Matrix properties
number of rows	8,192
number of columns	8,192
nonzeros	41,746
structural full rank?	yes
structural rank	8,192
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	96%
numeric value symmetry	92%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	H. Dong
editor	Z. Bai, D. Day, J. Demmel, J. Dongarra
date	1993
kind	electromagnetics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	212,151
Cholesky flop count	1.9e+07
nnz(L+U), no partial pivoting, with AMD	416,110
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	378,664
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	688,903

SVD-based statistics:
norm(A)	109.828
min(svd(A))	2.87914e-05
cond(A)	3.8146e+06
rank(A)	8,192
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.