Matrix properties
number of rows	37,762
number of columns	37,762
nonzeros	1,133,641
structural full rank?	yes
structural rank	37,762
# of blocks from dmperm	773
# strongly connected comp.	773
entries not in dmperm blocks	0
explicit zero entries	28,603
nonzero pattern symmetry	symmetric
numeric value symmetry	28%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	N. Mancktelow
editor	T. Davis
date	2007
kind	materials problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	2,711,148	3,143,965	2,711,148
Cholesky flop count	3.3e+08	4.3e+08	3.3e+08
nnz(L+U), no partial pivoting	5,384,534	6,250,168	5,384,534
nnz(V) for QR, upper bound nnz(L) for LU	6,061,883	5,220,157	5,280,121
nnz(R) for QR, upper bound nnz(U) for LU	14,916,823	11,933,164	12,112,935

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 28603 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.