Matrix properties
number of rows	33,960
number of columns	33,960
nonzeros	1,583,640
structural full rank?	yes
structural rank	33,960
# 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	P. Chen
editor	T. Davis
date	2002
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	5,345,736
Cholesky flop count	2.0e+09
nnz(L+U), no partial pivoting, with AMD	10,657,512
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	16,244,226
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	31,889,580

SVD-based statistics:
norm(A)	55.3108
min(svd(A))	0
cond(A)	Inf
rank(A)	5,583
sprank(A)-rank(A)	28,377
null space dimension	28,377
full numerical rank?	no
singular value gap	6.47497

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.