Matrix properties
number of rows	2,802
number of columns	2,802
nonzeros	277,362
structural full rank?	no
structural rank	2,694
# of blocks from dmperm	3
# strongly connected comp.	109
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	binary
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	A. Donovan
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	235,158
Cholesky flop count	2.3e+07
nnz(L+U), no partial pivoting, with AMD	467,514
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	241,773
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	525,534

SVD-based statistics:
norm(A)	116.724
min(svd(A))	5.22735e-286
cond(A)	2.23296e+287
rank(A)	289
sprank(A)-rank(A)	2,405
null space dimension	2,513
full numerical rank?	no
singular value gap	8.44752e+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.