Matrix properties
number of rows	3,562
number of columns	3,562
nonzeros	159,910
structural full rank?	yes
structural rank	3,562
# 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	1984
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	278,972
Cholesky flop count	3.3e+07
nnz(L+U), no partial pivoting, with AMD	554,382
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	442,201
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	874,492

SVD-based statistics:
norm(A)	3.0692e+13
min(svd(A))	157.461
cond(A)	1.94918e+11
rank(A)	3,562
sprank(A)-rank(A)	0
null space dimension	0
full numerical rank?	yes

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.