Simulink State Space Error

16 views (last 30 days)
Dylan Ishman
Dylan Ishman on 28 Mar 2023
Commented: Dylan Ishman on 28 Mar 2023
I'm receiving the error:
Error in port widths or dimensions. 'Output Port 1' of 'Project1/Step' is a one dimensional vector with 1 elements.
Component:Simulink | Category:Model error
Error in port widths or dimensions. 'Input Port 1' of 'Project1/State-Space' has 2 elements. This port does not accept the dimensions (or orientation) specified by the input signal.
Component:Simulink | Category:Model error
When I run the attached simulink model. I inputted state space variables with size A: 4x4, B: 4x2, C: 1x4, D: 1x2 into the state space block. It seems that there is a dimension error with the sine wave input. How do I fix this?

Accepted Answer

Paul
Paul on 28 Mar 2023
Hi Dylan,
Unclear why the error message refers to "Project1/Step" when the model apparently does not contain a Step block.
Anyway, the state space model is expected a 2-dimensional input, so the parameters of the Sine block need to specify a 2D signal. That means at least one of the block parameters of the Sine block needs to be a 2-element vector. For example, set the Amplitude parameter to
[1 1]
so that Simulink "knows" the output should be 2D. Or if you want them to have different amplitudes, then
[1 2]
for example.
Use a two-element vector for any of the other parameters to assign different properties for the sine wave outputs.
  2 Comments
Fangjun Jiang
Fangjun Jiang on 28 Mar 2023
The "Sine" block is named as "Step". :)
Dylan Ishman
Dylan Ishman on 28 Mar 2023
This worked, thank you!

Sign in to comment.

More Answers (1)

Fangjun Jiang
Fangjun Jiang on 28 Mar 2023
Your A, B, C, D values specify that the size of the input is 2x1 (two inputs) but the Step block provides only one input.

Categories

Find more on Simulink Functions in Help Center and File Exchange

Products


Release

R2022b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!