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
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:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	40,460,476
Cholesky flop count	6.3e+10
nnz(L+U), no partial pivoting, with AMD	80,854,825
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	64,111,504
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	116,073,102

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.