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block matrices

To: petsc-users@xxxxxxxxxxx
Subject: block matrices
From: Gideon Simpson <grs2103@xxxxxxxxxxxx>
Date: Sat, 5 Jan 2008 20:54:12 -0500
Reply-to: petsc-users@xxxxxxxxxxx
Sender: owner-petsc-users@xxxxxxxxxxx

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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