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.
Project Euler: Problem 2, Sum of even Fibonacci
Rosenbrock's Banana Function and its derivatives
Set the array elements whose value is 13 to 0
Is it a number?
Find the hypotenuse
Shifted Hexagonal Tiling Dots in a Circle
Chebyshev polynomials of the 2nd Kind
Edges of a n-dimensional Hypercube
Dots in a Diamond
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