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).
Test for balanced parentheses
03 - Matrix Variables 1
Array of Ones
Sort a list of complex numbers based on far they are from the origin.
Select every other element of a vector
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