how to solve the ploblem :When simulating the response to a specific input signal, the input data U must be a matrix with as many rows as samples in the time vector T

If you encounter the problem "When simulating the response to a specific input signal, the input data U must be a matrix with as many rows as samples in the time vector T", it means that there is a mismatch between the number of samples in the time vector T and the number of rows in the input matrix U. To solve this problem, you need to make sure that the number of rows in the input matrix U is equal to the number of samples in the time vector T.

One way to do this is to use the "size" function in MATLAB to get the number of samples in the time vector T, and then reshape the input matrix U to have the same number of rows. For example, if T is a column vector with 100 samples, you can use the following code to reshape U:

U = reshape(U, 100, []);

This will reshape U to have 100 rows and the same number of columns as before. Make sure to transpose U if it was originally a row vector.

Alternatively, you can also manually adjust the size of the input matrix U to match the number of samples in the time vector T. Just make sure that the data in U is properly aligned with the time vector T, so that each row of U corresponds to the input signal at a specific time sample.