Matrix properties
number of rows	5,962
number of columns	5,962
nonzeros	142,190
structural full rank?	yes
structural rank	5,962
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	5%
type	complex
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	A. Cote
editor	T. Davis
date	1997
kind	acoustics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	2,017,574
Cholesky flop count	1.3e+09
nnz(L+U), no partial pivoting, with AMD	4,029,186
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	2,739,174
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	4,640,941

SVD-based statistics:
norm(A)	1.04508e+06
min(svd(A))	3.11355e-11
cond(A)	3.35654e+16
rank(A)	4,103
sprank(A)-rank(A)	1,859
null space dimension	1,859
full numerical rank?	no
singular value gap	1.24449e+06

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.