Solving non-linear ode

2020 7 25
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更新时间：2020 7 26
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I have this ode of acceleration:
where 2B(Fi,Li )=const
I need to find the postion function and then derivate to find the velocity. I tried to use ode45 and then tried to derivate using diff but I get an error :u ndefined function 'diff' for input arguments of type 'struct'.
anyone has an idea how i can solve this ode and then to find the velocity?

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回答（1 个）

Alan Stevens
Alan Stevens 2020-7-26

0 个投票

ODE45 solves first order equations, so represent your second order one as two first order ones:
ODE45 will then automatically return the velocity as well as the displacement. (See documentation on ODE45 for more details).

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