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.
Determine whether a vector is monotonically increasing
Test for balanced parentheses
How to find the position of an element in a vector without using the find function
Filter AC, pass DC
05 - Vector Equations 2
Back to basics 9 - Indexed References
Back to basics 26 - Keywords
Back to basics 15 - Benchmark
Back to basics 8 - Matrix Diagonals
7 segment LED display
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