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.
Duplicate each element of a vector.
Matlab Basics II - squares
Convert Hard Drive marketing sizes to actual data sizes
2 b | ~ 2 b
Back to basics 18 - justification
Better bullseye matrix
Back to basics 13 - Input variables
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