Package gov.nih.mipav.model.algorithms

Class 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

      All Methods Instance Methods Concrete Methods 
      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)