Package gov.nih.mipav.model.algorithms

Class CubicEquation

java.lang.Object

gov.nih.mipav.model.algorithms.CubicEquation

public class CubicEquation
extends java.lang.Object

This is a port of code written by Gerolamo Cardano under the Code Project Open Licence. A copy of the license if found at https://www.codeproject.com/info/cpol10.aspx. The equation is a1*x**3 + b*x**2 + c*x + d = 0 If result = 0, a1 = 0 If result = 1, x1 is real and x2 and x3 are complex with x3 = complex conjugate of x2 If result = 2, there are 3 real roots of which at least 2 are equal If result = 3, 3 real and unequal roots are found

Author:

ilb

Field Summary

Fields

Modifier and Type	Field	Description
private double	a1
private double	b
private double	c
private double	d
private int[]	result
private double[]	x1real
private double[]	x2imag
private double[]	x2real
private double[]	x3imag
private double[]	x3real

Constructor Summary

Constructors

Constructor	Description
CubicEquation()
CubicEquation(double a1, double b, double c, double d, double[] x1real, double[] x2real, double[] x2imag, double[] x3real, double[] x3imag, int[] result)

Method Summary

Modifier and Type	Method	Description
void	run()
void	selfTest()
double	Xroot(double a, double x)

Methods inherited from class java.lang.Object

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

Field Detail

a1

private double a1

b

private double b

c

private double c

d

private double d

x1real

private double[] x1real

x2real

private double[] x2real

x2imag

private double[] x2imag

x3real

private double[] x3real

x3imag

private double[] x3imag

result

private int[] result

Constructor Detail

CubicEquation

public CubicEquation()

CubicEquation

public CubicEquation(double a1,
                     double b,
                     double c,
                     double d,
                     double[] x1real,
                     double[] x2real,
                     double[] x2imag,
                     double[] x3real,
                     double[] x3imag,
                     int[] result)

Method Detail

selfTest

public void selfTest()

run

public void run()

Xroot

public double Xroot(double a,
                    double x)