Pity that eval is forbidden - I had quite an elegant solution using it.
Remove the polynomials that have positive real elements of their roots.
Return the first and last character of a string
Knights and Knaves (part 3)
nth Rational Number
Wrap a vector, but insert NaN's at the wrap-positions.
Wayfinding 5 - Travel contour
Mmm! Multi-dimensional Matrix Multiplication
Insert structure in a parameter-cell array.
Convert a substructure reference string into a valid definition structure for subsref and subsasgn
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