Matrix properties
number of rows	32,460
number of columns	32,460
nonzeros	328,036
structural full rank?	yes
structural rank	32,460
# of blocks from dmperm	3
# strongly connected comp.	3
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	binary
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	A. Andrianov
editor	T. Davis
date	2006
kind	optimization problem
2D/3D problem?	no

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	968,227
Cholesky flop count	1.6e+08
nnz(L+U), no partial pivoting, with AMD	1,903,994
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	19,297,162
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	36,796,010

SVD-based statistics:
norm(A)	45.987
min(svd(A))	1.47454e-28
cond(A)	3.11874e+29
rank(A)	31,143
sprank(A)-rank(A)	1,317
null space dimension	1,317
full numerical rank?	no
singular value gap	1.46086e+09

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.