Matrix properties
number of rows	22,098
number of columns	22,098
nonzeros	1,935,324
structural full rank?	yes
structural rank	22,098
# 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	C. Damhaug
editor	N. Gould, Y. Hu, J. Scott
date	2004
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	1,708,287
Cholesky flop count	1.6e+08
nnz(L+U), no partial pivoting, with AMD	3,394,476
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	7,074,375
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	21,764,103

SVD-based statistics:
norm(A)	104.629
min(svd(A))	0
cond(A)	Inf
rank(A)	2,819
sprank(A)-rank(A)	19,279
null space dimension	19,279
full numerical rank?	no
singular value gap	4.9741e+11

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.