Matrix properties
number of rows	19,366
number of columns	19,366
nonzeros	134,208
structural full rank?	yes
structural rank	19,366
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	540
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 19366-by-2

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	687,941
Cholesky flop count	7.0e+07
nnz(L+U), no partial pivoting, with AMD	1,356,516
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,093,951
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	2,034,924

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 540 explicit zero entries.

SVD-based statistics:
norm(A)	78142.7
min(svd(A))	1.01558
cond(A)	76944.3
rank(A)	19,366
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.