Matrix properties
number of rows	28,924
number of columns	28,924
nonzeros	2,043,492
structural full rank?	yes
structural rank	28,924
# 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	3,851,984
Cholesky flop count	9.4e+08
nnz(L+U), no partial pivoting, with AMD	7,675,044
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	9,014,851
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	23,003,982

SVD-based statistics:
norm(A)	95.3025
min(svd(A))	0
cond(A)	Inf
rank(A)	8,935
sprank(A)-rank(A)	19,989
null space dimension	19,989
full numerical rank?	no
singular value gap	3.96061e+07

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.