Matrix question problem solving

What does the following command return?

[John D'Errico]

Seriously, if this is your homework assignment, then it was given to you to answer, not us.

Answer 1

[John D'Errico]

The most likely answers would be NaN or []. However there are good arguments the answer should be 42.

Answer 2

[drummer]

What did you try so far? =)