory (const Vector &v)
 Update the memory location of the vector to match v. More...
 
void SyncAliasMemory (const Vector &v)
 Update the alias memory location of the vector to match v. More...
 
bool OwnsData () const
 Read the Vector data (host pointer) ownership flag. More...
 
void StealData (double **p)
 Changes the ownership of the data; after the call the Vector is empty. More...
 
double * StealData ()
 Changes the ownership of the data; after the call the Vector is empty. More...
 
double & Elem (int i)
 Access Vector entries. Index i = 0 .. size-1. More...
 
const double & Elem (int i) const
 Read only access to Vector entries. Index i = 0 .. size-1. More...
 
double & operator() (int i)
 Access Vector entries using () for 0-based indexing. More...
 
const double & operator() (int i) const
 Read only access to Vector entries using () for 0-based indexing. More...
 
double operator* (const double *) const
 Dot product with a double * array. More...
 
double operator* (const Vector &v) const
 Return the inner-product. More...
 
Vectoroperator= (const double *v)
 Copy Size() entries from v. More...
 
Vectoroperator= (const Vector &v)
 Copy assignment. More...
 
Vectoroperator= (double value)
 Redefine '=' for vector = constant. More...
 
Vectoroperator*= (double c)
 
Vectoroperator/= (double c)
 
Vectoroperator-= (double c)
 
Vectoroperator-= (const Vector &v)
 
Vectoroperator+= (const Vector &v)
 
VectorAdd (const double a, const Vector &Va)
 (*this) += a * Va More...
 
VectorSet (const double a, const Vector &x)
 (*this) = a * x More...
 
void SetVector (const Vector &v, int offset)
 
void Neg ()
 (*this) = -(*this) More...
 
void Swap (Vector &other)
 Swap the contents of two Vectors. More...
 
void median (const Vector &lo, const Vector &hi)
 v = median(v,lo,hi) entrywise. Implementation assumes lo <= hi. More...
 
void GetSubVector (const Array< int > &dofs, Vector &elemvect) const
 
void GetSubVector (const Array< int > &dofs, double *elem_data) const
 
void SetSubVector (const Array< int > &dofs, const double value)
 Set the entries listed in dofs to the given value. More...
 
void SetSubVector (const Array< int > &dofs, const Vector &elemvect)
 
void SetSubVector (const Array< int > &dofs, double *elem_data)
 
void AddElementVector (const Array< int > &dofs, const Vector &elemvect)
 Add (element) subvector to the vector. More...
 
void AddElementVector (const Array< int > &dofs, double *elem_data)
 
void AddElementVector (const Array< int > &dofs, const double a, const Vector &elemvect)
 
void SetSubVectorComplement (const Array< int > &dofs, const double val)
 Set all vector entries NOT in the 'dofs' array to the given 'val'. More...
 
void Print (std::ostream &out=mfem::out, int width=8) const
 Prints vector to stream out. More...
 
void Print_HYPRE (std::ostream &out) const
 Prints vector to stream out in HYPRE_Vector format. More...
 
void Randomize (int seed=0)
 Set random values in the vector. More...
 
double Norml2 () const
 Returns the l2 norm of the vector. More...
 
double Normlinf () const
 Returns the l_infinity norm of the vector. More...
 
double Norml1 () const
 Returns the l_1 norm of the vector. More...
 
double Normlp (double p) const
 Returns the l_p norm of the vector. More...
 
double Max () const
 Returns the maximal element of the vector. More...
 
double Min () const
 Returns the minimal element of the vector. More...
 
double Sum () const
 Return the sum of the vector entries. More...
 
double DistanceSquaredTo (const double *p) const
 Compute the square of the Euclidean distance to another vector. More...
 
double DistanceTo (const double *p) const
 Compute the Euclidean distance to another vector. More...
 
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. More...
 
virtual ~Vector ()
 Destroys vector. More...
 
const double * Read (bool on_dev=true) const
 Shortcut for mfem::Read(vec.GetMemory(), vec.Size(), on_dev). More...
 
const double * HostRead () const
 Shortcut for mfem::Read(vec.GetMemory(), vec.Size(), false). More...
 
double * Write (bool on_dev=true)
 Shortcut for mfem::Write(vec.GetMemory(), vec.Size(), on_dev). More...
 
double * HostWrite ()
 Shortcut for mfem::Write(vec.GetMemory(), vec.Size(), false). More...
 
double * ReadWrite (bool on_dev=true)
 Shortcut for mfem::ReadWrite(vec.GetMemory(), vec.Size(), on_dev). More...
 
double * HostReadWrite ()
 Shortcut for mfem::ReadWrite(vec.GetMemory(), vec.Size(), false). More...
 
 Vector (N_Vector nv)
 Construct a wrapper Vector from SUNDIALS N_Vector. More...
 
virtual N_Vector ToNVector ()
 Return a new wrapper SUNDIALS N_Vector of type SUNDIALS_NVEC_SERIAL. More...
 
virtual void ToNVector (N_Vector &nv)
 Update an existing wrapper SUNDIALS N_Vector to point to this Vector. More...
 

Protected Member Functions

void SetBlocks ()
 

Protected Attributes

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

mfem::BlockVector::BlockVector ( )

empty constructor

Definition at line 29 of file blockvector.cpp.

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 39 of file blockvector.cpp.

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

Construct a BlockVector with the given MemoryType mt.

Definition at line 48 of file blockvector.cpp.

mfem::BlockVector::BlockVector ( const BlockVector block)

Copy constructor.

Definition at line 58 of file blockvector.cpp.

mfem::BlockVector::BlockVector ( double *  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 68 of file blockvector.cpp.

mfem::BlockVector::~BlockVector ( )

Destructor.

Definition at line 157 of file blockvector.cpp.

Member Function Documentation

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

Definition at line 91 of file blockvector.hpp.

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

Get the i-th vector in the block.

Definition at line 84 of file blockvector.hpp.

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

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

Definition at line 86 of file blockvector.hpp.

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

Get the i-th vector in the block.

Definition at line 162 of file blockvector.cpp.

BlockVector & mfem::BlockVector::operator= ( const BlockVector original)

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

Definition at line 130 of file blockvector.cpp.

BlockVector & mfem::BlockVector::operator= ( double  val)

Set each entry of this equal to val.

Definition at line 150 of file blockvector.cpp.

void mfem::BlockVector::SetBlocks ( )
protected

Definition at line 19 of file blockvector.cpp.

void mfem::BlockVector::Update ( double *  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 77 of file blockvector.cpp.

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 90 of file blockvector.cpp.

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 95 of file blockvector.cpp.

Member Data Documentation

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.

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.

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: