Matrix properties
number of rows	4,875
number of columns	4,875
nonzeros	315,891
structural full rank?	yes
structural rank	4,875
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

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

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	960,811
Cholesky flop count	2.6e+08
nnz(L+U), no partial pivoting, with AMD	1,916,747
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,067,304
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	2,148,267

SVD-based statistics:
norm(A)	3.4743e-10
min(svd(A))	1.75648e-26
cond(A)	1.97799e+16
rank(A)	4,869
sprank(A)-rank(A)	6
null space dimension	6
full numerical rank?	no
singular value gap	2.6447e+09

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.