How to solve this error?
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I keep getting this error while running the state space model,
Error in port widths or dimensions. Output port 1 of 'statespacemodel_hvm/Mux' is a one dimensional vector with 2 elements.
Error in port widths or dimensions. Input port 1 of 'statespacemodel_hvm/State-Space' has 3 elements. This port does not accept the dimensions (or orientation) specified by the input signal.
Please help me with this.
4 Commenti
Priyatham Ganta
il 31 Ott 2015
Can you help me specifically in this.. When i simulate this model, there's always an error
Risposta accettata
Anuj
il 22 Gen 2014
You are getting this error because your matrix dimensions are conflicting. Make sure that the dimensions of matrices in inputs and outputs must agree.
6 Commenti
Anuj
il 23 Gen 2014
You can define it as you want, it depends on how you want to simulate it and how you find to do it easy.
Più risposte (4)
Raghav Gopal Rao Netrakanti
il 22 Apr 2020
Hi.
I am unable to solve this problem on my end as well.
Description:
I have a discrete state space system of 2 states, 2 inputs and 2 outputs. i.e all A B C D matrices are all 2 by 2. I used the discrete state space block and entered the values. Now my two inputs are 9400 by 1 vectors and i used the constant block to send them as input from the workspace. I have tried with mux and vector concantenate blocks, tried transpose but every time i get the same type of error
"Error in port widths or dimensions. Output port 1 of 'untitled/constant2' is a [9400x2] matrix
"Error in port widths or dimensions. Input port 1 of 'untitled/Discrete State-Space' has 2 elements. This port does not accept the dimensions (or orientation) specified by the input signal."
I hope someone can point out the mistake.
Regards,
Gopal
1 Commento
Walter Roberson
il 25 Apr 2020
If your inputs are 9400 x 1 vectors and you are working with 2 x 2 arrays, then I guess you have two of the 9400 x 1 vectors as inputs, representing the two different inputs for "2 inputs and 2 outputs" ?
What output size are you expecting for this 9400 x 1 vector(s) ?If you are expecting to reduce it to 1 x 2 or 2 x 1 then you would need a state space system with 9400 rows or columns in some of the matrices
Hiromasa
il 14 Giu 2024
Thank you for your question.
As the error text suggests, the error comes from dimension conflicts between a port and a block.
Ctrl+D updates the Simulink model and shows the signal deminsion as below. The exmaple below also shows the same error messages. You see "?" on input signal and output signal for State Space block. This is because State Space block expects 3 dimension signal while Input port demension is set to 2. Similarly, the dimension conflict occurs between Mux and Outpout port.
You may want to update the dimensions of either ports and/or State Space block to resolve this dimension conflict. Hope this information helps.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1716026/image.png)
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