Matrix properties
number of rows	61
number of columns	61
nonzeros	557
structural full rank?	yes
structural rank	61
# 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	361
Cholesky flop count	2.2e+03
nnz(L+U), no partial pivoting, with AMD	661
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	434
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,017

SVD-based statistics:
norm(A)	10.9467
min(svd(A))	1.09402e-32
cond(A)	1.00059e+33
rank(A)	49
sprank(A)-rank(A)	12
null space dimension	12
full numerical rank?	no
singular value gap	4.99786e+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.