Matrix properties
number of rows	416
number of columns	416
nonzeros	8,562
structural full rank?	yes
structural rank	416
# 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	7,647
Cholesky flop count	1.5e+05
nnz(L+U), no partial pivoting, with AMD	14,878
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	14,481
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	24,034

SVD-based statistics:
norm(A)	2542.59
min(svd(A))	1.50626e-21
cond(A)	1.68802e+24
rank(A)	322
sprank(A)-rank(A)	94
null space dimension	94
full numerical rank?	no
singular value gap	1.09239

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.