Matrix properties
number of rows	8,184
number of columns	8,184
nonzeros	127,762
structural full rank?	yes
structural rank	8,184
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	100%
type	complex
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

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	300,506
Cholesky flop count	1.9e+07
nnz(L+U), no partial pivoting, with AMD	592,828
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	558,566
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,326,827

SVD-based statistics:
norm(A)	2e+13
min(svd(A))	0.00591482
cond(A)	3.38134e+15
rank(A)	654
sprank(A)-rank(A)	7,530
null space dimension	7,530
full numerical rank?	no
singular value gap	1.00303

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.