Matrix properties
number of rows	1,083
number of columns	1,083
nonzeros	1,083
structural full rank?	yes
structural rank	1,083
# of blocks from dmperm	1,083
# strongly connected comp.	1,083
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

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	1,083
Cholesky flop count	1.1e+03
nnz(L+U), no partial pivoting, with AMD	1,083
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,083
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,083

SVD-based statistics:
norm(A)	0.00025902
min(svd(A))	2.5902e-08
cond(A)	10000
rank(A)	1,083
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.