Question
I am writing "trans=tf([1 5],[1])" and the error is "Undefined function 'tf' for input arguments of type 'double'.
Expert Answer
Neeta Dsouza
PhD Expert
Answered Aug 18, 2026
You do not have the Control Systems Toolbox installed, or you do not have it licensed, or it is not on your MATLAB path.
Try
which -all tf
and see what you get.
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