Matrix properties
number of rows	1,086
number of columns	1,086
nonzeros	22,092
structural full rank?	yes
structural rank	1,086
# of blocks from dmperm	2
# strongly connected comp.	2
explicit zero entries	0
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:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	23,718
Cholesky flop count	5.7e+05
nnz(L+U), no partial pivoting, with AMD	46,350
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	20,828
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	38,623

SVD-based statistics:
norm(A)	28830.9
min(svd(A))	0.229036
cond(A)	125879
rank(A)	1,086
sprank(A)-rank(A)	0
null space dimension	0
full numerical rank?	yes

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.