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.
Back to basics 3 - Temp Directory
Find nearest prime number less than input number
Test if two numbers have the same digits
Sum the elements in either diagonal of a square matrix
7 segment LED display
Back to basics 24 - Symbolic variables
Back to basics 10 - Max Float
Back to basics 14 - Keywords
Back to basics 13 - Input variables
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