Matrix properties
number of rows	961
number of columns	961
nonzeros	3,405
structural full rank?	no
structural rank	705
# of blocks from dmperm	3
# strongly connected comp.	257
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	36%
type	complex
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	S. Gedney and U. Navasariwala
editor	Z. Bai, D. Day, J. Demmel, J. Dongarra
date	1996
kind	electromagnetics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	6,322
Cholesky flop count	7.5e+04
nnz(L+U), no partial pivoting, with AMD	11,683
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	9,262
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	17,679

SVD-based statistics:
norm(A)	516674
min(svd(A))	0
cond(A)	Inf
rank(A)	705
sprank(A)-rank(A)	0
null space dimension	256
full numerical rank?	no
singular value gap	Inf

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.