Create a matrix in Simulink

The diagram below is the block diagram that I have created in order to generate the matrix B.

I want the matrix B to be in the size of [9x6] but what I have done in the simulink give me a warning message as: 'Magnetic/B' generated a [9x6] matrix data. It automatically reshaped the data to a one dimensional vector with 54 elements.

My question is: How to make the matrix B stay in the size of [9x6]?

I have attached the simulink model in the file as well. I am really appreciate your help.

Answer 1

[Ameer Hamza]

Because in the function Interpreted MATLAB function block B, you have set the output dimension to 54. Change it to [9 6].

[Linee Teh]

Thank you! Why I didn't think of that easy way! Really appreciate your help

[Ameer Hamza]

I am glad to be of help.

[Linee Teh]

Hey Ameer, I have another question.

If my control law is u = -kx and substitute the control law into the state space equation x_dot = Ax + Bu, it give me x_dot = (A-BK)x and the first figure below shows the configuration.

Then, I added the disturbance into the system but it shouldn't look like this as shown in the figure below. Input matrix B and Gain K should be multiply with each other and the disturbance is added on. How can I modified the simulink block to get what I want?

Thank you..

[Ameer Hamza]

"I added the disturbance into the system" is an ambiguous term. Where are you adding the disturbance? In the state-vector? In the control input? In the output vector? All of these are possible. Can you show the equation of your system with the disturbance added to it?

[Linee Teh]

I am sorry that I forget to included the equation. x_dot=(A-BK)x + d where d is the disturbance.

[Ameer Hamza]

do it like this