Matrix properties
number of rows	398
number of columns	398
nonzeros	3,678
structural full rank?	yes
structural rank	398
# of blocks from dmperm	2
# strongly connected comp.	2
explicit zero entries	0
nonzero pattern symmetry	99%
numeric value symmetry	94%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	B. Schultz, S. Gedney
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	4,348
Cholesky flop count	5.6e+04
nnz(L+U), no partial pivoting, with AMD	8,298
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	4,814
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	11,111

SVD-based statistics:
norm(A)	10.4119
min(svd(A))	0.00347862
cond(A)	2993.11
rank(A)	398
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.