Matrix properties
number of rows	25,503
number of columns	25,503
nonzeros	1,140,977
structural full rank?	yes
structural rank	25,503
# 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	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	2,815,563
Cholesky flop count	5.5e+08
nnz(L+U), no partial pivoting, with AMD	5,605,623
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	6,458,267
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	13,377,102

SVD-based statistics:
norm(A)	8.41287e+07
min(svd(A))	1.22426e-06
cond(A)	6.87178e+13
rank(A)	25,395
sprank(A)-rank(A)	108
null space dimension	108
full numerical rank?	no
singular value gap	1.01335

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.