Matrix properties
number of rows	1,050
number of columns	1,050
nonzeros	26,198
structural full rank?	yes
structural rank	1,050
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	2,958
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	28,305
Cholesky flop count	1.0e+06
nnz(L+U), no partial pivoting, with AMD	55,560
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	61,864
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	123,084

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 2958 explicit zero entries.

SVD-based statistics:
norm(A)	2.10093e+07
min(svd(A))	4.58458e-09
cond(A)	4.5826e+15
rank(A)	1,049
sprank(A)-rank(A)	1
null space dimension	1
full numerical rank?	no
singular value gap	3.48931e+07

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.