Impulse response error in complex matrix

Hello, I'd like to draw impulse response of state-space model (A,B,C is real matirx).

sys=ss(A,B,C,[]);

impulse(sys);

And it works good, but when I draw impulse response of modal form of that system it doesn't work. First I changed system matrix to modal form A_mod, B_mod, C_mod.

sys_mod = ss(A_mod, B_mod, C_mod, []);

impulse(sys_mod);

but it occurs error. Errors is said that when using 'set', setting property 'YData' of Line, it's not valid VectorData. Complex input is not supported.

It's true that A_mod, B_mod, C_mod is composed of complex number, but it's the problem that Only in my computer, this error occurs. When I changed other computer, this code works good.

So, I re-install matlab again, other version or changed 64bits to 32bits, but it didn't work. What is the problem?? I'm sorry to my poor English. Thanks.

Answer 1

[Navaneeth Raman]

Hello,

Can you share the state space matrix for which you get an error? Post the exact error message as well as the version of MATLAB being used and the OS details.

Thanks, Navaneeth