Matrix properties
number of rows	5,177
number of columns	5,177
nonzeros	35,185
structural full rank?	yes
structural rank	5,177
# 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	P. Benner, J. Saak
editor	E. Rudnyi
date	2002
kind	model reduction problem
2D/3D problem?	yes

Additional fields	size and type
E	sparse 5177-by-5177
B	sparse 5177-by-7
C	sparse 6-by-5177

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'))	61,746	70,363
Cholesky flop count	1.4e+06	1.9e+06
nnz(L+U), no partial pivoting	118,315	135,549
nnz(V) for QR, upper bound nnz(L) for LU	128,813	145,046
nnz(R) for QR, upper bound nnz(U) for LU	276,474	303,021

Maintained by Tim Davis, last updated 04-May-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.