Matrix properties
number of rows	18,892
number of columns	18,892
nonzeros	497,844
structural full rank?	yes
structural rank	18,892
# 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	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	364,975
Cholesky flop count	1.3e+07
nnz(L+U), no partial pivoting, with AMD	711,058
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	619,679
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,441,462

SVD-based statistics:
norm(A)	228.084
min(svd(A))	1.90802e-63
cond(A)	1.19539e+65
rank(A)	14,569
sprank(A)-rank(A)	4,323
null space dimension	4,323
full numerical rank?	no
singular value gap	2.86106e+09

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.