Matrix properties
number of rows	15,439
number of columns	15,439
nonzeros	252,241
structural full rank?	yes
structural rank	15,439
# of blocks from dmperm	13
# strongly connected comp.	13
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	1,431,668
Cholesky flop count	2.9e+08
nnz(L+U), no partial pivoting, with AMD	2,847,897
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	2,706,628
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	5,231,397

SVD-based statistics:
norm(A)	1.06002e+15
min(svd(A))	240.157
cond(A)	4.41386e+12
rank(A)	15,435
sprank(A)-rank(A)	4
null space dimension	4
full numerical rank?	no
singular value gap	1.53414

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.