2D printing incomplete

[Arno K]

I would use [[a,b],[c,d]](1,1) that provides correct answers and does not change indices, interestingly at() is not in the helpfiles and manually entered before your input it provides a double at in history, that is output is at(a). So I think it is not thought to be used with matrices, perhaps it is thout to be used with strings and there converts indices to standard C/C++ counts, starting with zero."abc"[1] provides "a", in history at(...) is read. Manually entering at simply does not work with strings, lists and matrices.
Arno