Pity that eval is forbidden - I had quite an elegant solution using it.
yet another flying fly (YAFF)
Function composition - harder
Volume of a Parallelepiped
Rotate input square matrix 90 degrees CCW without rot90
Make a KITT-scanner on the command line
Convert a substructure reference string into a valid definition structure for subsref and subsasgn
Bleed non-zeros to the right using REGEXP, and that sort of cheatcodess...
Remove element(s) from cell array
Create incremental spiral WITHOUT USING EVAL or FEVAL
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