function yprime = parabola_ode ( x, y )
%
%  function yprime = parabola_ode ( x, y )
%
%  computes the derivative for the parabola ODE:
%
%    Y' = 2.0 * x
%
size ( x )
size ( y )
x
cos ( x )
ass = cos ( x )
yprime = [ 2.0 * x; ass ];


