Matrix properties
number of rows	504,855
number of columns	504,855
nonzeros	17,579,155
structural full rank?	yes
structural rank	504,855
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	9,720
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	AutoForm Eng.
editor	O. Schenk
date	2003
kind	subsequent structural problem
2D/3D problem?	yes

Additional fields	size and type
b	full 504855-by-1

Notes:

next: Schenk_AFE/af_shell9 first: Schenk_AFE/af_shell1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	103,109,384
Cholesky flop count	6.8e+10
nnz(L+U), no partial pivoting, with AMD	205,713,913
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	211,044,595
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	411,101,115

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 9720 explicit zero entries.

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.