Matrix properties
number of rows	1,224
number of columns	1,224
nonzeros	56,126
structural full rank?	yes
structural rank	1,224
# 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?	no

author	A. Mera, R. Cigel, J. Lewis
editor	I. Duff, R. Grimes, J. Lewis
date	1984
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	55,749
Cholesky flop count	2.7e+06
nnz(L+U), no partial pivoting, with AMD	110,274
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	51,864
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	95,606

SVD-based statistics:
norm(A)	3927.16
min(svd(A))	5.67711e-07
cond(A)	6.91754e+09
rank(A)	1,224
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.