JSci.maths.vectors
Class DoubleSparseVector

java.lang.Object
  JSci.maths.vectors.MathVector
      JSci.maths.vectors.AbstractDoubleVector
          JSci.maths.vectors.DoubleSparseVector

All Implemented Interfaces:

AbelianGroup.Member, BanachSpace.Member, Member, Module.Member, java.io.Serializable, VectorSpace.Member

public final class DoubleSparseVector

extends AbstractDoubleVector

The DoubleSparseVector class encapsulates sparse vectors. Uses Morse-coding.

See Also:

Serialized Form

Field Summary

Fields inherited from class JSci.maths.vectors.MathVector

N

Constructor Summary

DoubleSparseVector(double[] array)
Constructs a vector from an array.

DoubleSparseVector(int dim)
Constructs an empty vector.

Method Summary

AbelianGroup.Member	add(AbelianGroup.Member v) Returns the addition of this vector and another.
AbstractDoubleVector	add(AbstractDoubleVector v) Returns the addition of this vector and another.
DoubleSparseVector	add(DoubleSparseVector v) Returns the addition of this vector and another.
DoubleVector	add(DoubleVector v)
boolean	equals(java.lang.Object a) Compares two vectors for equality.
double	getComponent(int n) Returns a component of this vector.
AbstractDoubleVector	mapComponents(Mapping f) Applies a function on all the vector components.
double	mass() Returns the mass.
AbelianGroup.Member	negate() Returns the negative of this vector.
double	norm() Returns the l2-norm (magnitude).
AbstractDoubleVector	scalarDivide(double x) Returns the division of this vector by a scalar.
VectorSpace.Member	scalarDivide(Field.Member x) Returns the division of this vector by a scalar.
AbstractDoubleVector	scalarMultiply(double x) Returns the multiplication of this vector by a scalar.
Module.Member	scalarMultiply(Ring.Member x) Returns the multiplication of this vector by a scalar.
double	scalarProduct(AbstractDoubleVector v) Returns the scalar product of this vector and another.
double	scalarProduct(DoubleSparseVector v) Returns the scalar product of this vector and another.
double	scalarProduct(DoubleVector v)
void	setComponent(int n, double x) Sets the value of a component of this vector.
AbelianGroup.Member	subtract(AbelianGroup.Member v) Returns the subtraction of this vector by another.
AbstractDoubleVector	subtract(AbstractDoubleVector v) Returns the subtraction of this vector by another.
DoubleSparseVector	subtract(DoubleSparseVector v) Returns the subtraction of this vector by another.
DoubleVector	subtract(DoubleVector v)
double	sumSquares() Returns the sum of the squares of the components.
DoubleSparseMatrix	tensorProduct(DoubleSparseVector v) Returns the tensor product of this vector and another.

Methods inherited from class JSci.maths.vectors.AbstractDoubleVector

hashCode, infNorm, norm, normalize, toString

Methods inherited from class JSci.maths.vectors.MathVector

dimension, getInvalidComponentMsg

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DoubleSparseVector

public DoubleSparseVector(int dim)

Constructs an empty vector.

Parameters:

dim - the dimension of the vector.

DoubleSparseVector

public DoubleSparseVector(double[] array)

Constructs a vector from an array.

Method Detail

equals

public boolean equals(java.lang.Object a)

Compares two vectors for equality.

Overrides:

equals in class AbstractDoubleVector

Parameters:

a - a double sparse vector

getComponent

public double getComponent(int n)

Returns a component of this vector.

Specified by:

getComponent in class AbstractDoubleVector

Parameters:

n - index of the vector component

Throws:

VectorDimensionException - If attempting to access an invalid component.

setComponent

public void setComponent(int n,
                         double x)

Sets the value of a component of this vector.

Specified by:

setComponent in class AbstractDoubleVector

Parameters:

n - index of the vector component

x - a number

Throws:

VectorDimensionException - If attempting to access an invalid component.

norm

public double norm()

Returns the l²-norm (magnitude).

Specified by:

norm in interface BanachSpace.Member

Overrides:

norm in class AbstractDoubleVector

sumSquares

public double sumSquares()

Returns the sum of the squares of the components.

mass

public double mass()

Returns the mass.

Overrides:

mass in class AbstractDoubleVector

negate

public AbelianGroup.Member negate()

Returns the negative of this vector.

add

public AbelianGroup.Member add(AbelianGroup.Member v)

Returns the addition of this vector and another.

Parameters:

v - a group member

add

public AbstractDoubleVector add(AbstractDoubleVector v)

Returns the addition of this vector and another.

Specified by:

add in class AbstractDoubleVector

Parameters:

v - a double vector

Throws:

VectorDimensionException - If the vectors are different sizes.

add

public DoubleVector add(DoubleVector v)

add

public DoubleSparseVector add(DoubleSparseVector v)

Returns the addition of this vector and another.

Parameters:

v - a double sparse vector

Throws:

VectorDimensionException - If the vectors are different sizes.

subtract

public AbelianGroup.Member subtract(AbelianGroup.Member v)

Returns the subtraction of this vector by another.

Parameters:

v - a group member

subtract

public AbstractDoubleVector subtract(AbstractDoubleVector v)

Returns the subtraction of this vector by another.

Specified by:

subtract in class AbstractDoubleVector

Parameters:

v - a double vector

Throws:

VectorDimensionException - If the vectors are different sizes.

subtract

public DoubleVector subtract(DoubleVector v)

subtract

public DoubleSparseVector subtract(DoubleSparseVector v)

Returns the subtraction of this vector by another.

Parameters:

v - a double sparse vector

Throws:

VectorDimensionException - If the vectors are different sizes.

scalarMultiply

public Module.Member scalarMultiply(Ring.Member x)

Returns the multiplication of this vector by a scalar.

Parameters:

x - a ring member

scalarMultiply

public AbstractDoubleVector scalarMultiply(double x)

Returns the multiplication of this vector by a scalar.

Specified by:

scalarMultiply in class AbstractDoubleVector

Parameters:

x - a double

scalarDivide

public VectorSpace.Member scalarDivide(Field.Member x)

Returns the division of this vector by a scalar.

Parameters:

x - a field member

scalarDivide

public AbstractDoubleVector scalarDivide(double x)

Returns the division of this vector by a scalar.

Specified by:

scalarDivide in class AbstractDoubleVector

Parameters:

x - a double

Throws:

java.lang.ArithmeticException - If divide by zero.

scalarProduct

public double scalarProduct(AbstractDoubleVector v)

Returns the scalar product of this vector and another.

Specified by:

scalarProduct in class AbstractDoubleVector

Parameters:

v - a double vector

Throws:

VectorDimensionException - If the vectors are different sizes.

scalarProduct

public double scalarProduct(DoubleVector v)

scalarProduct

public double scalarProduct(DoubleSparseVector v)

Returns the scalar product of this vector and another.

Parameters:

v - a double sparse vector

Throws:

VectorDimensionException - If the vectors are different sizes.

tensorProduct

public DoubleSparseMatrix tensorProduct(DoubleSparseVector v)

Returns the tensor product of this vector and another.

mapComponents

public AbstractDoubleVector mapComponents(Mapping f)

Applies a function on all the vector components.

Specified by:

mapComponents in class AbstractDoubleVector

Parameters:

f - a user-defined function

Returns:

a double sparse vector