de.lmu.ifi.dbs.elki.index.tree.metrical.mtreevariants.mktrees.mkapp
Class PolynomialApproximation

java.lang.Object
  de.lmu.ifi.dbs.elki.index.tree.metrical.mtreevariants.mktrees.mkapp.PolynomialApproximation

All Implemented Interfaces:

Externalizable, Serializable

public class PolynomialApproximation
extends Object
implements Externalizable

Provides an polynomial approximation bo + b1*k + b2*k^2 + ... + bp*k^p for knn-distances consisting of parameters b0, ..., bp.

Author:

Elke Achtert

See Also:

Serialized Form

Field Summary

private double[]	b The parameters b0, ..., bp.
private static long	serialVersionUID

Constructor Summary

PolynomialApproximation()
Empty constructor for serialization purposes.

PolynomialApproximation(double[] b)
Provides an polynomial approximation bo + b1*k + b2*k^2 + ... + bp*k^p for knn-distances consisting of parameters b0, ..., bp.

Method Summary

double	getB(int p) Returns the parameter bp at the specified index p.
double[]	getCoefficients() Returns a copy of the the array of coefficients b0, ..., bp.
int	getPolynomialOrder() Returns the order of the polynom.
double	getValueAt(int k) Returns the function value of the polynoial approximation at the specified k.
void	readExternal(ObjectInput in) The object implements the readExternal method to restore its contents by calling the methods of DataInput for primitive types and readObject for objects, strings and arrays.
String	toString() Returns a string representation of the object.
void	writeExternal(ObjectOutput out) The object implements the writeExternal method to save its contents by calling the methods of DataOutput for its primitive values or calling the writeObject method of ObjectOutput for objects, strings, and arrays.

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

b

private double[] b

The parameters b0, ..., bp.

Constructor Detail

PolynomialApproximation

public PolynomialApproximation()

Empty constructor for serialization purposes.

PolynomialApproximation

public PolynomialApproximation(double[] b)

Provides an polynomial approximation bo + b1*k + b2*k^2 + ... + bp*k^p for knn-distances consisting of parameters b0, ..., bp.

Parameters:

b - the parameters b0, ..., bi

Method Detail

getB

public double getB(int p)

Returns the parameter bp at the specified index p.

Parameters:

p - the index

Returns:

the parameter bp at the specified index p

getCoefficients

public double[] getCoefficients()

Returns a copy of the the array of coefficients b0, ..., bp.

Returns:

the a copy of the array of coefficients b0, ..., bp

getPolynomialOrder

public int getPolynomialOrder()

Returns the order of the polynom.

Returns:

the order of the polynom

getValueAt

public double getValueAt(int k)

Returns the function value of the polynoial approximation at the specified k.

Parameters:

k - the value for which the polynoial approximation should be returned

Returns:

the function value of the polynoial approximation at the specified k

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

The object implements the writeExternal method to save its contents by calling the methods of DataOutput for its primitive values or calling the writeObject method of ObjectOutput for objects, strings, and arrays.

Specified by:

writeExternal in interface Externalizable

Parameters:

out - the stream to write the object to

Throws:

IOException

readExternal

public void readExternal(ObjectInput in)
                  throws IOException

The object implements the readExternal method to restore its contents by calling the methods of DataInput for primitive types and readObject for objects, strings and arrays. The readExternal method must read the values in the same sequence and with the same types as were written by writeExternal.

Specified by:

readExternal in interface Externalizable

Parameters:

in - the stream to read data from in order to restore the object

Throws:

IOException

toString

public String toString()

Returns a string representation of the object.

Overrides:

toString in class Object

Returns:

a string representation of the object.