Matrix properties
number of rows	8,738
number of columns	8,738
nonzeros	591,904
structural full rank?	yes
structural rank	8,738
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	binary
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	R. Cigel, R. Grimes, J. Lewis, E. Meyer
editor	I. Duff, R. Grimes, J. Lewis
date	1986
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	2,571,296
Cholesky flop count	1.2e+09
nnz(L+U), no partial pivoting, with AMD	5,133,854
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	2,710,720
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	7,110,874

SVD-based statistics:
norm(A)	75.8273
min(svd(A))	5.12721e-64
cond(A)	1.47892e+65
rank(A)	3,979
sprank(A)-rank(A)	4,759
null space dimension	4,759
full numerical rank?	no
singular value gap	6.7765e+10

singular values (MAT file):	click here
SVD method used:	s = svd (full (A)) ;
status:	ok

For a description of the statistics displayed above, click here.

Maintained by Tim Davis, last updated 12-Mar-2014.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.