Matrix properties
number of rows	4,960
number of columns	4,960
nonzeros	19,848
structural full rank?	yes
structural rank	4,960
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	4,036
nonzero pattern symmetry	symmetric
numeric value symmetry	31%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	S. Hamm
editor	T. Davis
date	1991
kind	circuit simulation problem
2D/3D problem?	no

Additional fields	size and type
b	full 4960-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	14,377
Cholesky flop count	4.3e+04
nnz(L+U), no partial pivoting, with AMD	23,794
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	19,873
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	40,695

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 4036 explicit zero entries.

SVD-based statistics:
norm(A)	0.0574932
min(svd(A))	0.00042065
cond(A)	136.677
rank(A)	4,960
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.