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.
Find all elements less than 0 or greater than 10 and replace them with NaN
Remove any row in which a NaN appears
Sum of series I
Number of o rderd pairs of integers (I,J) that can be formed.
Ordered pairs of integers (I, J).
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