How is the Runge-Kutta method implemented on this differential equation:
$$ \frac{d^2 \theta}{dt} = -\frac{g}{l} \theta $$
(pendulum motion) which is in polar coordinates?
Let: $c = \frac{g}{l}$
So the first step is:
$$a1 = y_2 dt $$ $$b1 = -c y_1 dt $$
Is this correct? How do I continue from here?