Matrix properties
number of rows	23,052
number of columns	23,052
nonzeros	320,606
structural full rank?	no
structural rank	12,172
# of blocks from dmperm	3
# strongly connected comp.	10,881
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	no
positive definite?	no

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	835,487
Cholesky flop count	1.1e+08
nnz(L+U), no partial pivoting, with AMD	1,647,922
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	2,102,354
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	4,004,046

SVD-based statistics:
norm(A)	0.605385
min(svd(A))	0
cond(A)	Inf
rank(A)	12,172
sprank(A)-rank(A)	0
null space dimension	10,880
full numerical rank?	no
singular value gap	1.33903e+06

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.