Class Matrix

java.lang.Object

solvers.linearSystem.simple.matrix.Matrix

Direct Known Subclasses:

StandardMatrix

public abstract class Matrix
extends Object

An abstract class that provides functionality required of the matrices of the simple linear system. This includes: - the ability to write to positions in the matrix - The ability to multiply by the matrix - A list of positions in the matrix that are to be updated.

Author:

Jack Bradshaw

Field Summary

Fields

Modifier and Type	Field	Description
protected CoMoMBasis	basis	The basis of the model under consideration.
protected int	size	Size of Square Matrix
protected List<Tuple<Integer,Integer>>	update_list	List of positions to update

Constructor Summary

Constructors

Constructor	Description
Matrix(CoMoMBasis basis, int size)	Constructor

Method Summary

Modifier and Type	Method	Description
protected abstract void	fillWithZeros()	Makes every entry in the array 0
abstract BigRational	get(int row, int col)	Returns value a (row, col)
abstract BigRational[][]	getArray()	Returns the matrix as a BigRational[][] array
List<Tuple<Integer,Integer>>	getUpdateList()	Returns the update list.
abstract BigRational[]	multiply()	Multiplies the previous basis by the matrix
abstract void	print()	Prints the matrix to screen
void	reset()	Reset the data structures for the generation of the linear system for a new class.
void	toBeUpdated(int row, int col)	Adds (row, col) to the list of of positions to be updated
abstract void	write(int row, int col, BigRational v)	Writes value v at position (row,col) in matrix

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

update_list

protected List<Tuple<Integer,Integer>> update_list

List of positions to update

size

protected int size

Size of Square Matrix

basis

protected CoMoMBasis basis

The basis of the model under consideration.

Constructor Details

Matrix

public Matrix(CoMoMBasis basis,
 int size)

Constructor

Parameters:

basis - The CoMoM basis of the model under consideration

size - The size of the basis (will make a matrix of size: size x size)

Method Details

getArray

public abstract BigRational[][] getArray()

Returns the matrix as a BigRational[][] array

Returns:

underlying matrix

write

public abstract void write(int row,
 int col,
 BigRational v)

Writes value v at position (row,col) in matrix

Parameters:

row - row to be written at

col - column two be written at

v - value to be written

get

public abstract BigRational get(int row,
 int col)

Returns value a (row, col)

Parameters:

row - row

col - column

Returns:

array[row][column]

multiply

public abstract BigRational[] multiply()

Multiplies the previous basis by the matrix

Returns:

rhs of linear system

toBeUpdated

public void toBeUpdated(int row,
 int col)

Adds (row, col) to the list of of positions to be updated

Parameters:

row - row

col - column

getUpdateList

public List<Tuple<Integer,Integer>> getUpdateList()

Returns the update list.

Returns:

the list of positions to be updated

reset

public void reset()

Reset the data structures for the generation of the linear system for a new class.

fillWithZeros

protected abstract void fillWithZeros()

Makes every entry in the array 0

print

public abstract void print()

Prints the matrix to screen