org.apache.giraph.aggregators.matrix.sparse

Class DoubleSparseMatrix

java.lang.Object

org.apache.giraph.aggregators.matrix.sparse.DoubleSparseMatrix

public class DoubleSparseMatrix
extends Object

A double matrix holds the values of the entries in double vectors. It keeps one double aggregator per matrix row.

Constructor Summary

Constructors

Constructor and Description
DoubleSparseMatrix(int numRows) Create a new matrix with the given number of rows.

Method Summary

Modifier and Type	Method and Description
double	get(int i, int j) Get a specific entry of the matrix.
int	getNumRows() Get the number of rows in the matrix.
void	initialize() Create a empty matrix with all values set to 0.0
void	set(int i, int j, double v) Set a specific entry of the matrix.

Methods inherited from class java.lang.Object

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

Constructor Detail

DoubleSparseMatrix

public DoubleSparseMatrix(int numRows)

Create a new matrix with the given number of rows.

Parameters:

numRows - the number of rows.

Method Detail

initialize

public void initialize()

Create a empty matrix with all values set to 0.0

getNumRows

public int getNumRows()

Get the number of rows in the matrix.

Returns:

the number of rows.

get

public double get(int i,
                  int j)

Get a specific entry of the matrix.

Parameters:

i - the row

j - the column

Returns:

the value of the entry

set

public void set(int i,
                int j,
                double v)

Set a specific entry of the matrix.

Parameters:

i - the row

j - the column

v - the value of the entry