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).
First N Perfect Squares
Reverse the elements of an array
Area of an equilateral triangle
Find a Pythagorean triple
Return a list sorted by number of occurrences
Remove all the consonants
Read a column of numbers and interpolate missing data
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