Matrix properties
number of rows	34,920
number of columns	34,920
nonzeros	3,896,496
structural full rank?	yes
structural rank	34,920
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	747,734
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	C. Damhaug
editor	J. Koster
date	1999
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	16,410,406
Cholesky flop count	1.2e+10
nnz(L+U), no partial pivoting, with AMD	32,785,892
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	20,435,201
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	47,931,029

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 747734 explicit zero entries.

SVD-based statistics:
norm(A)	1.7879e+12
min(svd(A))	0.564658
cond(A)	3.16634e+12
rank(A)	34,888
sprank(A)-rank(A)	32
null space dimension	32
full numerical rank?	no
singular value gap	1.08248

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.