Matrix properties
number of rows	3,200
number of columns	3,200
nonzeros	18,316
structural full rank?	yes
structural rank	3,200
# of blocks from dmperm	14
# strongly connected comp.	14
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
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	10,758
Cholesky flop count	4.0e+04
nnz(L+U), no partial pivoting, with AMD	18,316
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	10,758
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	18,672

SVD-based statistics:
norm(A)	2.19627
min(svd(A))	1.36926e-13
cond(A)	1.60398e+13
rank(A)	3,199
sprank(A)-rank(A)	1
null space dimension	1
full numerical rank?	no
singular value gap	41.1467

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.