Matrix properties
number of rows	16,860
number of columns	16,860
nonzeros	2,418,804
structural full rank?	yes
structural rank	16,860
# 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	9,848,031
Cholesky flop count	1.1e+10
nnz(L+U), no partial pivoting, with AMD	19,679,202
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	16,994,709
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	43,803,294

SVD-based statistics:
norm(A)	178.748
min(svd(A))	0
cond(A)	Inf
rank(A)	4,834
sprank(A)-rank(A)	12,026
null space dimension	12,026
full numerical rank?	no
singular value gap	6.92143e+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.