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).
intersection of matrices
Output any real number that is neither positive nor negative
Wind Chill Computation
Times 3 problem
Area of a circle
Find all elements less than 0 or greater than 10 and replace them with NaN
The Goldbach Conjecture, Part 2
Get the area codes from a list of phone numbers
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