Matrix properties
number of rows	22,209
number of columns	22,209
nonzeros	3,226,671
structural full rank?	yes
structural rank	22,209
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	binary
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	P. Chen
editor	T. Davis
date	2002
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	14,680,191
Cholesky flop count	2.0e+10
nnz(L+U), no partial pivoting, with AMD	29,338,173
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	28,946,745
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	73,091,064

SVD-based statistics:
norm(A)	180.348
min(svd(A))	0
cond(A)	Inf
rank(A)	6,552
sprank(A)-rank(A)	15,657
null space dimension	15,657
full numerical rank?	no
singular value gap	2.65124e+10

singular values (MAT file):	click here
SVD method used:	s = svd (full (R)) ; where [~,R,E] = spqr (A) with droptol of zero
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.