public class UnknownFunctionDerivative {

    public static void main (String[] argv)
    {
        // Make an instance of the object.
        Simulator S = new Simulator ();
        
        double d = 0.01;

        for (double x=0; x<=10; x+=1) {
            // Compute derivative at x.
            double f = S.getValue (x);
            double fd = S.getValue (x+d);
            double g = (fd - f) / d;
            System.out.println ("x=" + x + "  g(x)=" + g);
        }
        
    }

}