Matrix properties
number of rows	1,086
number of columns	1,086
nonzeros	22,070
structural full rank?	yes
structural rank	1,086
# of blocks from dmperm	2
# strongly connected comp.	2
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. Lewis
editor	I. Duff, R. Grimes, J. Lewis
date	1982
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	23,689	27,650	23,689
Cholesky flop count	5.7e+05	8.6e+05	5.7e+05
nnz(L+U), no partial pivoting	46,292	54,214	46,292
nnz(V) for QR, upper bound nnz(L) for LU	20,786	32,592	21,604
nnz(R) for QR, upper bound nnz(U) for LU	38,611	57,679	38,817

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.