Matrix properties
number of rows	10,848
number of columns	10,848
nonzeros	1,229,776
structural full rank?	yes
structural rank	10,848
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	2
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	1,966,443
Cholesky flop count	5.3e+08
nnz(L+U), no partial pivoting, with AMD	3,922,038
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	4,959,219
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	12,305,436

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 2 explicit zero entries.

SVD-based statistics:
norm(A)	6.29748e+11
min(svd(A))	63.1864
cond(A)	9.96652e+09
rank(A)	10,848
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.