Matrix properties
number of rows	1,919
number of columns	1,919
nonzeros	9,662
structural full rank?	yes
structural rank	1,919
# of blocks from dmperm	11
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	0%
type	real
structure	skew-symmetric
Cholesky candidate?	no
positive definite?	no

author	J. Lewis
editor	I. Duff, R. Grimes, J. Lewis
date	1975
kind	2D/3D problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	16,733
Cholesky flop count	2.0e+05
nnz(L+U), no partial pivoting, with AMD	31,547
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	31,694
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	66,710

SVD-based statistics:
norm(A)	1.70928
min(svd(A))	8.47117e-17
cond(A)	2.01776e+16
rank(A)	1,918
sprank(A)-rank(A)	1
null space dimension	1
full numerical rank?	no
singular value gap	3.89481e+09

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.