Fit a parabola to three points and find the minimum point. where f(x1) = f1; f(x2) = f2; f(x3) = f3; and where x1 < x2 < x3; f(x2) < f(x1); f(x2) < f(x3). @param x1 A value of the argument to the parabolic function @param f1 The value of the function f(x1) at x1 @param x2 A value of the
(final double x1, final double f1,
final double x2, final double f2,
final double x3, final double f3)