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?	yes
positive definite?	no

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

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	132	132
Cholesky flop count	1.3e+02	1.3e+02
nnz(L+U), no partial pivoting	132	132
nnz(V) for QR, upper bound nnz(L) for LU	132	132
nnz(R) for QR, upper bound nnz(U) for LU	132	132

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

Maintained by Tim Davis, last updated 04-May-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.