Check if a inputted variable is a number or a string, given a string input (i.e. '1' is 1 and thus a number, 'a' is a string).
Additional test cases have been added.
Create a square matrix of multiples
Sum of series VI
Matrix of almost all zeros, except for main diagonal
determine the sum of the squares
Vector indexing: lower than mean
Find the mean of two vectors
Sum two matrices
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