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 March 2010, Alex Pettyfer was in talks to play the title character in the film, Number Four.[16] It was later confirmed that the 21-year-old British actor would play the lead.[17] Sharlto Copley was going to star as Henri, Number Four's guardian and mentor, but had to drop out due to press obligations with his film The A-Team. Copley was replaced by Timothy Olyphant.[18] Kevin Durand plays the villain of the film, Commander, the Mogadorian who leads the hunt for the Loriens on Earth.[19]