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Re: matrices in matrices

Look into the standard package LinearAlgebra`MatrixManipulation` for the 
function BlockMatrix. It does what you want.
Gerry F.

mario encinosa wrote:

>i am hoping some of the experts can help me out. i calculate a bunch
>(144 to be precise) of 5 x 5 matrices to be used in an
>eigenvalue/eigenvector calculation in a full 60 x 60 matrix. i cannot
>seem to build the 60 x 60 in a way usable by Eigenvalues and
>Eigenvectors because when I try things like
>mat = {{M11, M12...},  ...}
>with or without Flatten, it leaves the matrix brackets intact. Any
>help would be greatly appreciated!
>Dr. Mario Encinosa
>Associate Professor of Physics
>205 Jones Hall 

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