Matrix properties
number of rows	15,449
number of columns	15,449
nonzeros	1,930,655
structural full rank?	yes
structural rank	15,449
# 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	5,307,011
Cholesky flop count	3.1e+09
nnz(L+U), no partial pivoting, with AMD	10,598,573
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	7,605,229
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	18,158,849

SVD-based statistics:
norm(A)	161.316
min(svd(A))	2.19333e-98
cond(A)	7.35484e+99
rank(A)	3,442
sprank(A)-rank(A)	12,007
null space dimension	12,007
full numerical rank?	no
singular value gap	1.95167e+10

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.