Matrix properties
number of rows	4,800
number of columns	4,800
nonzeros	102,252
structural full rank?	yes
structural rank	4,800
# of blocks from dmperm	8
# strongly connected comp.	8
explicit zero entries	0
nonzero pattern symmetry	77%
numeric value symmetry	27%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Booten, M. Kooper, H. van der Vorst, S. Poedts, J. Goedbloed
editor	Z. Bai, D. Day, J. Demmel, J. Dongarra
date	1994
kind	electromagnetics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	91,765
Cholesky flop count	1.8e+06
nnz(L+U), no partial pivoting, with AMD	178,730
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	188,859
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	344,832

SVD-based statistics:
norm(A)	362870
min(svd(A))	9.3246e-28
cond(A)	3.89153e+32
rank(A)	3,302
sprank(A)-rank(A)	1,498
null space dimension	1,498
full numerical rank?	no
singular value gap	3.13167

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.