Matrix properties
number of rows	17,500
number of columns	17,500
nonzeros	114,962
structural full rank?	yes
structural rank	17,500
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	7,500
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	4,028,563
Cholesky flop count	5.0e+09
nnz(L+U), no partial pivoting, with AMD	8,039,626
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	12,079,298
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	29,214,061

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 7500 explicit zero entries.

SVD-based statistics:
norm(A)	96581.1
min(svd(A))	1.35625e-11
cond(A)	7.12119e+15
rank(A)	17,278
sprank(A)-rank(A)	222
null space dimension	222
full numerical rank?	no
singular value gap	1.02112

singular values (MAT file):	click here
SVD method used:	s = svd (full (A)) ;
status:	ok

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.