org.apache.giraph.aggregators.matrix.dense

Class DoubleDenseVector

java.lang.Object

org.apache.giraph.aggregators.matrix.dense.DoubleDenseVector

All Implemented Interfaces:

org.apache.hadoop.io.Writable

public class DoubleDenseVector
extends Object
implements org.apache.hadoop.io.Writable

The double dense vector holds the values of a particular row. The singleton is used to avoid creating too many objects by compactly represent vectors with a single nonzero coordinate. This way we perform aggregations efficiently.

Constructor Summary

Constructors

Constructor and Description
DoubleDenseVector() Create a new vector with default size.
DoubleDenseVector(int size) Create a new vector with given size.

Method Summary

Modifier and Type	Method and Description
void	add(DoubleDenseVector other) Add the vector specified.
double	get(int i) Get a particular entry of the vector.
int	getSingletonIndex() Get the singleton index.
double	getSingletonValue() Get the singleton value.
void	readFields(DataInput in)
void	set(int i, double value) Set the given value to the entry with the index specified.
void	setSingleton(int index, double value) Set the singleton index and value.
void	write(DataOutput out)

Methods inherited from class java.lang.Object

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

Constructor Detail

DoubleDenseVector

public DoubleDenseVector()

Create a new vector with default size.

DoubleDenseVector

public DoubleDenseVector(int size)

Create a new vector with given size.

Parameters:

size - the size of the vector

Method Detail

setSingleton

public void setSingleton(int index,
                         double value)

Set the singleton index and value.

Parameters:

index - the index

value - the value

getSingletonIndex

public int getSingletonIndex()

Get the singleton index.

Returns:

the singleton index

getSingletonValue

public double getSingletonValue()

Get the singleton value.

Returns:

the singleton value

get

public double get(int i)

Get a particular entry of the vector.

Parameters:

i - the entry

Returns:

the value of the entry.

set

public void set(int i,
                double value)

Set the given value to the entry with the index specified.

Parameters:

i - the entry

value - the value to set to the entry

add

public void add(DoubleDenseVector other)

Add the vector specified. This is a vector addition that does an element-by-element addition.

Parameters:

other - the vector to add.

write

public void write(DataOutput out)
           throws IOException

Specified by:

write in interface org.apache.hadoop.io.Writable

Throws:

IOException

readFields

public void readFields(DataInput in)
                throws IOException

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Throws:

IOException