Matrix properties
number of rows	3,491
number of columns	3,491
nonzeros	160,444
structural full rank?	no
structural rank	3,416
# of blocks from dmperm	3
# strongly connected comp.	76
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	226,325
Cholesky flop count	1.9e+07
nnz(L+U), no partial pivoting, with AMD	449,159
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	387,799
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	725,172

SVD-based statistics:
norm(A)	53.9794
min(svd(A))	8.72163e-128
cond(A)	6.18914e+128
rank(A)	603
sprank(A)-rank(A)	2,813
null space dimension	2,888
full numerical rank?	no
singular value gap	1.87408e+10

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.