what's the "str2num" mean?
str2num means "convert string to number"; even more cryptic is the fact that "str2num 1:10" is equivalent to "str2num('1:10')" (Matlab allows you to omit the single quotes and parentheses when using functions that take character strings as arguments).
Return the 3n+1 sequence for n
Remove all the words that end with "ain"
Knight's Tour Checker
Back to basics - mean of corner elements of a matrix
Compare two input matrices
Return a list sorted by number of occurrences
Find state names that end with the letter A
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