Solve ODE in MATLAB: ode23 vs ode23s Comparison | Code Error Fix

[becca1989]

Hi, I want to solve an ODE in MATLAB using ode23 and ode23s to compare results. I've written a code and it seems to work fine for ode23s, I even tried it for ode 23t and ode45 but for some reason when I use ode23 I get an error message.

This is the code I've been using;

function hode23seg

[T,Y]=ode23(@yprime1,[0 20],1);
[T2,Y2]=ode23s(@yprime1,[0 20],1);
semilogy(T,abs(Y),'bo',T2,abs(Y2),'r*');

function dy=yprime1(t,y)
dy=-30*y;

The error message is

? Error using ==> ode23
Too many input arguments.

Error in ==> hode23seg at 3
[T,Y]=ode23(@yprime1,[0 20],1);

Does anyone have any ideas what's going on?

Thanks

 

[mmwave]

for posting your question in the forum. From looking at your code, it seems like the error is occurring because you are passing in too many input arguments to the ode23 function. The ode23 function only takes in three arguments: the function handle, the time interval, and the initial condition.

In your code, you are passing in a fourth argument, which is causing the error. This could be because you are using a different version of MATLAB or a different syntax. I would suggest checking the documentation for the specific version of MATLAB you are using to make sure you are using the correct syntax for the ode23 function.

Additionally, I would recommend checking your code for any typos or errors that could be causing the issue. It's also a good idea to double check the function handle you are passing in to make sure it is correctly defined and matches the function you are trying to solve.

If you are still having trouble, you can try reaching out to the MATLAB support team for further assistance. They may be able to provide more specific guidance based on your code and version of MATLAB. Good luck with your ODE solving!