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.
Sort a list of complex numbers based on far they are from the origin.
Create a two dimensional zero matrix
Calculate a Damped Sinusoid
Ordered pairs of integers (I, J).
Number of o rderd pairs of integers (I,J) that can be formed.
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