Matrix properties
number of rows	80,800
number of columns	80,800
nonzeros	542,184
structural full rank?	yes
structural rank	80,800
# 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
editor	N. Gould, Y. Hu, J. Scott
date	2006
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	12,720,302	10,015,614
Cholesky flop count	8.4e+09	5.3e+09
nnz(L+U), no partial pivoting	25,359,804	19,950,428
nnz(V) for QR, upper bound nnz(L) for LU	28,420,466	20,088,576
nnz(R) for QR, upper bound nnz(U) for LU	51,283,650	36,958,540

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.