Matrix properties
number of rows	35,588
number of columns	35,588
nonzeros	1,181,416
structural full rank?	yes
structural rank	35,588
# of blocks from dmperm	2
# strongly connected comp.	2
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	5,568,754
Cholesky flop count	2.9e+09
nnz(L+U), no partial pivoting, with AMD	11,101,920
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	12,371,674
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	24,526,717

SVD-based statistics:
norm(A)	57.9691
min(svd(A))	3.98742e-234
cond(A)	1.4538e+235
rank(A)	16,803
sprank(A)-rank(A)	18,785
null space dimension	18,785
full numerical rank?	no
singular value gap	2.84072e+08

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.