Matrix properties
number of rows	504,855
number of columns	504,855
nonzeros	17,562,051
structural full rank?	yes
structural rank	504,855
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	26,824
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

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

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

Notes:

next: Schenk_AFE/af_shell2 first: Schenk_AFE/af_shell1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	108,990,904
Cholesky flop count	8.0e+10
nnz(L+U), no partial pivoting, with AMD	217,476,953
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	201,837,552
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	392,881,990

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 26824 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.