Matrix properties
number of rows	2,921
number of columns	2,921
nonzeros	20,445
structural full rank?	yes
structural rank	2,921
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	2,240
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	IBM
editor	O. Schenk
date	2006
kind	optimization problem
2D/3D problem?	no

Additional fields	size and type
b	full 2921-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	22,778
Cholesky flop count	6.2e+05
nnz(L+U), no partial pivoting, with AMD	42,635
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	122,244
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	225,453

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 2240 explicit zero entries.

SVD-based statistics:
norm(A)	1.63967e+07
min(svd(A))	1.56184e-05
cond(A)	1.04984e+12
rank(A)	2,921
sprank(A)-rank(A)	0
null space dimension	0
full numerical rank?	yes

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.