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.
Return the largest number that is adjacent to a zero
Cody Computer Part 1 - Guess the system font used by uipanel
Vectorizing, too easy or too hard?
Convert a vector into a number
Make your own Test Suite (part 0)
Just take it easy for a second or two!
Curve fitting (non-linear functions) & function handles
Make your own Test Suite (part 2)
Computational power of Cody servers
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