net.aerith.misao.util
Class Cubics

java.lang.Object
  |
  +--net.aerith.misao.util.Cubics

public class Cubics

extends java.lang.Object

The Cubics represents a cubic function of x and y. It consists of 10 coefficients from A to J which represent:

     z = A + Bx + Cy + Dxx + Exy + Fyy + Gxxx + Hxxy + Ixyy + Jyyy
 

Field Summary

private double	A The constant item.
private double	B The coefficient of x.
private double	C The coefficient of y.
private double	D The coefficient of x^2.
private int	data_count The number of (x,y,z) data to solve the simultaneous equation.
private double	E The coefficient of x y.
private double	F The coefficient of y^2.
private double	G The coefficient of x^3.
private double	H The coefficient of x^2 y.
private double	I The coefficient of x y^2.
private double	J The coefficient of y^3.
private SimultaneousEquation	se The simultaneous equation to solve this cubic function.

Constructor Summary

Cubics()
Constructs an empty Cubics.

Method Summary

static Cubics	create(java.lang.String string) Creates a Cubics object from the String object which represents the cubic function.
java.lang.String	getOutputString() Returns a string representation of the state of this object.
double	getValue(double x, double y) Gets z value of the specified (x,y).
Cubics	negative() Creates a negative cubic function of this one.
void	setData(double x, double y, double z) Adds a (x,y,z) data to solve the simultaneous equation.
void	solve() Solves the simultaneous equation and calculates this cubic function in the least square method.

Methods inherited from class java.lang.Object

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

Field Detail

A

private double A

The constant item.

B

private double B

The coefficient of x.

C

private double C

The coefficient of y.

D

private double D

The coefficient of x^2.

E

private double E

The coefficient of x y.

F

private double F

The coefficient of y^2.

G

private double G

The coefficient of x^3.

H

private double H

The coefficient of x^2 y.

I

private double I

The coefficient of x y^2.

J

private double J

The coefficient of y^3.

se

private SimultaneousEquation se

The simultaneous equation to solve this cubic function.

data_count

private int data_count

The number of (x,y,z) data to solve the simultaneous equation.

Constructor Detail

Cubics

public Cubics()

Constructs an empty Cubics.

Method Detail

getValue

public double getValue(double x,
                       double y)

Gets z value of the specified (x,y).

Parameters:

x - the x value.

y - the y value.

Returns:

z value of the specified (x,y).

setData

public void setData(double x,
                    double y,
                    double z)

Adds a (x,y,z) data to solve the simultaneous equation.

Parameters:

x - the x value.

y - the y value.

z - the z value.

solve

public void solve()

Solves the simultaneous equation and calculates this cubic function in the least square method.

negative

public Cubics negative()

Creates a negative cubic function of this one.

Returns:

a negative cubic function of this one.

create

public static Cubics create(java.lang.String string)

Creates a Cubics object from the String object which represents the cubic function.

Parameters:

string - the string which represents the cubic function.

Returns:

a new Cubics of the specified string.

getOutputString

public java.lang.String getOutputString()

Returns a string representation of the state of this object.

Returns:

a string representation of the state of this object.