Matrix properties
number of rows	50,000
number of columns	50,000
nonzeros	349,968
structural full rank?	yes
structural rank	50,000
# of blocks from dmperm	6
# strongly connected comp.	6
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	N. Gould
editor	N. Gould
date	1995
kind	optimization problem
2D/3D problem?	no

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	4,241,463
Cholesky flop count	3.4e+09
nnz(L+U), no partial pivoting, with AMD	8,432,926
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	4,271,389
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	7,821,888

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.