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.
Equal to their cube
Area of a triangle
2 b | ~ 2 b
Back to basics 3 - Temp Directory
Valid Chess Moves
Back to basics 6 - Column Vector
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