Matrix properties
number of rows	3,345
number of columns	3,345
nonzeros	22,749
structural full rank?	yes
structural rank	3,345
# of blocks from dmperm	616
# strongly connected comp.	616
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	binary
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	E. Meyer
editor	I. Duff, R. Grimes, J. Lewis
date	1983
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	36,728
Cholesky flop count	8.2e+05
nnz(L+U), no partial pivoting, with AMD	70,111
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	54,040
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	103,310

SVD-based statistics:
norm(A)	12.1248
min(svd(A))	3.54501e-18
cond(A)	3.42026e+18
rank(A)	3,326
sprank(A)-rank(A)	19
null space dimension	19
full numerical rank?	no
singular value gap	1.31557e+12

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.