Comment by IshKebab

> I'm not sure if I missed a point you were getting at with this? Lua array table indexes start at 1.

The code example is

    mt = {}          -- create the matrix
    for i=1,N do
      for j=1,M do
        mt[i*M + j] = 0
      end
    end

What index do I use to access the first element in mt? It isn't 1!

If this was written using 0-based indices then the answer would be zero.