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).
Knight's Tour Checker
Right and wrong
Recaman Sequence - I
Determine whether a vector is monotonically increasing
Return the 3n+1 sequence for n
Remove the polynomials that have positive real elements of their roots.
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