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.
Omit columns averages from a matrix
Generate N equally spaced intervals between -L and L
05 - Vector Equations 1
Sum the 'edge' values of a matrix
Back to basics 15 - classes
Convert Roman to Arabic Numerals
Back to basics 9 - Indexed References
Back to basics 8 - Matrix Diagonals
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