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).
Swap the first and last columns
Sum of the Matrix Elements
5 Prime Numbers
Find relatively common elements in matrix rows
Longest Divisor Run
Find the alphabetic word product
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