Matrix properties
number of rows	73,752
number of columns	73,752
nonzeros	2,148,558
structural full rank?	yes
structural rank	73,752
# of blocks from dmperm	17,459
# strongly connected comp.	17,459
entries not in dmperm blocks	0
explicit zero entries	1,448,630
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	J. Weiher
editor	J. Koster
date	2004
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	5,854,658	5,419,581	5,560,025
Cholesky flop count	1.8e+09	1.2e+09	1.3e+09
nnz(L+U), no partial pivoting	11,635,564	10,765,410	11,046,298
nnz(V) for QR, upper bound nnz(L) for LU	19,614,906	12,837,384	13,649,042
nnz(R) for QR, upper bound nnz(U) for LU	41,653,938	27,402,836	28,192,951

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1448630 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.