Matrix properties
number of rows	13,992
number of columns	13,992
nonzeros	619,488
structural full rank?	yes
structural rank	13,992
# of blocks from dmperm	28
# strongly connected comp.	28
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	1,785,692
Cholesky flop count	4.7e+08
nnz(L+U), no partial pivoting, with AMD	3,557,392
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	3,045,985
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	6,149,099

SVD-based statistics:
norm(A)	51.737
min(svd(A))	7.2798e-74
cond(A)	7.10693e+74
rank(A)	10,006
sprank(A)-rank(A)	3,986
null space dimension	3,986
full numerical rank?	no
singular value gap	4.49854e+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.