Matrix properties
number of rows	43,640
number of columns	43,640
nonzeros	298,570
structural full rank?	yes
structural rank	43,640
# of blocks from dmperm	5
# strongly connected comp.	5
explicit zero entries	8
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	IBM
editor	O. Schenk
date	2006
kind	optimization problem
2D/3D problem?	no

Additional fields	size and type
b	full 43640-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	1,323,109
Cholesky flop count	6.5e+08
nnz(L+U), no partial pivoting, with AMD	2,602,578
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	57,483,448
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	78,251,773

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 8 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.