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.
Relative ratio of "1" in binary number
Compare two input matrices
Add a block to a model
2 b | ~ 2 b
Back to basics 3 - Temp Directory
Toolbox check part 3
Back to basics 1 - Saving
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