Matrix properties
number of rows	1,440
number of columns	1,440
nonzeros	44,998
structural full rank?	yes
structural rank	1,440
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	1,272
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	R. Grimes
editor	T. Davis
date	1995
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	113,509
Cholesky flop count	1.2e+07
nnz(L+U), no partial pivoting, with AMD	225,578
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	210,689
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	405,343

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1272 explicit zero entries.

SVD-based statistics:
norm(A)	1.35659e+06
min(svd(A))	0.410358
cond(A)	3.30588e+06
rank(A)	1,440
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.