Matrix properties
number of rows	132
number of columns	132
nonzeros	66
structural full rank?	no
structural rank	66
# of blocks from dmperm	68
# strongly connected comp.	132
explicit zero entries	66
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	132
Cholesky flop count	1.3e+02
nnz(L+U), no partial pivoting, with AMD	132
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	132
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	132

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 66 explicit zero entries.

SVD-based statistics:
norm(A)	0.172829
min(svd(A))	0
cond(A)	Inf
rank(A)	66
sprank(A)-rank(A)	0
null space dimension	66
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.