hello everybody, I was trying to solve a simple pendulum second order linear differential equation of the form y''=-(g/l)*sin(y) while using the ode45 function. since it's a second order equation I understood that I have to manipulate the problem, so it will fit the ode45.
The mathematical manipulation I did is described in the attached picture.
I can't understand why my code fails…please help
g=9.8;l=0.5;t_span=[0 30];teta0=deg2rad(60);F=@(t,q) [q(2);-(g/l)*sin(q(2))];[t,q]=ode45(@(t,q) F(t,q),t_span,teta0)
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