How to give two inputs to a state space system in simulink?

Hallo Everyone

I have quite a simple doubt, but one that has been bugging me for quite a while. As the question states, I am not able to connect two step signals to a state space system in simulink block which has an A matrix of 4 by 4 size and so on. I tried connecting InPort. But I think I am not quite clear how it works. Any kind of suggestion or links would help.

Thanks a lot in advance.

Answer 1

[Azzi Abdelmalek]

Pass you two step signals through a Mux block

[nl2605]

Yes, but I want the signals to operate at the same time interval.

[Azzi Abdelmalek]

They do

[Azzi Abdelmalek]

Can you give more details about A,B,C and D?

[nl2605]

Yes, A is a 4 by 4 matrix and B is a 4 by 2 matrix C is 4 by 4 and D again 2 by 2 matrix. This was possible by Mux. And I thought MUX will be selecting one signal at one point of time. Thank you.

[nl2605]

Do you have any idea how can one create a Feedforward block in Simulink. I have a problem that I want to multiply 'A' matrix with 'X' (4 by 1 matrix). But in Simulink I don't know how to do it. 'A' matrix should come first and then 'X'. I am not getting how to do that.

[Azzi Abdelmalek]

If C is 4x4 and B is 4x2 then D can not be 2x2 it should be 4x2

[nl2605]

I am sorry. It was a typo. Yea,its 4 by 2 matrix.

[Azzi Abdelmalek]

For multiplication you can use a product block, but do not forget to change the parameters (in product block) from Element wise to Matrix

[nl2605]

I tried using the product block. I think it didn't work for the reason you mentioned. Thanks.

Answer 2

[Muhammad Adeel Ahsan Awan]

You can also use Vector concenate block to pass two inputs.