Matrix properties
number of rows	345,241
number of columns	345,241
nonzeros	2,340,859
structural full rank?	yes
structural rank	345,241
# of blocks from dmperm	77
# strongly connected comp.	77
explicit zero entries	152
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 345241-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	72,457,238
Cholesky flop count	3.8e+11
nnz(L+U), no partial pivoting, with AMD	144,569,235
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	5,764,764,512
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	7,781,773,988

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 152 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.