Matrix properties
number of rows	22,401
number of columns	22,401
nonzeros	180,245
structural full rank?	yes
structural rank	22,401
# of blocks from dmperm	3
# strongly connected comp.	3
explicit zero entries	13,380
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 22401-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	341,148
Cholesky flop count	5.2e+07
nnz(L+U), no partial pivoting, with AMD	659,895
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	20,564,894
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	38,976,276

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 13380 explicit zero entries.

SVD-based statistics:
norm(A)	265860
min(svd(A))	1.67639e-05
cond(A)	1.5859e+10
rank(A)	22,401
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 (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.