Matrix properties
number of rows	6,316
number of columns	6,316
nonzeros	167,178
structural full rank?	yes
structural rank	6,316
# of blocks from dmperm	6,316
# strongly connected comp.	6,316
explicit zero entries	1,480
nonzero pattern symmetry	0%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Raefsky
editor	H. Simon
date	1993
kind	structural problem
2D/3D problem?	yes

Additional fields	size and type
b	full 6316-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	871,032
Cholesky flop count	1.9e+08
nnz(L+U), no partial pivoting, with AMD	1,735,748
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	335,143
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,329,503

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1480 explicit zero entries.

SVD-based statistics:
norm(A)	2.02494e+11
min(svd(A))	0.000522981
cond(A)	3.87192e+14
rank(A)	1,801
sprank(A)-rank(A)	4,515
null space dimension	4,515
full numerical rank?	no
singular value gap	1.00781

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.