how to call matrix from workspace into simulink and return it in workspace?

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How can I call a matrix from workspace in matlab into simulink and do some mathematical operations on it and return it in matlab workspace?
for example:
I use "simin" block in simulink to get the matrix A=[1 2 3], then with a "matlab function" block I want to get the size of the matrix A the matrix and finally using a "simout" block I want to export the size of A into the workspace, but it doesn't work.
I have also attached the screenshot.
Can someone help please?

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