Matlab & Simulink answers for state space model are different?

Plots of matlab and simulink state-space model are different. Matlab stepplot makes sense and correct.But simulink model with same matrices and same input is not. Cannot find what went wrong?

Answer 1

[Birdman]

It is because that in your code, you discretize your system already and most probably you used discretized version in Simulink, which are Ad,Bd,Cd,Dd but you need to use continuous forms of them and make the discretizing in Simulink explicitly. See the attached model. Run it and see the results.

[Shehara Perera]

Thanks Birdman.