mfem::Vector Class Reference

Vector data type. More...

#include <vector.hpp>

Inheritance diagram for mfem::Vector:

Collaboration diagram for mfem::Vector:

Public Member Functions
	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	MakeRef (Vector &base, int offset, int size)
	Reset the Vector to be a reference to a sub-vector of base. More...
void	MakeRef (Vector &base, int offset)
	Reset the Vector to be a reference to a sub-vector of base without changing its current size. 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...
Vector &	operator= (const double *v)
	Copy Size() entries from v. More...
Vector &	operator= (const Vector &v)
	Copy assignment. More...
Vector &	operator= (double value)
	Redefine '=' for vector = constant. More...
Vector &	operator*= (double c)
Vector &	operator/= (double c)
Vector &	operator-= (double c)
Vector &	operator-= (const Vector &v)
Vector &	operator+= (double c)
Vector &	operator+= (const Vector &v)
Vector &	Add (const double a, const Vector &Va)
	(*this) += a * Va More...
Vector &	Set (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
	Extract entries listed in dofs to the output Vector elemvect. More...
void	GetSubVector (const Array< int > &dofs, double *elem_data) const
	Extract entries listed in dofs to the output array elem_data. More...
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)
	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. More...
void	SetSubVector (const Array< int > &dofs, double *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. More...
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. More...
void	AddElementVector (const Array< int > &dofs, double *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. More...
void	AddElementVector (const Array< int > &dofs, const double 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. More...
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 (adios2stream &out, const std::string &variable_name) const
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...
MFEM_DEPRECATED	Vector (N_Vector nv)
	(DEPRECATED) Construct a wrapper Vector from SUNDIALS N_Vector. More...
virtual MFEM_DEPRECATED N_Vector	ToNVector ()
	(DEPRECATED) Return a new wrapper SUNDIALS N_Vector of type SUNDIALS_NVEC_SERIAL. More...
virtual MFEM_DEPRECATED void	ToNVector (N_Vector &nv, long global_length=0)
	Update an existing wrapper SUNDIALS N_Vector to point to this Vector. More...

Protected Attributes
Memory< double >	data
int	size

Friends
void	add (const Vector &v1, const Vector &v2, Vector &v)
	Set v = v1 + v2. More...
void	add (const Vector &v1, double alpha, const Vector &v2, Vector &v)
	Set v = v1 + alpha * v2. More...
void	add (const double a, const Vector &x, const Vector &y, Vector &z)
	z = a * (x + y) More...
void	add (const double a, const Vector &x, const double b, const Vector &y, Vector &z)
	z = a * x + b * y More...
void	subtract (const Vector &v1, const Vector &v2, Vector &v)
	Set v = v1 - v2. More...
void	subtract (const double a, const Vector &x, const Vector &y, Vector &z)
	z = a * (x - y) More...

Detailed Description

Vector data type.

Definition at line 51 of file vector.hpp.

Constructor & Destructor Documentation

mfem::Vector::Vector ( )

inline

Default constructor for Vector. Sets size = 0 and data = NULL.

Definition at line 61 of file vector.hpp.

mfem::Vector::Vector

(

const Vector &

v

)

Copy constructor. Allocates a new data array and copies the data.

Definition at line 35 of file vector.cpp.

mfem::Vector::Vector ( int  s )

inlineexplicit

Creates vector of size s.

Warning

Entries are not initialized to zero!

Definition at line 445 of file vector.hpp.

mfem::Vector::Vector ( double *  _data, int  _size  )

inline

Creates a vector referencing an array of doubles, owned by someone else.

The pointer _data can be NULL. The data array can be replaced later with SetData().

Definition at line 73 of file vector.hpp.

mfem::Vector::Vector ( int  size_, MemoryType  mt  )

inline

Create a Vector of size size_ using MemoryType mt.

Definition at line 77 of file vector.hpp.

mfem::Vector::~Vector ( )

inlinevirtual

Destroys vector.

Definition at line 567 of file vector.hpp.

mfem::Vector::Vector ( N_Vector  nv )

explicit

(DEPRECATED) Construct a wrapper Vector from SUNDIALS N_Vector.

Definition at line 1176 of file vector.cpp.

Member Function Documentation

Vector & mfem::Vector::Add	(	const double	a,
		const Vector &	Va
	)

(*this) += a * Va

Definition at line 213 of file vector.cpp.

void mfem::Vector::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.

Definition at line 587 of file vector.cpp.

void mfem::Vector::AddElementVector	(	const Array< int > &	dofs,
		double *	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.

Definition at line 612 of file vector.cpp.

void mfem::Vector::AddElementVector	(	const Array< int > &	dofs,
		const double	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.

Definition at line 630 of file vector.cpp.

int mfem::Vector::Capacity ( ) const

inline

Return the size of the currently allocated data array.

It is always true that Capacity() >= Size().

Definition at line 164 of file vector.hpp.

int mfem::Vector::CheckFinite ( ) const

inline

Count the number of entries in the Vector for which isfinite is false, i.e. the entry is a NaN or +/-Inf.

Definition at line 366 of file vector.hpp.

void mfem::Vector::Destroy ( )

inline

Destroy a vector.

Definition at line 530 of file vector.hpp.

double mfem::Vector::DistanceSquaredTo ( const double *  p ) const

inline

Compute the square of the Euclidean distance to another vector.

Definition at line 589 of file vector.hpp.

double mfem::Vector::DistanceTo ( const double *  p ) const

inline

Compute the Euclidean distance to another vector.

Definition at line 594 of file vector.hpp.

double & mfem::Vector::Elem

(

int

i

)

Access Vector entries. Index i = 0 .. size-1.

Definition at line 97 of file vector.cpp.

const double & mfem::Vector::Elem

(

int

i

)

const

Read only access to Vector entries. Index i = 0 .. size-1.

Definition at line 102 of file vector.cpp.

double* mfem::Vector::GetData ( ) const

inline

Return a pointer to the beginning of the Vector data.

Warning

This method should be used with caution as it gives write access to the data of const-qualified Vectors.

Definition at line 169 of file vector.hpp.

Memory<double>& mfem::Vector::GetMemory ( )

inline

Return a reference to the Memory object used by the Vector.

Definition at line 183 of file vector.hpp.

const Memory<double>& mfem::Vector::GetMemory ( ) const

inline

Return a reference to the Memory object used by the Vector, const version.

Definition at line 187 of file vector.hpp.

void mfem::Vector::GetSubVector	(	const Array< int > &	dofs,
		Vector &	elemvect
	)		const

Extract entries listed in dofs to the output Vector elemvect.

Negative dof values cause the -dof-1 position in elemvect to receive the -val in from this Vector.

Definition at line 495 of file vector.cpp.

void mfem::Vector::GetSubVector	(	const Array< int > &	dofs,
		double *	elem_data
	)		const

Extract entries listed in dofs to the output array elem_data.

Negative dof values cause the -dof-1 position in elem_data to receive the -val in from this Vector.

Definition at line 510 of file vector.cpp.

const double* mfem::Vector::HostRead ( ) const

inline

Shortcut for mfem::Read(vec.GetMemory(), vec.Size(), false).

Definition at line 376 of file vector.hpp.

double* mfem::Vector::HostReadWrite ( )

inline

Shortcut for mfem::ReadWrite(vec.GetMemory(), vec.Size(), false).

Definition at line 392 of file vector.hpp.

double* mfem::Vector::HostWrite ( )

inline

Shortcut for mfem::Write(vec.GetMemory(), vec.Size(), false).

Definition at line 384 of file vector.hpp.

void mfem::Vector::Load	(	std::istream **	in,
		int	np,
		int *	dim
	)

Reads a vector from multiple files.

Definition at line 53 of file vector.cpp.

void mfem::Vector::Load	(	std::istream &	in,
		int	Size
	)

Load a vector from an input stream.

Definition at line 81 of file vector.cpp.

void mfem::Vector::Load ( std::istream &  in )

inline

Load a vector from an input stream, reading the size from the stream.

Definition at line 101 of file vector.hpp.

void mfem::Vector::MakeDataOwner ( ) const

inline

Set the Vector data (host pointer) ownership flag.

Definition at line 154 of file vector.hpp.

void mfem::Vector::MakeRef ( Vector &  base, int  offset, int  size  )

inline

Reset the Vector to be a reference to a sub-vector of base.

Definition at line 517 of file vector.hpp.

void mfem::Vector::MakeRef ( Vector &  base, int  offset  )

inline

Reset the Vector to be a reference to a sub-vector of base without changing its current size.

Definition at line 524 of file vector.hpp.

double mfem::Vector::Max

(

)

const

Returns the maximal element of the vector.

Definition at line 832 of file vector.cpp.

void mfem::Vector::median	(	const Vector &	lo,
		const Vector &	hi
	)

v = median(v,lo,hi) entrywise. Implementation assumes lo <= hi.

Definition at line 471 of file vector.cpp.

double mfem::Vector::Min

(

)

const

Returns the minimal element of the vector.

Definition at line 1105 of file vector.cpp.

void mfem::Vector::Neg

(

)

(*this) = -(*this)

Definition at line 253 of file vector.cpp.

void mfem::Vector::NewDataAndSize ( double *  d, int  s  )

inline

Set the Vector data and size, deleting the old data, if owned.

The Vector does not assume ownership of the new data. The new size is also used as the new Capacity().

See Also

SetDataAndSize().

Definition at line 134 of file vector.hpp.

void mfem::Vector::NewMemoryAndSize ( const Memory< double > &  mem, int  s, bool  own_mem  )

inline

Reset the Vector to use the given external Memory mem and size s.

If own_mem is false, the Vector will not own any of the pointers of mem.

See Also

NewDataAndSize().

Definition at line 508 of file vector.hpp.

double mfem::Vector::Norml1

(

)

const

Returns the l_1 norm of the vector.

Definition at line 772 of file vector.cpp.

double mfem::Vector::Norml2

(

)

const

Returns the l2 norm of the vector.

Definition at line 744 of file vector.cpp.

double mfem::Vector::Normlinf

(

)

const

Returns the l_infinity norm of the vector.

Definition at line 762 of file vector.cpp.

double mfem::Vector::Normlp

(

double

p

)

const

Returns the l_p norm of the vector.

Definition at line 782 of file vector.cpp.

mfem::Vector::operator const double * ( ) const

inline

Conversion to const double *.

Note

This conversion function makes it possible to use [] for indexing in addition to the overloaded operator()(int).

Definition at line 180 of file vector.hpp.

mfem::Vector::operator double * ( )

inline

Conversion to double *.

Note

This conversion function makes it possible to use [] for indexing in addition to the overloaded operator()(int).

Definition at line 175 of file vector.hpp.

double & mfem::Vector::operator() ( int  i )

inline

Access Vector entries using () for 0-based indexing.

Note

If MFEM_DEBUG is enabled, bounds checking is performed.

Definition at line 539 of file vector.hpp.

const double & mfem::Vector::operator() ( int  i ) const

inline

Read only access to Vector entries using () for 0-based indexing.

Note

If MFEM_DEBUG is enabled, bounds checking is performed.

Definition at line 547 of file vector.hpp.

double mfem::Vector::operator*

(

const double *

v

)

const

Dot product with a double * array.

Definition at line 107 of file vector.cpp.

double mfem::Vector::operator*

(

const Vector &

v

)

const

Return the inner-product.

Definition at line 1040 of file vector.cpp.

Vector & mfem::Vector::operator*=

(

double

c

)

Definition at line 152 of file vector.cpp.

Vector & mfem::Vector::operator+=

(

double

c

)

Definition at line 192 of file vector.cpp.

Vector & mfem::Vector::operator+=

(

const Vector &

v

)

Definition at line 201 of file vector.cpp.

Vector & mfem::Vector::operator-=

(

double

c

)

Definition at line 171 of file vector.cpp.

Vector & mfem::Vector::operator-=

(

const Vector &

v

)

Definition at line 180 of file vector.cpp.

Vector & mfem::Vector::operator/=

(

double

c

)

Definition at line 161 of file vector.cpp.

Vector & mfem::Vector::operator=

(

const double *

v

)

Copy Size() entries from v.

Definition at line 120 of file vector.cpp.

Vector & mfem::Vector::operator=

(

const Vector &

v

)

Copy assignment.

Note

Defining this method overwrites the implicitly defined copy assignment operator.

Definition at line 126 of file vector.cpp.

Vector & mfem::Vector::operator=

(

double

value

)

Redefine '=' for vector = constant.

Definition at line 143 of file vector.cpp.

bool mfem::Vector::OwnsData ( ) const

inline

Read the Vector data (host pointer) ownership flag.

Definition at line 197 of file vector.hpp.

void mfem::Vector::Print	(	std::ostream &	out = mfem::out,
		int	width = 8
	)		const

Prints vector to stream out.

Definition at line 672 of file vector.cpp.

void mfem::Vector::Print	(	adios2stream &	out,
		const std::string &	variable_name
	)		const

Prints vector to stream out.

Parameters

out	adios2stream output
variable_name	variable name associated with current Vector

Definition at line 697 of file vector.cpp.

void mfem::Vector::Print_HYPRE

(

std::ostream &

out

)

const

Prints vector to stream out in HYPRE_Vector format.

Definition at line 706 of file vector.cpp.

void mfem::Vector::Randomize

(

int

seed = 0

)

Set random values in the vector.

Definition at line 725 of file vector.cpp.

const double* mfem::Vector::Read ( bool  on_dev = true ) const

inline

Shortcut for mfem::Read(vec.GetMemory(), vec.Size(), on_dev).

Definition at line 372 of file vector.hpp.

double* mfem::Vector::ReadWrite ( bool  on_dev = true )

inline

Shortcut for mfem::ReadWrite(vec.GetMemory(), vec.Size(), on_dev).

Definition at line 388 of file vector.hpp.

Vector & mfem::Vector::Set	(	const double	a,
		const Vector &	x
	)

(*this) = a * x

Definition at line 228 of file vector.cpp.

void mfem::Vector::SetData ( double *  d )

inline

Set the Vector data.

Warning

This method should be called only when OwnsData() is false.

Definition at line 121 of file vector.hpp.

void mfem::Vector::SetDataAndSize ( double *  d, int  s  )

inline

Set the Vector data and size.

The Vector does not assume ownership of the new data. The new size is also used as the new Capacity().

Warning

This method should be called only when OwnsData() is false.

See Also

NewDataAndSize().

Definition at line 128 of file vector.hpp.

void mfem::Vector::SetSize ( int  s )

inline

Resize the vector to size s.

If the new size is less than or equal to Capacity() then the internal data array remains the same. Otherwise, the old array is deleted, if owned, and a new array of size s is allocated without copying the previous content of the Vector.

Warning

In the second case above (new size greater than current one), the vector will allocate new data array, even if it did not own the original data! Also, new entries are not initialized!

Definition at line 459 of file vector.hpp.

void mfem::Vector::SetSize ( int  s, MemoryType  mt  )

inline

Resize the vector to size s using MemoryType mt.

Definition at line 479 of file vector.hpp.

void mfem::Vector::SetSize ( int  s, Vector &  v  )

inline

Resize the vector to size s using the MemoryType of v.

Definition at line 117 of file vector.hpp.

void mfem::Vector::SetSubVector	(	const Array< int > &	dofs,
		const double	value
	)

Set the entries listed in dofs to the given value.

Negative dof values cause the -dof-1 position in this Vector to receive the -value.

Definition at line 521 of file vector.cpp.

void mfem::Vector::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.

Definition at line 542 of file vector.cpp.

void mfem::Vector::SetSubVector	(	const Array< int > &	dofs,
		double *	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.

Definition at line 568 of file vector.cpp.

void mfem::Vector::SetSubVectorComplement	(	const Array< int > &	dofs,
		const double	val
	)

Set all vector entries NOT in the dofs Array to the given val.

Definition at line 656 of file vector.cpp.

void mfem::Vector::SetVector	(	const Vector &	v,
		int	offset
	)

Definition at line 240 of file vector.cpp.

int mfem::Vector::Size ( ) const

inline

Returns the size of the vector.

Definition at line 160 of file vector.hpp.

void mfem::Vector::StealData ( double **  p )

inline

Changes the ownership of the data; after the call the Vector is empty.

Definition at line 200 of file vector.hpp.

double* mfem::Vector::StealData ( )

inline

Changes the ownership of the data; after the call the Vector is empty.

Definition at line 204 of file vector.hpp.

double mfem::Vector::Sum

(

)

const

Return the sum of the vector entries.

Definition at line 849 of file vector.cpp.

void mfem::Vector::Swap ( Vector &  other )

inline

Swap the contents of two Vectors.

Definition at line 555 of file vector.hpp.

void mfem::Vector::SyncAliasMemory ( const Vector &  v )

inline

Update the alias memory location of the vector to match v.

Definition at line 193 of file vector.hpp.

void mfem::Vector::SyncMemory ( const Vector &  v )

inline

Update the memory location of the vector to match v.

Definition at line 190 of file vector.hpp.

virtual MFEM_DEPRECATED N_Vector mfem::Vector::ToNVector ( )

inlinevirtual

(DEPRECATED) Return a new wrapper SUNDIALS N_Vector of type SUNDIALS_NVEC_SERIAL.

Deprecated:

The returned N_Vector must be destroyed by the caller.

Reimplemented in mfem::HypreParVector.

Definition at line 401 of file vector.hpp.

void mfem::Vector::ToNVector ( N_Vector &  nv, long  global_length = 0  )

virtual

Update an existing wrapper SUNDIALS N_Vector to point to this Vector.

Deprecated:

Parameters

[in]	nv	N_Vector to assign this vector's data to
[in]	global_length	An optional parameter that designates the global length. If nv is a parallel vector and global_length == 0 then this method will perform a global reduction and calculate the global length

Definition at line 1195 of file vector.cpp.

void mfem::Vector::UseDevice ( bool  use_dev ) const

inline

Enable execution of Vector operations using the mfem::Device.

The default is to use Backend::CPU (serial execution on each MPI rank), regardless of the mfem::Device configuration.

When appropriate, MFEM functions and class methods will enable the use of the mfem::Device for their Vector parameters.

Some derived classes, e.g. GridFunction, enable the use of the mfem::Device by default.

Definition at line 89 of file vector.hpp.

bool mfem::Vector::UseDevice ( ) const

inline

Return the device flag of the Memory object used by the Vector.

Definition at line 92 of file vector.hpp.

double* mfem::Vector::Write ( bool  on_dev = true )

inline

Shortcut for mfem::Write(vec.GetMemory(), vec.Size(), on_dev).

Definition at line 380 of file vector.hpp.

Friends And Related Function Documentation

void add ( const Vector &  v1, const Vector &  v2, Vector &  v  )

friend

Set v = v1 + v2.

Definition at line 261 of file vector.cpp.

void add ( const Vector &  v1, double  alpha, const Vector &  v2, Vector &  v  )

friend

Set v = v1 + alpha * v2.

Definition at line 283 of file vector.cpp.

void add ( const double  a, const Vector &  x, const Vector &  y, Vector &  z  )

friend

z = a * (x + y)

Definition at line 319 of file vector.cpp.

void add ( const double  a, const Vector &  x, const double  b, const Vector &  y, Vector &  z  )

friend

z = a * x + b * y

Definition at line 356 of file vector.cpp.

void subtract ( const Vector &  v1, const Vector &  v2, Vector &  v  )

friend

Set v = v1 - v2.

Definition at line 408 of file vector.cpp.

void subtract ( const double  a, const Vector &  x, const Vector &  y, Vector &  z  )

friend

z = a * (x - y)

Definition at line 434 of file vector.cpp.

Member Data Documentation

Memory<double> mfem::Vector::data

protected

Definition at line 55 of file vector.hpp.

int mfem::Vector::size

protected

Definition at line 56 of file vector.hpp.

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

• linalg/vector.hpp
• linalg/vector.cpp