Re: Multiple variables in ode45

[Shai Ayal]

I'm not sure I understand -- is Vl a function or constant?
In general you e to solve your two equations (for u_dot and Vf_dot) 
simultaneously, and ide45 should be able to do this.

Shai

Ron Crummett wrote:
> Hi all -
>
> I am trying to solve a differential equation with ode45 that has two 
> input variables and one output, but one of the input variables is 
> dependent on the other.  When I try searching for anything like this it 
> is to no avail (maybe I don't know what to search for).
>
> Anyway, the equation is
>
> u_dot = 0.5*e_dot+1.64*(e-1.14*Vf_dot)
>
> where e = Vf-Vl, Vl is my input, and Vf is my output.  The value of u is 
> then fed into another system (which I do have the diff. eq. for) to get 
> Vf, if that helps.
>
> Could someone give me some pointers on how to do this?  Thanks.
>
> -Ron
>
>
>
> -------------------------------------------------------------
> Octave is freely available under the terms of the GNU GPL.
>
> Octave's home on the web:  http://www.octave.org
> How to fund new projects:  http://www.octave.org/funding.html
> Subscription information:  http://www.octave.org/archive.html
> -------------------------------------------------------------



-------------------------------------------------------------
Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
Subscription information:  http://www.octave.org/archive.html
-------------------------------------------------------------