block matrices
Barry Smith
bsmith at mcs.anl.gov
Sun Jan 6 07:40:29 CST 2008
Gideon,
It really depends on what you want to use this new matrix for? If
you wish to do
matrix vector products with it then I would suggest making a shell
matrix that then
calls the matrix vector product on each part. In other words, if
possible you probably
want to avoid explicitly constructing this entire new matrix, unless
you really need
it.
Barry
On Jan 5, 2008, at 7:54 PM, Gideon Simpson wrote:
> Suppose I have two sparse matrices A and Q and now I want to
> construct a block diagonal matrix, K,
>
> K = [A,0]
> [0,Q]
>
> What is the "right" way to do this is?
>
>
> -Gideon Simpson
> Department of Applied Physics and Applied Mathematics
> Columbia University
>
>
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