The function you are trying to use here is part of the Signal Processing Toolbox, which is not available on Cody. However, you might find another way of implementing your idea in core MATLAB without that specific function.
Find state names that start with the letter N
Count from 0 to N^M in base N.
Make a random, non-repeating vector.
Reindex a vector
Back to basics: adding comments to your code
Arrange the names in alphabetical order (1)
Back to basics: throwing errors / exceptions
The other half of the Fibonacci sequence
Curve fitting (non-linear functions) & function handles
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