Clarification: For b, with "a string" it seems you accept both string arrays and char arrays. For c, with "matrix" it seems you require a numeric array — this is different from MATLAB's definition of a "matrix".
Thank you David Verrelli. I have modified the problem description to try to reflect that.
Compute a dot product of two vectors x and y
Volume of a Parallelepiped
Construct an index vector from two input vectors in vectorized fashion
Back to basics - array operations
Set x value to each even index of vector y.
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