Matrix properties
number of rows	30,235
number of columns	30,235
nonzeros	355,139
structural full rank?	yes
structural rank	30,235
# of blocks from dmperm	42
# strongly connected comp.	42
explicit zero entries	17,074
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 30235-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	389,865
Cholesky flop count	3.4e+07
nnz(L+U), no partial pivoting, with AMD	749,495
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	49,911,958
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	63,499,171

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 17074 explicit zero entries.

SVD-based statistics:
norm(A)	5361.89
min(svd(A))	0.000141322
cond(A)	3.7941e+07
rank(A)	30,235
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.