Matrix properties
number of rows	419
number of columns	419
nonzeros	3,563
structural full rank?	yes
structural rank	419
# 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	G. Everstine, D. Taylor
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	5,013
Cholesky flop count	7.4e+04
nnz(L+U), no partial pivoting, with AMD	9,607
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	6,487
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	13,002

SVD-based statistics:
norm(A)	9.33913
min(svd(A))	1.7301e-19
cond(A)	5.39804e+19
rank(A)	370
sprank(A)-rank(A)	49
null space dimension	49
full numerical rank?	no
singular value gap	1.27309e+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.