Matrix properties
number of rows	17,546
number of columns	17,546
nonzeros	121,550
structural full rank?	yes
structural rank	17,546
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	388
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	NASA
editor	G. Kumfert, A. Pothen
date	2003
kind	structural problem
2D/3D problem?	yes

Additional fields	size and type
coord	full 17546-by-2

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	572,607
Cholesky flop count	5.2e+07
nnz(L+U), no partial pivoting, with AMD	1,127,668
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	904,977
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,686,085

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 388 explicit zero entries.

SVD-based statistics:
norm(A)	832.222
min(svd(A))	1.03268
cond(A)	805.886
rank(A)	17,546
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.