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Topic: diff eq
Replies: 8   Last Post: Apr 11, 2013 2:27 AM

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Bruno Luong

Posts: 8,813
Registered: 7/26/08
Re: diff eq
Posted: Apr 8, 2013 2:21 AM
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"richard " <richard7893@embarqmail.com> wrote in message <kjrsih$mgb$1@newscl01ah.mathworks.com>...

>
> this is what I am typing into MATLAB:
> function dx = system_ex(t,x)
> dx = zeros(4,1);
> dx(1) = -2.4712*x(1) + 0.005*x(2) + 0.56*x(3)+ 0.1*x(4);
> dx(2) = 0.385*x(1) - 0.1002*x(2)
> dx(3) = 0.002*x(2) - 0.6462*x(3)
> dx(4) = 0.007*a(2) - 0.2042*x(4)
> [T,X] = ode45(@systems_ex,[0 10],[1 0 0 0])
> plot(t,x(:,1))
>


I hope you save system_ex in an mfile and call ode45 on another mfile. You seem to put everything in the same mfile.

Bruno


Date Subject Author
4/7/13
Read diff eq
Guest
4/8/13
Read Re: diff eq
Bruno Luong
4/10/13
Read Re: diff eq
Guest
4/10/13
Read Re: diff eq
Torsten
4/10/13
Read Re: diff eq
Guest
4/10/13
Read Re: diff eq
Torsten
4/10/13
Read Re: diff eq
Bart
4/11/13
Read Re: diff eq
Torsten
4/10/13
Read Re: diff eq
richard

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