Matrix properties
number of rows	1,473
number of columns	1,473
nonzeros	19,659
structural full rank?	yes
structural rank	1,473
# of blocks from dmperm	10
# strongly connected comp.	10
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	29,270
Cholesky flop count	7.9e+05
nnz(L+U), no partial pivoting, with AMD	57,067
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	38,600
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	73,715

SVD-based statistics:
norm(A)	13.4156
min(svd(A))	2.11871e-05
cond(A)	633196
rank(A)	1,473
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.