Matrix properties
number of rows	11,445
number of columns	11,445
nonzeros	176,117
structural full rank?	yes
structural rank	11,445
# 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	E. Rudnyi
editor	E. Rudnyi
date	2004
kind	model reduction problem
2D/3D problem?	yes

Additional fields	size and type
E	sparse 11445-by-11445
B	sparse 11445-by-1
C	sparse 7-by-11445
cname	full 7-by-7

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'))	491,255	485,428
Cholesky flop count	4.1e+07	3.4e+07
nnz(L+U), no partial pivoting	971,065	959,411
nnz(V) for QR, upper bound nnz(L) for LU	841,710	828,621
nnz(R) for QR, upper bound nnz(U) for LU	2,001,083	1,881,241

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.