Matrix properties
number of rows	220,542
number of columns	220,542
nonzeros	9,895,422
structural full rank?	yes
structural rank	220,542
# of blocks from dmperm	9,908
# strongly connected comp.	9,908
entries not in dmperm blocks	0
explicit zero entries	873,014
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'))	24,256,888	24,404,100	24,256,888
Cholesky flop count	7.6e+09	6.9e+09	7.6e+09
nnz(L+U), no partial pivoting	48,293,234	48,587,658	48,293,234
nnz(V) for QR, upper bound nnz(L) for LU	96,966,277	53,811,501	53,898,941
nnz(R) for QR, upper bound nnz(U) for LU	216,940,098	119,307,336	119,828,854

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 873014 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.