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.
Make one big string out of two smaller strings
Convert Roman to Arabic Numerals
Sum of first n terms of a harmonic progression
Make a simplified barcode
Comparison of floating-point numbers (singles)
Arrange the names in alphabetical order (1)
Testing for randomness: uniform distribution of real numbers (distribution checking)
Back to basics: adding comments to your code
Comparison of floating-point numbers (doubles)
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