Find the pattern for the element of the matrix.
mat_pattern(2) = [
4 7
5 8];
mat_pattern(4) = [
4 7 10 13
5 8 11 14
6 9 12 15
7 10 13 16];
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Doddy -- I think the last two columns of y_correct in problem 4 are incorrect.
@William , I think it is correct.
Binbin -- Yes, I see. It's just a more difficult problem than I thought it was!
@William， Yes. It is hard to guess the author's thoughts
tip: pi is used as a factor.
Can confirm that Rafael's hint proved vital to arriving at a solution that 1) works on all the cases in the test suite and 2) relies on the hidden pattern. Not all accepted solutions accomplished the latter.