Matrix properties
number of rows	4,563
number of columns	4,563
nonzeros	30,927
structural full rank?	yes
structural rank	4,563
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	448
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 4563-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	33,260
Cholesky flop count	6.2e+05
nnz(L+U), no partial pivoting, with AMD	61,957
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	211,163
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	377,809

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 448 explicit zero entries.

SVD-based statistics:
norm(A)	19187
min(svd(A))	0.00110281
cond(A)	1.73982e+07
rank(A)	4,563
sprank(A)-rank(A)	0
null space dimension	0
full numerical rank?	yes

singular values (MAT file):	click here
SVD method used:	s = piro_band_svd (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.