Matrix properties
number of rows	30,237
number of columns	30,237
nonzeros	1,450,163
structural full rank?	yes
structural rank	30,237
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	R. Grimes
editor	T. Davis
date	1995
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	2,730,230
Cholesky flop count	3.9e+08
nnz(L+U), no partial pivoting, with AMD	5,430,223
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	7,395,686
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	14,651,764

SVD-based statistics:
norm(A)	4.94924e+09
min(svd(A))	1.11089e-05
cond(A)	4.45522e+14
rank(A)	30,231
sprank(A)-rank(A)	6
null space dimension	6
full numerical rank?	no
singular value gap	686.232

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.