Assigning a submatrix to an existing matrix

[deSitter]

Hello Prime numbers,

How do I say put a 2x2 matrix into an existing 4x4 matrix? Say I want to overwrite the elements in rows 1,2 and columns 3,4 with a 2x2 matrix - can I do this by direct assignment? Thanks in advance.

Many more questions coming, hope this isn't spam.

While I'm here - is there an outer product function? e.g. if you have a 2x3 array and a 3x4 array you create a 2x3x3x4 4-d array from a pair of 2-d arrays. I am working on an iterative construction of all Clifford algebras. Simple example is outer product of 2 vectors U_i, V_j then

(U outer V)_ij = U_i V*_j

where * = complex conjugate. Thanks.

-drl