Matrix properties
number of rows	268
number of columns	268
nonzeros	3,082
structural full rank?	yes
structural rank	268
# 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	L. Marro
editor	I. Duff, R. Grimes, J. Lewis
date	1981
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	3,866
Cholesky flop count	7.0e+04
nnz(L+U), no partial pivoting, with AMD	7,464
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	5,949
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	16,300

SVD-based statistics:
norm(A)	14.4589
min(svd(A))	2.40644e-33
cond(A)	6.00842e+33
rank(A)	261
sprank(A)-rank(A)	7
null space dimension	7
full numerical rank?	no
singular value gap	1.79338e+13

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.