Everyone, I've modified the test suite such that common cheats won't work; i.e., regexp/rep, interp1/2/3, num2str, str2num, etc. are disallowed! General numerical solutions, however, are most welcome.
Make a checkerboard matrix
Getting logical indexes
Fill a zeros matrix
Split a string into chunks of specified length
Output any real number that is neither positive nor negative
Shifted Hexagonal Tiling Dots in a Circle
Dots in a Diamond
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