Matrix properties
number of rows	66,127
number of columns	66,127
nonzeros	1,660,579
structural full rank?	yes
structural rank	66,127
# of blocks from dmperm	1
# strongly connected comp.	1
entries not in dmperm blocks	0
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

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

Additional fields	size and type
coord	full 66127-by-3

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	40,460,476	21,452,065
Cholesky flop count	6.3e+10	1.7e+10
nnz(L+U), no partial pivoting	80,854,825	42,838,003
nnz(V) for QR, upper bound nnz(L) for LU	64,111,504	37,604,285
nnz(R) for QR, upper bound nnz(U) for LU	116,073,102	70,300,134

Maintained by Tim Davis, last updated 04-May-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.