edu.northwestern.at.utils.math.matrix
Class DenseMatrix

java.lang.Object
  edu.northwestern.at.utils.math.matrix.AbstractMatrix
      edu.northwestern.at.utils.math.matrix.DenseMatrix

All Implemented Interfaces:

Matrix, java.io.Serializable

public class DenseMatrix
extends AbstractMatrix
implements Matrix

Implements a matrix as a dense two-dimensional array of doubles.

See Also:

Serialized Form

Field Summary

protected double[][]

matrixData The matrix contents as a two-dimensional array of doubles.

Fields inherited from class edu.northwestern.at.utils.math.matrix.AbstractMatrix

columns, rows

Constructor Summary

protected	DenseMatrix() Don't allow instantiation without size specification.
	DenseMatrix(int rows, int columns) Create a matrix of the specified size.

Method Summary

double	get(int row, int column) Gets value of element at given row and column.
void	set(int row, int column, double value) Set an element at the given position to a new value.

Methods inherited from class edu.northwestern.at.utils.math.matrix.AbstractMatrix

columns, get, getColumn, getColumnData, getColumns, getColumns, getCopy, getRow, getRowData, getRows, getRows, getSubMatrix, getSubMatrix, getSubMatrix, getSubMatrix, rows, set, set, setColumn, setColumnData, setColumnData, setRow, setRowData, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.northwestern.at.utils.math.matrix.Matrix

columns, get, getColumn, getColumnData, getColumns, getColumns, getCopy, getRow, getRowData, getRows, getRows, getSubMatrix, getSubMatrix, getSubMatrix, getSubMatrix, rows, set, set, setColumn, setColumnData, setColumnData, setRow, setRowData, toString

Field Detail

matrixData

protected double[][] matrixData

The matrix contents as a two-dimensional array of doubles.

Constructor Detail

DenseMatrix

protected DenseMatrix()

Don't allow instantiation without size specification.

DenseMatrix

public DenseMatrix(int rows,
                   int columns)

Create a matrix of the specified size.

Parameters:

rows - Number of rows.

columns - Number of columns.

Each element of the result matrix will be set to zero.

Method Detail

set

public void set(int row,
                int column,
                double value)

Set an element at the given position to a new value.

Specified by:

set in interface Matrix

Specified by:

set in class AbstractMatrix

Parameters:

row - Row in which the element occurs.

column - Column in which the element occurs.

value - The new value to be set.

get

public double get(int row,
                  int column)

Gets value of element at given row and column.

Specified by:

get in interface Matrix

Specified by:

get in class AbstractMatrix

Parameters:

row - Row in which the element occurs.

column - Column in which the element occurs.

Returns:

The value at the given position.