Matrix properties
number of rows	398
number of columns	398
nonzeros	2,910
structural full rank?	yes
structural rank	398
# of blocks from dmperm	2
# strongly connected comp.	2
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
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	3,856
Cholesky flop count	4.5e+04
nnz(L+U), no partial pivoting, with AMD	7,314
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	5,034
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	10,604

SVD-based statistics:
norm(A)	3.15194e-05
min(svd(A))	1.49166e-06
cond(A)	21.1304
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.