Matrix properties
number of rows	1,280
number of columns	1,280
nonzeros	47,906
structural full rank?	yes
structural rank	1,280
# of blocks from dmperm	15
# strongly connected comp.	15
explicit zero entries	0
nonzero pattern symmetry	90%
numeric value symmetry	31%
type	complex
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

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	38,984
Cholesky flop count	1.3e+06
nnz(L+U), no partial pivoting, with AMD	76,688
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	160,961
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	308,785

SVD-based statistics:
norm(A)	79441.7
min(svd(A))	1.94436e-20
cond(A)	4.08576e+24
rank(A)	963
sprank(A)-rank(A)	317
null space dimension	317
full numerical rank?	no
singular value gap	18.1105

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.