Matrix properties
number of rows	1,919
number of columns	1,919
nonzeros	32,399
structural full rank?	yes
structural rank	1,919
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

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	67,262
Cholesky flop count	3.0e+06
nnz(L+U), no partial pivoting, with AMD	132,605
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	77,872
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	147,384

SVD-based statistics:
norm(A)	2.92164
min(svd(A))	5.44618e-17
cond(A)	5.36456e+16
rank(A)	1,916
sprank(A)-rank(A)	3
null space dimension	3
full numerical rank?	no
singular value gap	64.8543

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.