Matrix properties
number of rows	389,874
number of columns	389,874
nonzeros	2,097,566
structural full rank?	yes
structural rank	389,874
# of blocks from dmperm	920
# strongly connected comp.	920
entries not in dmperm blocks	0
explicit zero entries	3,676
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	M. Arioli, G. Manzini
editor	N. Gould, Y. Hu, J. Scott
date	2002
kind	2D/3D problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	5,782,318	5,097,961	15,067,790
Cholesky flop count	8.5e+08	4.5e+08	3.2e+09
nnz(L+U), no partial pivoting	11,174,762	9,806,048	29,745,706
nnz(V) for QR, upper bound nnz(L) for LU	20,391,309	15,948,626	15,669,974
nnz(R) for QR, upper bound nnz(U) for LU	49,113,764	40,256,547	39,961,731

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 3676 explicit zero entries.

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.