Matrix properties
number of rows	5,976
number of columns	5,976
nonzeros	225,046
structural full rank?	no
structural rank	5,882
# of blocks from dmperm	3
# strongly connected comp.	95
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	binary
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	T. Manteuffel
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	498,318
Cholesky flop count	6.8e+07
nnz(L+U), no partial pivoting, with AMD	990,660
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	998,380
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	2,371,267

SVD-based statistics:
norm(A)	41.495
min(svd(A))	0
cond(A)	Inf
rank(A)	2,341
sprank(A)-rank(A)	3,541
null space dimension	3,635
full numerical rank?	no
singular value gap	1.35427e+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.