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.
Determine if input is odd
letter yes yes & letter no no
Set some matrix elements to zero
Circular Primes (based on Project Euler, problem 35)
sum of non-primes
Radial Zernike polynomials
Triangular Tiling Dots in a Circle
Dots in a Circle
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