Matrix properties
number of rows	675
number of columns	675
nonzeros	3,255
structural full rank?	yes
structural rank	675
# 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	H. Simon
editor	I. Duff, R. Grimes, J. Lewis
date	1982
kind	2D/3D problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	6,453
Cholesky flop count	8.6e+04
nnz(L+U), no partial pivoting, with AMD	12,231
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	9,264
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	16,906

SVD-based statistics:
norm(A)	7.6506e+06
min(svd(A))	1.00002
cond(A)	7.65049e+06
rank(A)	675
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.