code: static double quardMinimizer2(
  			double u, 
  			double du, 
  			double v, 
  			double dv
  			) 
  	{
  		double a = u - v;
  		double qm = v + dv / (dv - du) * a;
  		return qm;
  	}
docs: Find a minimizer of an interpolated quadratic function.
  @param  u       The value of one point, u.
  @param  du      The value of f'(u).
  @param  v       The value of another point, v.
  @param  dv      The value of f'(v).
  @return double  The minimizer of the interpolated quadratic.