Epetra_IntSerialDenseVector Class Reference

Epetra_IntSerialDenseVector: A class for constructing and using dense vectors. More...

#include <Epetra_IntSerialDenseVector.h>

Inheritance diagram for Epetra_IntSerialDenseVector:

[legend]Collaboration diagram for Epetra_IntSerialDenseVector:

[legend]List of all members.

Public Member Functions
	Epetra_IntSerialDenseVector ()
	Default constructor; defines a zero size object.
	Epetra_IntSerialDenseVector (int Length)
	Sized constructor; defines a variable-sized object.
	Epetra_IntSerialDenseVector (Epetra_DataAccess CV, int *Values, int Length)
	Set object values from one-dimensional array.
	Epetra_IntSerialDenseVector (const Epetra_IntSerialDenseVector &Source)
	Epetra_IntSerialDenseVector copy constructor.
int	Size (int Length)
	Set length of a Epetra_IntSerialDenseVector object; init values to zero.
int	Resize (int Length)
	Resize a Epetra_IntSerialDenseVector object.
virtual	~Epetra_IntSerialDenseVector ()
	Epetra_IntSerialDenseVector destructor.
int &	operator() (int Index)
	Element access function.
const int &	operator() (int Index) const
	Element access function.
int &	operator[] (int Index)
	Element access function.
const int &	operator[] (int Index) const
	Element access function.
int	Random ()
	Set vector values to random numbers.
int	Length () const
	Returns length of vector.
int *	Values ()
	Returns pointer to the values in vector.
const int *	Values () const
	Returns const pointer to the values in vector.
Epetra_DataAccess	CV () const
	Returns the data access mode of the this vector.
Epetra_IntSerialDenseVector &	operator= (const Epetra_IntSerialDenseVector &Source)
	Copy from one vector to another.
I/O methods
virtual void	Print (ostream &os) const
	Print service methods; defines behavior of ostream << operator.
Expert-only unsupported methods
int	MakeViewOf (const Epetra_IntSerialDenseVector &Source)
	Reset an existing IntSerialDenseVector to point to another Vector.

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Detailed Description

Epetra_IntSerialDenseVector: A class for constructing and using dense vectors.

The Epetra_IntSerialDenseVector class enables the construction and use of integer-valued, dense vectors. It derives from the Epetra_IntSerialDenseMatrix class.

The Epetra_IntSerialDenseVector class is intended to provide convenient vector notation but derives all signficant functionality from Epetra_IntSerialDenseMatrix.

Constructing Epetra_IntSerialDenseVector Objects

There are three Epetra_IntSerialDenseVector constructors. The first constructs a zero-length object which should be made to appropriate length using the Size() or Resize() functions and then filled with the [] or () operators. The second constructs an object sized to the dimension specified, which should be filled with the [] or () operators. The third is a constructor that accepts user data as a 1D array, and the fourth is a copy constructor. The third constructor has two data access modes (specified by the Epetra_DataAccess argument):

1. Copy mode - Allocates memory and makes a copy of the user-provided data. In this case, the user data is not needed after construction.
2. View mode - Creates a "view" of the user data. In this case, the user data is required to remain intact for the life of the object.

Warning:

View mode is extremely dangerous from a data hiding perspective. Therefore, we strongly encourage users to develop code using Copy mode first and only use the View mode in a secondary optimization phase.

Extracting Data from Epetra_IntSerialDenseVector Objects

Once a Epetra_IntSerialDenseVector is constructed, it is possible to view the data via access functions.

Warning:

Use of these access functions cam be extremely dangerous from a data hiding perspective.

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Constructor & Destructor Documentation

Epetra_IntSerialDenseVector::Epetra_IntSerialDenseVector

(

)

Default constructor; defines a zero size object.

Epetra_IntSerialDenseVector objects defined by the default constructor should be sized with the Size() or Resize functions. Values should be defined by using the [] or () operators.

Epetra_IntSerialDenseVector::Epetra_IntSerialDenseVector

(

int

Length

)

Sized constructor; defines a variable-sized object.

Parameters:

In

Length - Length of vector.

Epetra_IntSerialDenseVector objects defined by the sized constructor are already sized to the dimension given as a parameter. All values are initialized to 0. Calling this constructor is equivalent to using the default constructor, and then calling the Size function on it. Values should be defined by using the [] or () operators.

Epetra_IntSerialDenseVector::Epetra_IntSerialDenseVector	(	Epetra_DataAccess	CV,
		int *	Values,
		int	Length
	)

Set object values from one-dimensional array.

Parameters:

	In	Epetra_DataAccess - Enumerated type set to Copy or View.
	In	Values - Pointer to an array of integer numbers containing the values.
	In	Length - Length of vector.

See Detailed Description section for further discussion.

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Member Function Documentation

int Epetra_IntSerialDenseVector::MakeViewOf

(

const Epetra_IntSerialDenseVector &

Source

)

Reset an existing IntSerialDenseVector to point to another Vector.

Allows an existing IntSerialDenseVector to become a View of another vector's data, regardless of the DataAccess mode of the Source vector. It is assumed that the Source vector is an independent vector, and no checking is done to verify this.

This is used by Epetra_CrsGraph in the OptimizeStorage method. It is used so that an existing (Copy) vector can be converted to a View. This frees up memory that CrsGraph no longer needs.

Parameters:

Source

The IntSerialDenseVector this will become a view of.

Returns:

Integer error code, set to 0 if successful.

Warning:

This method is extremely dangerous and should only be used by experts.

const int & Epetra_IntSerialDenseVector::operator()

(

int

Index

)

const [inline]

Element access function.

Returns the specified element of the vector.

Returns:

Specified element in vector.

Warning:

No bounds checking is done unless Epetra is compiled with HAVE_EPETRA_ARRAY_BOUNDS_CHECK.

int & Epetra_IntSerialDenseVector::operator()

(

int

Index

)

[inline]

Element access function.

Returns the specified element of the vector.

Returns:

Specified element in vector.

Warning:

No bounds checking is done unless Epetra is compiled with HAVE_EPETRA_ARRAY_BOUNDS_CHECK.

Epetra_IntSerialDenseVector& Epetra_IntSerialDenseVector::operator=

(

const Epetra_IntSerialDenseVector &

Source

)

Copy from one vector to another.

The operator= allows one to copy the values from one existing IntSerialDenseVector to another. The left hand side vector will take on the data access mode of the right hand side vector.

Returns:

Values of the left hand side vector are modified by the values of the right hand side vector.

const int & Epetra_IntSerialDenseVector::operator[]

(

int

Index

)

const [inline]

Element access function.

Returns the specified element of the vector.

Returns:

Specified element in vector.

Warning:

No bounds checking is done unless Epetra is compiled with HAVE_EPETRA_ARRAY_BOUNDS_CHECK.

Reimplemented from Epetra_IntSerialDenseMatrix.

int & Epetra_IntSerialDenseVector::operator[]

(

int

Index

)

[inline]

Element access function.

Returns the specified element of the vector.

Returns:

Specified element in vector.

Warning:

No bounds checking is done unless Epetra is compiled with HAVE_EPETRA_ARRAY_BOUNDS_CHECK.

Reimplemented from Epetra_IntSerialDenseMatrix.

int Epetra_IntSerialDenseVector::Random

(

)

Set vector values to random numbers.

IntSerialDenseVector uses the random number generator provided by Epetra_Util. The vector values will be set to random values on the interval (0, 2^31 - 1).

Returns:

Integer error code, set to 0 if successful.

Reimplemented from Epetra_IntSerialDenseMatrix.

int Epetra_IntSerialDenseVector::Resize

(

int

Length

)

[inline]

Resize a Epetra_IntSerialDenseVector object.

Parameters:

In

Length - Length of vector object.

Allows user to define the dimension of a Epetra_IntSerialDenseVector. This function can be called at any point after construction. Any values that were previously in this object are copied into the new size. If the new shape is smaller than the original, the first Length values are copied to the new vector.

Returns:

Integer error code, set to 0 if successful.

int Epetra_IntSerialDenseVector::Size

(

int

Length

)

[inline]

Set length of a Epetra_IntSerialDenseVector object; init values to zero.

Parameters:

In

Length - Length of vector object.

Allows user to define the dimension of a Epetra_IntSerialDenseVector. This function can be called at any point after construction. Any values that were previously in this object are destroyed and the resized vector starts off with all zero values.

Returns:

Integer error code, set to 0 if successful.

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

• Epetra_IntSerialDenseVector.h

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