[Axiom-math] Identity Matrix

[panaxiom]

Hi,

is there a command / "shortcut" for creating the identity matrix of a certain 
size?
Or is it necessary to use the matrix()-command and set all the values on the 
diagoanl to one and all others to zero?

Would be much easier, if there is something like identitiymatrix(3),
which would make a 3x3 identity-matrix.

any ideas?

TIA,
  pan.