Matrix properties
number of rows	30,401
number of columns	30,401
nonzeros	471,601
structural full rank?	yes
structural rank	30,401
# 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?	yes

author	A. Wathen
editor	N. Gould, Y. Hu, J. Scott
date	2004
kind	random 2D/3D problem
2D/3D problem?	yes

Notes:

rand('state',0); A = gallery('wathen',100,100) ; % (in MATLAB)

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	1,490,209	1,626,583
Cholesky flop count	1.9e+08	1.8e+08
nnz(L+U), no partial pivoting	2,950,017	3,222,765
nnz(V) for QR, upper bound nnz(L) for LU	2,975,942	2,810,797
nnz(R) for QR, upper bound nnz(U) for LU	7,068,015	6,429,496

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.