Matrix properties
number of rows	4,515
number of columns	4,515
nonzeros	97,707
structural full rank?	yes
structural rank	4,515
# 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?	yes

author	R. Grimes
editor	T. Davis
date	1995
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	222,496
Cholesky flop count	1.6e+07
nnz(L+U), no partial pivoting, with AMD	440,477
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	268,959
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	517,210

SVD-based statistics:
norm(A)	3.14924e+10
min(svd(A))	13856.4
cond(A)	2.27277e+06
rank(A)	4,515
sprank(A)-rank(A)	0
null space dimension	0
full numerical rank?	yes

singular values (MAT file):	click here
SVD method used:	s = piro_band_svd (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.