Matrix properties
number of rows	169,410
number of columns	169,410
nonzeros	5,033,796
structural full rank?	yes
structural rank	169,410
# of blocks from dmperm	2
# strongly connected comp.	2
explicit zero entries	2,492
nonzero pattern symmetry	symmetric
numeric value symmetry	82%
type	complex
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	M. Gontier
editor	T. Davis
date	2008
kind	acoustics problem
2D/3D problem?	yes

Notes:

Free Field Technologies, Mont-Saint Guibert, Belguim (http://www.fft.be)

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	159,387,111
Cholesky flop count	6.1e+11
nnz(L+U), no partial pivoting, with AMD	318,604,812
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	335,777,284
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	775,211,698

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 2492 explicit zero entries.

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.