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.
Read a column of numbers and interpolate missing data
Test if a Number is a Palindrome without using any String Operations
Number of Circles in a Number
Monte Carlo integration: area of a polygon
Is input the global variable z?
Make your own Test Suite (part 0)
Wait a second!
Back to basics: throwing errors / exceptions
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