Matrix properties
number of rows	700
number of columns	700
nonzeros	22,175
structural full rank?	no
structural rank	691
# of blocks from dmperm	3
# strongly connected comp.	10
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	binary
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	W. Loden
editor	I. Duff, R. Grimes, J. Lewis
date	1980
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	25,602
Cholesky flop count	1.4e+06
nnz(L+U), no partial pivoting, with AMD	50,504
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	43,525
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	95,260

SVD-based statistics:
norm(A)	42.9785
min(svd(A))	0
cond(A)	Inf
rank(A)	165
sprank(A)-rank(A)	526
null space dimension	535
full numerical rank?	no
singular value gap	3.55124e+11

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.