Matrix properties
number of rows	19,242
number of columns	19,242
nonzeros	9,323,432
structural full rank?	yes
structural rank	19,242
# 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	48,387,996
Cholesky flop count	2.5e+11
nnz(L+U), no partial pivoting, with AMD	96,756,750
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	135,423,105
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	185,136,884

SVD-based statistics:
norm(A)	770.814
min(svd(A))	3.01161e-82
cond(A)	2.55947e+84
rank(A)	11,293
sprank(A)-rank(A)	7,949
null space dimension	7,949
full numerical rank?	no
singular value gap	4.08344e+08

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.