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.
Getting the absolute index from a matrix
Rotate a Matrix by 90 degrees
find radius of cone
Find the hypotenuse
03 - Matrix Variables 1
Back to basics 8 - Matrix Diagonals
Back to basics 18 - justification
Back to basics 21 - Matrix replicating
Back to basics 11 - Max Integer
Better bullseye matrix
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