Matrix properties
number of rows	18,589
number of columns	18,589
nonzeros	128,853
structural full rank?	yes
structural rank	18,589
# of blocks from dmperm	1
# strongly connected comp.	1
entries not in dmperm blocks	0
explicit zero entries	428
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	NASA
editor	G. Kumfert, A. Pothen
date	2003
kind	structural problem
2D/3D problem?	yes

Additional fields	size and type
coord	full 18589-by-2

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	636,443	566,153
Cholesky flop count	6.2e+07	4.0e+07
nnz(L+U), no partial pivoting	1,254,297	1,113,717
nnz(V) for QR, upper bound nnz(L) for LU	1,010,767	935,451
nnz(R) for QR, upper bound nnz(U) for LU	1,890,280	1,752,037

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 428 explicit zero entries.

Maintained by Tim Davis, last updated 30-Sep-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.