Matrix properties
number of rows	3,200
number of columns	3,200
nonzeros	68,026
structural full rank?	yes
structural rank	3,200
# 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	61,066
Cholesky flop count	1.2e+06
nnz(L+U), no partial pivoting, with AMD	118,932
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	123,175
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	221,646

SVD-based statistics:
norm(A)	160740
min(svd(A))	9.53863e-27
cond(A)	1.68515e+31
rank(A)	2,244
sprank(A)-rank(A)	956
null space dimension	956
full numerical rank?	no
singular value gap	1.01617

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.