Matrix properties
number of rows	9,669
number of columns	9,669
nonzeros	67,391
structural full rank?	yes
structural rank	9,669
# of blocks from dmperm	1
# strongly connected comp.	1
entries not in dmperm blocks	0
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	C. Moosmann, A. Griener
editor	E. Rudnyi
date	2004
kind	model reduction problem
2D/3D problem?	yes

Additional fields	size and type
E	sparse 9669-by-9669
B	sparse 9669-by-1
C	sparse 5-by-9669
cname	full 5-by-6

Notes:

Primary matrix in this model reduction problem is the Oberwolfach A matrix

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	295,256	280,871
Cholesky flop count	2.0e+07	1.6e+07
nnz(L+U), no partial pivoting	580,843	552,073
nnz(V) for QR, upper bound nnz(L) for LU	446,297	433,404
nnz(R) for QR, upper bound nnz(U) for LU	828,045	815,273

Maintained by Tim Davis, last updated 30-Sep-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.