Matrix properties
number of rows	8,205
number of columns	8,205
nonzeros	125,567
structural full rank?	yes
structural rank	8,205
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	W. Eversman, D. Okunbor
editor	T. Davis
date	2001
kind	acoustics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	289,180
Cholesky flop count	1.7e+07
nnz(L+U), no partial pivoting, with AMD	570,155
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	517,970
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,234,184

SVD-based statistics:
norm(A)	1e+15
min(svd(A))	0.000227942
cond(A)	4.38709e+18
rank(A)	1
sprank(A)-rank(A)	8,204
null space dimension	8,204
full numerical rank?	no

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.