rank of a unit identity matrix of order 4 is
Identity matrix The identity matrix of a given size is the only idempotent matrix of that size having full rank. That is, it is the only matrix such that (a) when multiplied by itself the result is itself, and (b) all of its rows, and all of its columns, are linearly independent.
I Am Number Four (film) In 2011, screenwriter Noxon told Collider.com that plans for an imminent sequel were shelved due to the disappointing performance of the first installment at the box office.[51][52]