Package it.unimi.dsi.law.vector

Class DenseVector

java.lang.Object

it.unimi.dsi.law.vector.Vector

it.unimi.dsi.law.vector.DenseVector

All Implemented Interfaces:

Serializable

public class DenseVector
extends Vector

A mutable implementation of Vector optimized for dense vectors.

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
void	add(double alpha, Vector v)	Adds values in vector v scaled by alpha to this vector.
double	dotProduct(Vector v)	Returns the dot product between v and this vector.
double	ell1Norm()	Returns the l1 norm of this vector.
double	ell2Norm()	Returns the l2 norm of this vector.
double	euclideanDistance(Vector v)	Returns the euclidean distance between v and this vector.
double	get(int idx)	Gets the value at index idx.
static DenseVector	getInstance(double[] value, int id)	Returns an instance from an array of values.
static DenseVector	getInstance(int size, int id)	Returns an instance of given size with zero values.
void	scale(double alpha)	Scale values in this vector by a value alpha.
void	set(int idx, double val)	Sets the value val at index idx.
void	zero()	Reset (to zero) this vector.

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

isMutable

Methods inherited from class java.lang.Object

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

Method Details

getInstance

public static DenseVector 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 DenseVector getInstance(double[] value,
int id)

Returns an instance from an array of values.

Parameters:

value - an array 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.

add

public void add(double alpha,
Vector v)

Description copied from class: Vector

Adds values in vector v scaled by alpha to this vector.

Overrides:

add in class Vector

Parameters:

alpha - the scaling factor.

v - the vector to add.

scale

public void scale(double alpha)

Description copied from class: Vector

Scale values in this vector by a value alpha.

Overrides:

scale in class Vector

Parameters:

alpha - the scaling factor

zero

public void zero()

Description copied from class: Vector

Reset (to zero) this vector.

Overrides:

zero in class Vector

dotProduct

public double dotProduct(Vector v)

Description copied from class: Vector

Returns the dot product between v and this vector.

Overrides:

dotProduct in class Vector

Parameters:

v - the vector.

Returns:

the dot product.

euclideanDistance

public double euclideanDistance(Vector v)

Description copied from class: Vector

Returns the euclidean distance between v and this vector.

Overrides:

euclideanDistance in class Vector

Parameters:

v - the vector.

Returns:

the euclidean distance.

ell2Norm

public double ell2Norm()

Description copied from class: Vector

Returns the l₂ norm of this vector.

Overrides:

ell2Norm in class Vector

Returns:

the l₂ norm.

ell1Norm

public double ell1Norm()

Description copied from class: Vector

Returns the l₁ norm of this vector.

Overrides:

ell1Norm in class Vector