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.
Remove all the consonants
Generate a random matrix A of (1,-1)
Sum of the Matrix Elements
Back to basics 7 - Equal NaNs
Back to basics 21 - Matrix replicating
Back to basics 2 - Function Path
Back to basics 9 - Indexed References
Better bullseye matrix
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