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.
Filter AC, pass DC
Find S-parameters of the circuit
Sum the Infinite Series II
Next lexicographic - permutation
Make your own Test Suite (part 3)
Arrange the names in alphabetical order (1)
Just take it easy for a second or two!
Add all the numbers between two limits (inclusive)
Rate of event occurence: find percentiles of the distribution (for smallish rates)
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