Matrix properties
number of rows	179,860
number of columns	179,860
nonzeros	4,598,604
structural full rank?	yes
structural rank	179,860
# of blocks from dmperm	36
# strongly connected comp.	36
entries not in dmperm blocks	3
explicit zero entries	5,514,492
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	C. Damhaug
editor	J. Koster
date	1999
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	60,477,906	54,436,452	55,207,042
Cholesky flop count	9.6e+10	6.8e+10	7.1e+10
nnz(L+U), no partial pivoting	120,775,952	108,693,044	110,234,227
nnz(V) for QR, upper bound nnz(L) for LU	163,166,216	110,500,028	107,291,433
nnz(R) for QR, upper bound nnz(U) for LU	304,811,535	208,301,227	203,092,047

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 5514492 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.