Need help in solving this error.

I want to estimate 2 parameters. My system is linear and I am using Recursive Least square block from System Identificaion toolbox.

I am getting the following error messages:

Error:Error in port widths or dimensions. The "Regressors" port of the "untitled1/Recursive Least Squares Estimator" block expects a 2-dimensional signal with 2 columns, but found 1 columns.

Error:Error in port widths or dimensions. 'Output Port 1' of 'untitled1/Recursive Least Squares Estimator/Check Signals/Regressors' is a one dimensional vector with 2 elements.

My Regressor matrix is of Dimension 499x3, where first column is time.

My output matrix is of dimension 499x2, where first column is time.

I have seen other examples for reference but I am not able to find the mistake here. I need help. Thank you.

Answer 1

[Pooja Kumari]

Hi,

The error messages you're encountering suggest that there is a mismatch between the expected input dimensions for the "Regressors" port of the Recursive Least Squares Estimator block and the actual input you're providing. Since you want to estimate 2 parameters, your regressor matrix should have 2 columns (excluding the time column), and your output matrix should have 1 column (also excluding the time column).

There might be error due to timeseries data "y".You can extract the data and pass it as y.

[Shlok]

First of all thank you for answering my question. The dimensions of my vectors were correct. I do not know how the error had occured but the error has been solved now. I redid everything exactly the same way and it worked this time. Thanks.