f

#### ode45 & events : error in Matlab 7 SP1, oke in Matlab 6.5

```I wrote a program some time ago, which was working fine with Matlab
6.5 . I've upgraded to Matlab 7(SP1) and now it's not running
anymore. I've getting an error while integrating a differential
equation.

I'm having the following error :

??? Error using ==> horzcat
All matrices on a row in the bracketed expression must have the
same number of rows.

Error in ==> ode45 at 393
teout = [teout, te]

Error in ==> flo_zoek_punt_doorsnede>controle at 211
[tijd,trajectorie,te,ye,ie] = ode45(@opl_aantr,[0
teind],[startpunt],options,LIAP_INSTAB,LIAP_STAB);

It has something to do with the event function, but I don't know who
to solve it. Do I have to change something to my code?

Thanks

Liesbeth Luyckx

PS My code is the following :

options = odeset('event', @zoek_nul);
[tijd,trajectorie,te,ye,ie] = ode45(@opl_aantr,[0
teind],[startpunt],options,LIAP_INSTAB,LIAP_STAB);
------------------------------
function [value,isterminal,direction] =
zoek_nul(t,y,LIAP_AANTR,STAB_LIAP)

WAARDE = Liapunov1(y'); % Liapunov1 is a function

WA1 = WAARDE - LIAP_AANTR;
WA2 = WAARDE - STAB_LIAP;

value = [WA1; WA2];
isterminal = [0 ; 1];
direction=[0; 0];

-------------------------------
function out1 = opl_aantr(t,y,LIAP_AANTR,STAB_LIAP)

gegevens; % the parameter values are in this file
% g and mu_d are both functions
out1 = zeros(4,1);

out1(1) = y(2);
out1(2) = - 2 * dzeta1 * y(2) - g(y(1)) - g(y(1) - y(3)) -
mu_d(y(1));
out1(3) = y(4);
out1(4) = - 2 * dzeta2 * y(4) - g(y(3) - y(1));
```
 0
liesbeth (2)
5/20/2005 2:30:43 PM
comp.soft-sys.matlab 211266 articles. 19 followers. lunamoonmoon (257) is leader.

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```Liesbeth,

Your code is probably o.k -- there was a bug introduced in MATLAB 7.0 and
fixed in SP2.

Take a look at our Technical Solution 1-QAZDS, available at
http://www.mathworks.com/support/solutions/data/1-QAZDS.html?solution=1-QAZDS

Hope that this fixes your problem.

Regards,
Jacek

--------------------

"Liesbeth Luyckx" <liesbeth@autoctrl.NOSPAM.UGent.be> wrote in message
news:ef06a32.-1@webx.raydaftYaTP...
>I wrote a program some time ago, which was working fine with Matlab
> 6.5 . I've upgraded to Matlab 7(SP1) and now it's not running
> anymore. I've getting an error while integrating a differential
> equation.
>
> I'm having the following error :
>
> ??? Error using ==> horzcat
> All matrices on a row in the bracketed expression must have the
> same number of rows.
>
> Error in ==> ode45 at 393
>        teout = [teout, te]
>
> Error in ==> flo_zoek_punt_doorsnede>controle at 211
>    [tijd,trajectorie,te,ye,ie] = ode45(@opl_aantr,[0
> teind],[startpunt],options,LIAP_INSTAB,LIAP_STAB);
>
> It has something to do with the event function, but I don't know who
> to solve it. Do I have to change something to my code?
>
> Thanks
>
> Liesbeth Luyckx
>
> PS My code is the following :
>
> options = odeset('event', @zoek_nul);
> [tijd,trajectorie,te,ye,ie] = ode45(@opl_aantr,[0
> teind],[startpunt],options,LIAP_INSTAB,LIAP_STAB);
> ------------------------------
> function [value,isterminal,direction] =
> zoek_nul(t,y,LIAP_AANTR,STAB_LIAP)
>
> WAARDE = Liapunov1(y'); % Liapunov1 is a function
>
> WA1 = WAARDE - LIAP_AANTR;
> WA2 = WAARDE - STAB_LIAP;
>
> value = [WA1; WA2];
> isterminal = [0 ; 1];
> direction=[0; 0];
>
> -------------------------------
> function out1 = opl_aantr(t,y,LIAP_AANTR,STAB_LIAP)
>
> gegevens; % the parameter values are in this file
> % g and mu_d are both functions
> out1 = zeros(4,1);
>
> out1(1) = y(2);
> out1(2) = - 2 * dzeta1 * y(2) - g(y(1)) - g(y(1) - y(3)) -
> mu_d(y(1));
> out1(3) = y(4);
> out1(4) = - 2 * dzeta2 * y(4) - g(y(3) - y(1));

```
 0
5/20/2005 4:08:22 PM
```Thanks :-)

Liesbeth
```
 0
liesbeth (2)
5/23/2005 8:14:21 AM

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