Matrix properties
number of rows	1,280
number of columns	1,280
nonzeros	22,778
structural full rank?	yes
structural rank	1,280
# of blocks from dmperm	20
# strongly connected comp.	20
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	complex
structure	Hermitian
Cholesky candidate?	yes
positive definite?	yes

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	12,029
Cholesky flop count	1.5e+05
nnz(L+U), no partial pivoting, with AMD	22,778
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	12,029
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	21,413

SVD-based statistics:
norm(A)	70.322
min(svd(A))	1.48059e-11
cond(A)	4.74959e+12
rank(A)	1,278
sprank(A)-rank(A)	2
null space dimension	2
full numerical rank?	no
singular value gap	41.146

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.