Matrix properties
number of rows	19,998
number of columns	19,998
nonzeros	99,982
structural full rank?	yes
structural rank	19,998
# 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?	yes
positive definite?	yes

author	J. Lienemann, A. Greiner, J. Korvink
editor	E. Rudnyi
date	2004
kind	model reduction problem
2D/3D problem?	yes

Additional fields	size and type
M	sparse 19998-by-19998
E	sparse 19998-by-19998
B	sparse 19998-by-1
C	sparse 1-by-19998

Notes:

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

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	69,988	104,941
Cholesky flop count	2.5e+05	5.5e+05
nnz(L+U), no partial pivoting	119,978	189,884
nnz(V) for QR, upper bound nnz(L) for LU	69,988	119,262
nnz(R) for QR, upper bound nnz(U) for LU	109,976	201,992

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.