Matrix properties
number of rows	1,282
number of columns	1,282
nonzeros	30,644
structural full rank?	yes
structural rank	1,282
# of blocks from dmperm	2
# strongly connected comp.	2
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	R. Kouhia
editor	T. Davis
date	2008
kind	structural problem
2D/3D problem?	yes

Additional fields	size and type
G	sparse 1282-by-1282

Notes:

Matrix problems from Reijo Kouhia, Structural Mechanics, Helsinki  
University of Technology.   http://users.tkk.fi/~kouhia/sparse.html

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	43,827
Cholesky flop count	1.8e+06
nnz(L+U), no partial pivoting, with AMD	86,372
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	44,989
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	85,500

SVD-based statistics:
norm(A)	2.09715e+06
min(svd(A))	1.63415
cond(A)	1.28332e+06
rank(A)	1,282
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.