Matrix properties
number of rows	66
number of columns	66
nonzeros	66
structural full rank?	yes
structural rank	66
# of blocks from dmperm	66
# strongly connected comp.	66
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	66
Cholesky flop count	6.6e+01
nnz(L+U), no partial pivoting, with AMD	66
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	66
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	66

SVD-based statistics:
norm(A)	0.172829
min(svd(A))	0.0197469
cond(A)	8.75217
rank(A)	66
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.