Matrix properties
number of rows	2,146
number of columns	2,146
nonzeros	72,250
structural full rank?	yes
structural rank	2,146
# 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	NASA
editor	G. Kumfert, A. Pothen
date	1995
kind	structural problem
2D/3D problem?	yes

Additional fields	size and type
b	full 2146-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	139,943
Cholesky flop count	1.2e+07
nnz(L+U), no partial pivoting, with AMD	277,740
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	240,781
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	473,182

SVD-based statistics:
norm(A)	3.27282e+07
min(svd(A))	18980.2
cond(A)	1724.34
rank(A)	2,146
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.