Matrix properties
number of rows	11,107
number of columns	11,107
nonzeros	378,927
structural full rank?	yes
structural rank	11,107
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	100%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Cunningham
editor	T. Davis
date	2002
kind	acoustics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	774,049
Cholesky flop count	8.2e+07
nnz(L+U), no partial pivoting, with AMD	1,536,991
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,152,498
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	2,342,542

SVD-based statistics:
norm(A)	1.99511e+10
min(svd(A))	1.32696e-08
cond(A)	1.50352e+18
rank(A)	11,101
sprank(A)-rank(A)	6
null space dimension	6
full numerical rank?	no
singular value gap	765.134

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.