Matrix properties
number of rows	30,200
number of columns	30,200
nonzeros	80,000
structural full rank?	no
structural rank	20,000
# of blocks from dmperm	2
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	integer
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	N. Gould
editor	N. Gould
date	1994
kind	2D/3D problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	257,245
Cholesky flop count	1.2e+07
nnz(L+U), no partial pivoting, with AMD	484,290
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	3,414,104
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	694,211

SVD-based statistics:
norm(A)	2.82809
min(svd(A))	1.15722e-41
cond(A)	2.44386e+41
rank(A)	20,000
sprank(A)-rank(A)	0
null space dimension	10,200
full numerical rank?	no
singular value gap	7.27768e+11

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.