Matrix properties
number of rows	72,000
number of columns	72,000
nonzeros	28,715,634
structural full rank?	yes
structural rank	72,000
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	author unknown
editor	T. Davis
date	2003
kind	2D/3D problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	511,595,052
Cholesky flop count	5.6e+12
nnz(L+U), no partial pivoting, with AMD	1,023,118,104
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	456,249,857
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	932,849,973

For a description of the statistics displayed above, click here.

Maintained by Tim Davis, last updated 12-Mar-2014.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.