DenseMatrix Class Reference

A class for full (non-sparse) matrices with Fortran-compatible data storage, which adds matrix operations to class Array2D. More...

#include <DenseMatrix.h>

Inheritance diagram for DenseMatrix:

Detailed Description

A class for full (non-sparse) matrices with Fortran-compatible data storage, which adds matrix operations to class Array2D.

The dense matrix class adds matrix operations onto the Array2D class. These matrix operations are carried out by the appropriate BLAS and LAPACK routines

Definition at line 41 of file DenseMatrix.h.

Public Member Functions
	DenseMatrix ()=default
	Default Constructor.
	DenseMatrix (size_t n, size_t m, double v=0.0)
	Constructor.
	DenseMatrix (const DenseMatrix &y)
DenseMatrix &	operator= (const DenseMatrix &y)
void	resize (size_t n, size_t m, double v=0.0) override
	Resize the matrix.
virtual void	mult (span< const double > b, span< double > prod) const
virtual void	mult (const DenseMatrix &b, DenseMatrix &prod) const
	Multiply A*B and write result to prod.
virtual void	leftMult (span< const double > b, span< double > prod) const
	Left-multiply the matrix by transpose(b), and write the result to prod.
vector< int > &	ipiv ()
	Return a changeable value of the pivot vector.
const vector< int > &	ipiv () const
	Return a changeable value of the pivot vector.
Public Member Functions inherited from Array2D
	Array2D ()=default
	Default constructor.
	Array2D (const size_t m, const size_t n, const double v=0.0)
	Constructor.
	Array2D (const size_t m, const size_t n, span< const double > values)
	Constructor.
	Array2D (const Array2D &y)
Array2D &	operator= (const Array2D &y)
virtual void	resize (size_t n, size_t m, double v=0.0)
	Resize the array, and fill the new entries with 'v'.
void	appendColumn (span< const double > c)
	Append a column to the existing matrix using a std vector.
void	setRow (size_t n, span< const double > rw)
	Set the nth row to array rw.
void	getRow (size_t n, span< double > rw) const
	Get the nth row and return it in a vector.
void	setColumn (size_t m, span< const double > col)
	Set the values in column m to those in array col.
void	getColumn (size_t m, span< double > col) const
	Get the values in column m.
void	zero ()
	Set all of the entries to zero.
double &	operator() (size_t i, size_t j)
	Allows setting elements using the syntax A(i,j) = x.
double	operator() (size_t i, size_t j) const
	Allows retrieving elements using the syntax x = A(i,j).
double &	value (size_t i, size_t j)
	Returns a changeable reference to position in the matrix.
double	value (size_t i, size_t j) const
	Returns the value of a single matrix entry.
size_t	nRows () const
	Number of rows.
size_t	nColumns () const
	Number of columns.
vector< double > &	data ()
	Return a reference to the data vector.
const vector< double > &	data () const
	Return a const reference to the data vector.
void	operator*= (double a)
span< double >	col (size_t j)
	Return a writable span over column j.
span< const double >	col (size_t j) const
	Return a read-only span over column j.

Protected Attributes
vector< int >	m_ipiv
	Vector of pivots. Length is equal to the max of m and n.
Protected Attributes inherited from Array2D
vector< double >	m_data
	Data stored in a single array.
size_t	m_nrows = 0
	Number of rows.
size_t	m_ncols = 0
	Number of columns.

Constructor & Destructor Documentation

DenseMatrix() [1/3]

DenseMatrix ( )

default

Default Constructor.

DenseMatrix() [2/3]

DenseMatrix	(	size_t	n,
		size_t	m,
		double	v = 0.0
	)

Constructor.

Create an n by m matrix, and initialize all elements to v.

Parameters

n	New number of rows
m	New number of columns
v	Default fill value. defaults to zero.

Definition at line 20 of file DenseMatrix.cpp.

DenseMatrix() [3/3]

DenseMatrix

(

const DenseMatrix &

y

)

Definition at line 26 of file DenseMatrix.cpp.

Member Function Documentation

operator=()

DenseMatrix & operator=

(

const DenseMatrix &

y

)

Definition at line 32 of file DenseMatrix.cpp.

resize()

void resize ( size_t  n, size_t  m, double  v = 0.0  )

overridevirtual

Resize the matrix.

Resize the matrix to n rows by m cols.

Parameters

n	New number of rows
m	New number of columns
v	Default fill value. defaults to zero.

Reimplemented from Array2D.

Definition at line 42 of file DenseMatrix.cpp.

mult() [1/2]

void mult ( span< const double >  b, span< double >  prod  ) const

virtual

Definition at line 48 of file DenseMatrix.cpp.

mult() [2/2]

void mult ( const DenseMatrix &  b, DenseMatrix &  prod  ) const

virtual

Multiply A*B and write result to prod.

Take this matrix to be of size NxM.

Parameters

[in]	b	DenseMatrix B of size MxP
[out]	prod	DenseMatrix prod size NxP

Definition at line 65 of file DenseMatrix.cpp.

leftMult()

void leftMult ( span< const double >  b, span< double >  prod  ) const

virtual

Left-multiply the matrix by transpose(b), and write the result to prod.

Parameters

b	left multiply by this vector. The length must be equal to n the number of rows in the matrix.
prod	Resulting vector. This is of length m, the number of columns in the matrix

Definition at line 83 of file DenseMatrix.cpp.

ipiv() [1/2]

vector< int > & ipiv

(

)

Return a changeable value of the pivot vector.

Returns

a reference to the pivot vector as a vector<int>

Definition at line 96 of file DenseMatrix.cpp.

ipiv() [2/2]

const vector< int > & ipiv ( ) const

inline

Return a changeable value of the pivot vector.

Returns

a reference to the pivot vector as a vector<int>

Definition at line 99 of file DenseMatrix.h.

Member Data Documentation

m_ipiv

vector<int> m_ipiv

protected

Vector of pivots. Length is equal to the max of m and n.

Definition at line 105 of file DenseMatrix.h.

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

• DenseMatrix.h
• DenseMatrix.cpp