Matrix properties
number of rows	2,873
number of columns	2,873
nonzeros	1,314
structural full rank?	no
structural rank	266
# of blocks from dmperm	84
# strongly connected comp.	2,650
explicit zero entries	25,877
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	S. Zenios
editor	I. Duff, R. Grimes, J. Lewis
date	1985
kind	optimization problem
2D/3D problem?	no

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	3,546
Cholesky flop count	7.3e+03
nnz(L+U), no partial pivoting, with AMD	4,219
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	3,507
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	3,862

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 25877 explicit zero entries.

SVD-based statistics:
norm(A)	3.33795
min(svd(A))	0
cond(A)	Inf
rank(A)	265
sprank(A)-rank(A)	1
null space dimension	2,608
full numerical rank?	no
singular value gap	5827.89

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.