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Topic: How to get second derivatives using ode45
Replies: 4   Last Post: Apr 30, 2013 11:15 AM

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stanley ontario

Posts: 3
Registered: 4/30/13
Re: How to get second derivatives using ode45
Posted: Apr 30, 2013 10:23 AM
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> vib_equ returns the first and second derivative of Y(:,1) in dy(1) and dy(2) as well as the first and second derivative of Y(:,3) in dy(3) and dy(4). So what's the problem ?
> Best wishes
> Torsten.

Thank you for your answer.

My problem is that I would like to call vib_equ outside the ode45, but if I do so, I have an error implying that there are undefined variables.

For example if I want to plot both acceleration I need the values of dy(2) and dy(4), but I don't know how to call them.

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