You really shouldn't give away the answer in the test suite. ;-)
You could change the test suite to something like:
assert (str2num(fliplr(num2str(y))) == y*4);
Although this also sort of gives away one possible solution.
Inner product of two vectors
Make one big string out of two smaller strings
Return 'on' or 'off'
Determine the square root
Number of o rderd pairs of integers (I,J) that can be formed.
Ordered pairs of integers (I, J).
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