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.
The Hitchhiker's Guide to MATLAB
Reindex a vector
Magic is simple (for beginners)
Back to basics 17 - white space
Back to basics 12 - Input Arguments
Back to basics 8 - Matrix Diagonals
Back to basics 22 - Rotate a matrix
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