org.jfree.data.function
Class PolynomialFunction2D

java.lang.Object
  org.jfree.data.function.PolynomialFunction2D

All Implemented Interfaces:

Serializable, Function2D

public class PolynomialFunction2D
extends Object
implements Function2D, Serializable

A function in the form y = a0 + a1 * x + a2 * x^2 + ... + an * x^n. Instances of this class are immutable.

Since:

1.0.14

See Also:

Serialized Form

Constructor Summary

PolynomialFunction2D(double[] coefficients)
Constructs a new polynomial function y = a0 + a1 * x + a2 * x^2 + ... + an * x^n

Method Summary

boolean	equals(Object obj) Tests this function for equality with an arbitrary object.
double[]	getCoefficients() Returns a copy of the coefficients array that was specified in the constructor.
int	getOrder() Returns the order of the polynomial.
double	getValue(double x) Returns the function value.
int	hashCode() Returns a hash code for this instance.

Methods inherited from class java.lang.Object

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

Constructor Detail

PolynomialFunction2D

public PolynomialFunction2D(double[] coefficients)

Constructs a new polynomial function y = a0 + a1 * x + a2 * x^2 + ... + an * x^n

Parameters:

coefficients - an array with the coefficients [a0, a1, ..., an] (null not permitted).

Method Detail

getCoefficients

public double[] getCoefficients()

Returns a copy of the coefficients array that was specified in the constructor.

Returns:

The coefficients array.

getOrder

public int getOrder()

Returns the order of the polynomial.

Returns:

The order.

getValue

public double getValue(double x)

Returns the function value.

Specified by:

getValue in interface Function2D

Parameters:

x - the x-value.

Returns:

The value.

equals

public boolean equals(Object obj)

Tests this function for equality with an arbitrary object.

Overrides:

equals in class Object

Parameters:

obj - the object (null permitted).

Returns:

A boolean.

hashCode

public int hashCode()

Returns a hash code for this instance.

Overrides:

hashCode in class Object

Returns:

A hash code.