ca.pfv.spmf.datastructures.triangularmatrix

Class SparseTriangularMatrix

java.lang.Object

ca.pfv.spmf.datastructures.triangularmatrix.SparseTriangularMatrix

All Implemented Interfaces:

AbstractTriangularMatrix

public class SparseTriangularMatrix
extends java.lang.Object
implements AbstractTriangularMatrix

This class is for creating a triangular matrix of integers by using HashMaps (a sparse matrix rather than a full matrix). See the TriangularMatrixArray class for more details about what is a triangular matrix.

See Also:

AbstractTriangularMatrix, TriangularMatrix, AlgoCharm_Bitset, AlgoEclat_Bitset, AlgoEclat

Constructor Summary

Constructors

Constructor and Description
SparseTriangularMatrix() Constructor of a new triangular matrix.
SparseTriangularMatrix(int itemCount) This constructor is for compatibility with the other TriangularMatrix implementation.

Method Summary

Modifier and Type	Method and Description
int	getSupportForItems(int i, int j) Get the value stored at a given position
void	incrementCount(int i, int j) Increment the value at position i,j
void	setSupport(java.lang.Integer i, java.lang.Integer j, int support)
java.lang.String	toString() Return a reprensentation of the triangular matrix as a string.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SparseTriangularMatrix

public SparseTriangularMatrix()

Constructor of a new triangular matrix.

Parameters:

elementCount - the desired number of lines in the matrix.

SparseTriangularMatrix

public SparseTriangularMatrix(int itemCount)

This constructor is for compatibility with the other TriangularMatrix implementation. The parameter "itemCount" is not used.

Parameters:

itemCount -

Method Detail

toString

public java.lang.String toString()

Description copied from interface: AbstractTriangularMatrix

Return a reprensentation of the triangular matrix as a string.

Specified by:

toString in interface AbstractTriangularMatrix

Overrides:

toString in class java.lang.Object

incrementCount

public void incrementCount(int i,
                           int j)

Description copied from interface: AbstractTriangularMatrix

Increment the value at position i,j

Specified by:

incrementCount in interface AbstractTriangularMatrix

Parameters:

i - a row id

j - a column id

getSupportForItems

public int getSupportForItems(int i,
                              int j)

Description copied from interface: AbstractTriangularMatrix

Get the value stored at a given position

Specified by:

getSupportForItems in interface AbstractTriangularMatrix

Parameters:

i - a row id

j - a column id

Returns:

the value.

setSupport

public void setSupport(java.lang.Integer i,
                       java.lang.Integer j,
                       int support)

Specified by:

setSupport in interface AbstractTriangularMatrix