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 a checkerboard matrix
Solve the Sudoku Row
Twins in a Window
Back to basics 1 - Saving
Code breaker, Part III: Operation Xiangliu
Comparison of floating-point numbers (doubles)
Rate of event occurence: find percentiles of the distribution (for smallish rates)
Make your own Test Suite (part 0)
Curve fitting (non-linear functions) & function handles
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