net.sourceforge.combean.mathprog.linalg
Class IdentityMatrix

java.lang.Object
  net.sourceforge.combean.mathprog.linalg.IdentityMatrix

All Implemented Interfaces:

AbstractMatrix, ColumnMatrix, Matrix, RowMatrix

public class IdentityMatrix
extends Object
implements Matrix

The identity matrix for a given dimension.

Constructor Summary

IdentityMatrix(int dimension)
Constructor.

Method Summary

SparseVector	getColumnVector(int localColumn) Return a column vector of the matrix.
double	getDoubleAt(int row, int column)
int	getNumColumns() Return the number of columns of the model component.
int	getNumRows() Return the number of rows of the model component.
SparseVector	getRowVector(int localRow) Return a row vector of the matrix.

Methods inherited from class java.lang.Object

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

Constructor Detail

IdentityMatrix

public IdentityMatrix(int dimension)

Constructor.

Parameters:

dimension - the dimension (number of rows = number of columns) of the matrix.

Method Detail

getDoubleAt

public double getDoubleAt(int row,
                          int column)

Specified by:

getDoubleAt in interface Matrix

getColumnVector

public SparseVector getColumnVector(int localColumn)

Description copied from interface: ColumnMatrix

Return a column vector of the matrix.

Specified by:

getColumnVector in interface ColumnMatrix

Parameters:

localColumn - the index of the column

Returns:

the corresponding column vector

getRowVector

public SparseVector getRowVector(int localRow)

Description copied from interface: RowMatrix

Return a row vector of the matrix.

Specified by:

getRowVector in interface RowMatrix

Parameters:

localRow - the index of the row

Returns:

the corresponding row vector

getNumColumns

public int getNumColumns()

Description copied from interface: AbstractMatrix

Return the number of columns of the model component.

Specified by:

getNumColumns in interface AbstractMatrix

Returns:

the number of columns.

getNumRows

public int getNumRows()

Description copied from interface: AbstractMatrix

Return the number of rows of the model component.

Specified by:

getNumRows in interface AbstractMatrix

Returns:

the number of rows.