Matrix properties
number of rows	9,271
number of columns	9,271
nonzeros	116,587
structural full rank?	yes
structural rank	9,271
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	20,224
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 9271-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	177,647
Cholesky flop count	2.2e+07
nnz(L+U), no partial pivoting, with AMD	346,023
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,654,846
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	2,910,586

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 20224 explicit zero entries.

SVD-based statistics:
norm(A)	252567
min(svd(A))	0.000728339
cond(A)	3.46771e+08
rank(A)	9,271
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.