Opus5
Class SparseMatrixAsVector

java.lang.Object
  |
  +--Opus5.SparseMatrixAsVector

All Implemented Interfaces:

Matrix, SparseMatrix

public class SparseMatrixAsVector

extends java.lang.Object

implements SparseMatrix

Sparse matrix implemented using a vector of triples.

Version:

$Id: SparseMatrixAsVector.java,v 3.2 1998/07/28 03:02:23 brpreiss Exp $

Author:

Bruno R. Preiss, P.Eng.

Field Summary

protected Opus5.SparseMatrixAsVector.Entry[]	array An array of triples (entries).
protected int	numberOfColumns The number of columns.
protected int	numberOfElements The maximum number of non-zero elements in this matrix.
protected int	numberOfRows The number of rows.

Fields inherited from interface Opus5.SparseMatrix

copyright

Constructor Summary

SparseMatrixAsVector(int numberOfRows, int numberOfColumns, int numberOfElements)
Construct a SparseMatrixAsVector with the specified dimensions and maximum number of non-zero elements.

Method Summary

protected int	findPosition(int i, int j) Finds the position of the (i,j)th matrix entry.
double	get(int i, int j) Returns the value in this matrix at the specified position.
Matrix	plus(Matrix mat) Returns the sum of this matrix and the specified matrix.
void	put(int i, int j, double datum) Stores the specified value in this matrix at the specified position.
void	putZero(int i, int j) Stores a zero in this matrix at the specified position.
Matrix	times(Matrix mat) Returns the product of this matrix and the specified matrix.
Matrix	transpose() Returns the transpose of this matrix.

Methods inherited from class java.lang.Object

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

Field Detail

numberOfRows

protected int numberOfRows

The number of rows.

numberOfColumns

protected int numberOfColumns

The number of columns.

numberOfElements

protected int numberOfElements

The maximum number of non-zero elements in this matrix.

array

protected Opus5.SparseMatrixAsVector.Entry[] array

An array of triples (entries).

Constructor Detail

SparseMatrixAsVector

public SparseMatrixAsVector(int numberOfRows,
                            int numberOfColumns,
                            int numberOfElements)

Construct a SparseMatrixAsVector with the specified dimensions and maximum number of non-zero elements.

Parameters:

numberOfRows - The number of rows.

numberOfColumns - The number of columns.

numberOfElements - The maximum number of non-zero elements in this matrix.

Method Detail

findPosition

protected int findPosition(int i,
                           int j)

Finds the position of the (i,j)th matrix entry.

Parameters:

i - The row number.

j - The column number.

Returns:

The position of the (i,j)th matrix entry; -1 if the matrix entry is zero.

get

public double get(int i,
                  int j)

Returns the value in this matrix at the specified position.

Specified by:

get in interface Matrix

Parameters:

i - The row number.

j - The column number.

Returns:

The value in this matrix at the specified position.

put

public void put(int i,
                int j,
                double datum)

Stores the specified value in this matrix at the specified position.

Specified by:

put in interface Matrix

Parameters:

i - The row number.

j - The column number.

datum - The value to be stored.

putZero

public void putZero(int i,
                    int j)

Stores a zero in this matrix at the specified position.

Specified by:

putZero in interface SparseMatrix

Parameters:

i - The row number.

j - The column number.

transpose

public Matrix transpose()

Returns the transpose of this matrix.

Specified by:

transpose in interface Matrix

Returns:

The transpose of this matrix.

times

public Matrix times(Matrix mat)

Returns the product of this matrix and the specified matrix.

Specified by:

times in interface Matrix

Parameters:

The - specified matrix.

Returns:

The product of this matrix and the specified matrix

plus

public Matrix plus(Matrix mat)

Returns the sum of this matrix and the specified matrix. This method is not implemented.

Specified by:

plus in interface Matrix

Parameters:

The - specified matrix.

Returns:

The sum of this matrix and the specified matrix

Throws:

MethodNotImplemented - Always.