This is because you're assuming 'array' is supposed to mean 'vector' (as in the linear algebraic vector). It isn't, and it's a list -- it's meant to be a contai

This is because you're assuming 'array' is supposed to mean 'vector' (as in the linear algebraic vector). It isn't, and it's a list -- it's meant to be a container. In this case, add meaning concatenate and multiplication meaning self-concatenate multiple times makes sense.