Package it.unimi.dsi.law.vector

Class Int2DoubleMapVector

java.lang.Object

it.unimi.dsi.law.vector.Vector

it.unimi.dsi.law.vector.Int2DoubleMapVector

All Implemented Interfaces:

Serializable

public class Int2DoubleMapVector
extends Vector

A mutable implementation of Vector for sparse vectors. It is possible to create sparse vector by iteratively adding values. This implementation uses the supertype method for every operation. It should be converted with toImmutableSparseVector() before being actually used.

See Also:

Serialized Form

Field Summary

Fields inherited from class it.unimi.dsi.law.vector.Vector

ell1norm, ell2norm, id, INVALID_ID, INVALID_NORM, size

Method Summary

Modifier and Type	Method	Description
double	get(int idx)	Gets the value at index idx.
static Int2DoubleMapVector	getInstance(int size, int id)	Returns an instance of given size with zero values.
static Int2DoubleMapVector	getInstance(int size, Int2DoubleMap value, int id)	Returns an instance from the given Int2DoubleMap.
void	set(int idx, double val)	Sets the value val at index idx.
ImmutableSparseVector	toImmutableSparseVector()

Methods inherited from class it.unimi.dsi.law.vector.Vector

add, dotProduct, ell1Norm, ell2Norm, euclideanDistance, isMutable, scale, zero

Methods inherited from class java.lang.Object

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

Method Details

getInstance

public static Int2DoubleMapVector getInstance(int size,
int id)

Returns an instance of given size with zero values.

Parameters:

size - the size.

id - the id of description of this vector.

Returns:

a vector

getInstance

public static Int2DoubleMapVector getInstance(int size,
Int2DoubleMap value,
int id)

Returns an instance from the given Int2DoubleMap.

Parameters:

size - the size.

value - a map of values.

id - the id of description of this vector.

Returns:

a vector.

set

public void set(int idx,
double val)

Description copied from class: Vector

Sets the value val at index idx.

Specified by:

set in class Vector

Parameters:

idx - the index.

val - the value.

get

public double get(int idx)

Description copied from class: Vector

Gets the value at index idx.

Specified by:

get in class Vector

Parameters:

idx - the index.

Returns:

the value at index idx.

toImmutableSparseVector

public ImmutableSparseVector toImmutableSparseVector()