MATLAB: Does MATLAB r2016a not recognize “cheby1” as a function

cheby1filter

I wrote a code implementing a Chebyshev filter which worked fine in my previous version of MATLAB r2013a. I recently had to update to r2016a and the "cheby1" function is no longer recognized. Why is this the case?

Best Answer

The function cheby1 is part of the Signal Processing Toolbox. Do you have this toolbox installed, and a valid license for it ?
To check, run this command in your command window, and tell us exactly what it prints:
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