Matrix properties
number of rows	2,232
number of columns	2,232
nonzeros	80,352
structural full rank?	no
structural rank	2,208
# of blocks from dmperm	3
# strongly connected comp.	25
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	80,364
Cholesky flop count	3.4e+06
nnz(L+U), no partial pivoting, with AMD	158,496
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	108,834
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	240,276

SVD-based statistics:
norm(A)	40.3553
min(svd(A))	0
cond(A)	Inf
rank(A)	368
sprank(A)-rank(A)	1,840
null space dimension	1,864
full numerical rank?	no
singular value gap	4.88465e+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.