public class MyFunctions {

/**
 * There are lots of functions here, and one must edit this code to select which
 * function is to be used.  One must also make sure that the function and the
 * derivative are selected together.
**/
  public static double f(double x)
  {
    double f1,f2,f3,f4,f5;

    f1 = x*x*x + 3.0*x + 1.0;
    f2 = x*x - 101.0;      // simple square root
    f3 = x*x + 2.0*x + 1;  // (x+1)^2
    f4 = x*x + 1;          // no real root exists
    f5 = x*x*x*x - 10.0*x*x*x + 35.0*x*x - 50.0* x + 24.0; // roots 1, 2, 3, 4
    return f5;
  }

  public static double fprime(double x)
  {
    double fp1,fp2,fp3,fp4,fp5;

    fp1 = 3.0*x*x + 3.0;
    fp2 = 2.0*x;
    fp3 = 2.0*x + 2.0;
    fp4 = 2.0*x;
    fp5 = 4.0*x*x*x - 30.0*x*x + 70.0*x - 50.0;
    return fp5;
  }

}