Dimensional Incompatibility Error Simulink

I have 2 step inputs. I need to multiply them with a 3x2 matrix B to implement B*u in Simulink. How can I do that? I am getting Dimensional incompatibility error.

Answer 1

[Sebastian Castro]

1. You can use a Mux or Vector Concatenate block on the 2 Step inputs to form a 2-element vector.
2. Then, use a Gain block with a value of B and the Multiplication mode to Matrix (K*u).

K is 3x2 and u is 2x1, so that should work out and give you a 3x1 output.

- Sebastian