Diagonal Elements of an Inverse Matrix

Tim Stitt timothy.stitt at ichec.ie
Sun Nov 25 07:18:16 CST 2007

Hi PETSc Users/Developers,

I was just wondering if anyone knew of any O(N) methods for obtaining 
the diagonal elements of the inverse of a block tridiagonal 
matrix,without computing all the off-diagonal values at the same time?

Actually, the general case would be most useful were selected elements 
in the inverse could be obtained in O(N) time.

I would be grateful if anyone could shed any light on this...



Dr. Timothy Stitt <timothy_dot_stitt_at_ichec.ie>
HPC Application Consultant - ICHEC (www.ichec.ie)

Dublin Institute for Advanced Studies
5 Merrion Square - Dublin 2 - Ireland

+353-1-6621333 (tel) / +353-1-6621477 (fax)

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