If the input is a negative number, generate an error. Otherwise, return the number.
Sort a list of complex numbers based on far they are from the origin.
give nth decimal place of pi
Create a cell array out of a struct
Return the first and last character of a string
07 - Common functions and indexing 5
Check if a directory is on the current MATLAB search path
Create cell array of numeric arrays
Pentago: find winning move
Create a figure and plot data
Create cell array of strings
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