Matrix properties
number of rows	1,072
number of columns	1,072
nonzeros	12,444
structural full rank?	yes
structural rank	1,072
# 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	L. Marro
editor	I. Duff, R. Grimes, J. Lewis
date	1981
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	20,548
Cholesky flop count	6.3e+05
nnz(L+U), no partial pivoting, with AMD	40,024
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	44,135
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	112,001

SVD-based statistics:
norm(A)	14.8837
min(svd(A))	1.22513e-34
cond(A)	1.21487e+35
rank(A)	1,050
sprank(A)-rank(A)	22
null space dimension	22
full numerical rank?	no
singular value gap	6.2205e+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.