Your test suite doesn't really match the problem statement. The tests require matrices with *exactly* all elements abot the main diagonal to be 0 *and* all elements on or below the main diagonal to be 1.
Additional test cases have been added.
Running this on octave returns the correct results yet the page still says I'm wrong.
function y = triangMatrix(x)
I copied this code from somewhere.
Return the 3n+1 sequence for n
Find common elements in matrix rows
Replace NaNs with the number that appears to its left in the row.
Set some matrix elements to zero
Back to basics 21 - Matrix replicating
Back to basics 22 - Rotate a matrix
Back to basics 7 - Equal NaNs
Back to basics 16 - byte order
Back to basics 26 - Keywords
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