This is great! I do think you have a formatting error. For me, all matrices appear on one row, like so: > 0 1 2 3 4 5 6 7 8 > The above matrix contains 9 ele

This is great! I do think you have a formatting error. For me, all matrices appear on one row, like so: > 0 1 2 3 4 5 6 7 8 > The above matrix contains 9 elements arranged into 3 rows and 3 columns. You also use / without defining what it does, in day 4.