org.apache.giraph.aggregators.matrix.sparse

Class IntSparseMatrix

java.lang.Object

org.apache.giraph.aggregators.matrix.sparse.IntSparseMatrix

public class IntSparseMatrix
extends Object

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

Constructor Summary

Constructors

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

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Detail

IntSparseMatrix

public IntSparseMatrix(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 int 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,
                int v)

Set a specific entry of the matrix.

Parameters:

i - the row

j - the column

v - the value of the entry

getRow

public IntSparseVector getRow(int i)

Get a specific row of the matrix.

Parameters:

i - the row number

Returns:

the row of the matrix

setRow

public void setRow(int i,
                   IntSparseVector vec)

Set the int vector as the row specified.

Parameters:

i - the row

vec - the vector to set as the row