Matrix properties
number of rows	23,120
number of columns	23,120
nonzeros	1,489,200
structural full rank?	yes
structural rank	23,120
# of blocks from dmperm	2
# strongly connected comp.	2
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	21,359,951
Cholesky flop count	5.6e+10
nnz(L+U), no partial pivoting, with AMD	42,696,782
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	65,795,462
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	116,259,320

SVD-based statistics:
norm(A)	108.913
min(svd(A))	3.51136e-250
cond(A)	3.10174e+251
rank(A)	21,008
sprank(A)-rank(A)	2,112
null space dimension	2,112
full numerical rank?	no
singular value gap	7.04312e+12

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.