Matrix properties
number of rows	23,052
number of columns	23,052
nonzeros	1,142,686
structural full rank?	yes
structural rank	23,052
# of blocks from dmperm	1
# strongly connected comp.	1
entries not in dmperm blocks	0
explicit zero entries	12,128
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	R. Grimes
editor	T. Davis
date	1995
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	2,777,057	2,929,060
Cholesky flop count	6.3e+08	6.2e+08
nnz(L+U), no partial pivoting	5,531,062	5,835,068
nnz(V) for QR, upper bound nnz(L) for LU	7,670,285	5,960,721
nnz(R) for QR, upper bound nnz(U) for LU	15,776,044	11,445,080

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 12128 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.