Matrix properties
number of rows	30,003
number of columns	30,003
nonzeros	109,999
structural full rank?	no
structural rank	30,002
# of blocks from dmperm	20,003
# strongly connected comp.	2
explicit zero entries	10,001
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	J. Blowey
editor	N. Gould
date	1992
kind	materials problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	99,999	130,347
Cholesky flop count	3.6e+05	6.6e+05
nnz(L+U), no partial pivoting	169,995	230,691
nnz(V) for QR, upper bound nnz(L) for LU	25,265,189	-
nnz(R) for QR, upper bound nnz(U) for LU	50,370,433	-

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 10001 explicit zero entries.

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.