Matrix properties
number of rows	3,402
number of columns	3,402
nonzeros	130,371
structural full rank?	yes
structural rank	3,402
# of blocks from dmperm	3,402
# strongly connected comp.	3,402
explicit zero entries	7,474
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 3402-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	665,212
Cholesky flop count	1.8e+08
nnz(L+U), no partial pivoting, with AMD	1,327,022
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	406,211
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,030,839

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 7474 explicit zero entries.

SVD-based statistics:
norm(A)	3.97745e+14
min(svd(A))	0.0281444
cond(A)	1.41323e+16
rank(A)	2,586
sprank(A)-rank(A)	816
null space dimension	816
full numerical rank?	no
singular value gap	629.254

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.