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
entries not in dmperm blocks	26
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:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	4,348	5,248	4,364
Cholesky flop count	5.6e+04	9.0e+04	5.8e+04
nnz(L+U), no partial pivoting	8,298	10,098	8,356
nnz(V) for QR, upper bound nnz(L) for LU	4,814	6,523	5,238
nnz(R) for QR, upper bound nnz(U) for LU	11,111	14,272	11,242

Maintained by Tim Davis, last updated 04-May-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.