Problem in matlab code run error.

Dear community I try to run a code but i recieved an error. screen shot of both error and matlab coding attached. I try very hard to resolve but still get no successs.

My complex model run properly. But when i add two integrals for calculations of error then my model give these error messages.

By default min step size in solver is auto. After receiving error i changed it to a value shown below in attached fig.

Your resposne will be highly appreciated.

Answer 1

[Sudarshan]

Hello Muhammad Asad,

The error message that you have shared indicates that one of the signals in your model is diverging to plus or minus infinity. It could be possible that a signal is changing too rapidly based on the solver settings.

This basically means that the solver is unstable for the equations represented by the model. I believe that it could be a stiff model that requires more stability for the solver.

A quick fix would be to select your solver as “ode45” and see if it works.

You can also refer to the documentation below to find out the correct solver for your model based on the requirements:

https://in.mathworks.com/help/releases/R2022a/simulink/ug/choose-a-solver.html#f11-69449

Another suggested way is to reduce the maximum order of the model as suggested in the documentation below:

https://in.mathworks.com/help/releases/R2022a/simulink/gui/maximum-order.html

Hope it helps!!