Matrix properties
number of rows	13,681
number of columns	13,681
nonzeros	714,241
structural full rank?	yes
structural rank	13,681
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	integer
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

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

Additional fields	size and type
b	full 13681-by-3

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	1,617,535
Cholesky flop count	2.7e+08
nnz(L+U), no partial pivoting, with AMD	3,221,389
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	6,302,305
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	14,813,011

SVD-based statistics:
norm(A)	321.97
min(svd(A))	1.42335e-113
cond(A)	2.26206e+115
rank(A)	2,243
sprank(A)-rank(A)	11,438
null space dimension	11,438
full numerical rank?	no
singular value gap	5.9994e+10

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.