Matrix properties
number of rows	18,589
number of columns	18,589
nonzeros	128,853
structural full rank?	yes
structural rank	18,589
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	428
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 18589-by-2

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	636,443
Cholesky flop count	6.2e+07
nnz(L+U), no partial pivoting, with AMD	1,254,297
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,010,767
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,890,280

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 428 explicit zero entries.

SVD-based statistics:
norm(A)	8040.02
min(svd(A))	1.02117
cond(A)	7873.34
rank(A)	18,589
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 (R)) ; where [~,R,E] = spqr (A) with droptol of zero
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.