Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Software » comp.soft-sys.matlab

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

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
stanley ontario

Posts: 3
Registered: 4/30/13
Re: How to get second derivatives using ode45
Posted: Apr 30, 2013 10:23 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply


> 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.



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.