Matrix properties
number of rows	112
number of columns	112
nonzeros	72
structural full rank?	no
structural rank	72
# of blocks from dmperm	74
# strongly connected comp.	112
explicit zero entries	40
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	J. Lewis
editor	I. Duff, R. Grimes, J. Lewis
date	1982
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	112
Cholesky flop count	1.1e+02
nnz(L+U), no partial pivoting, with AMD	112
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	112
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	112

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 40 explicit zero entries.

SVD-based statistics:
norm(A)	5403.5
min(svd(A))	0
cond(A)	Inf
rank(A)	72
sprank(A)-rank(A)	0
null space dimension	40
full numerical rank?	no
singular value gap	Inf

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.