Matrix properties
number of rows	1,357
number of columns	1,357
nonzeros	8,985
structural full rank?	yes
structural rank	1,357
# 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 1357-by-1357
B	sparse 1357-by-7
C	sparse 6-by-1357

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'))	11,629	13,223
Cholesky flop count	1.4e+05	2.0e+05
nnz(L+U), no partial pivoting	21,901	25,089
nnz(V) for QR, upper bound nnz(L) for LU	20,824	24,801
nnz(R) for QR, upper bound nnz(U) for LU	42,242	50,128

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.