Matrix properties
number of rows	13,965
number of columns	13,965
nonzeros	968,583
structural full rank?	yes
structural rank	13,965
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	binary
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	R. Grimes
editor	T. Davis
date	1995
kind	duplicate materials problem
2D/3D problem?	yes

Notes:

This matrix is the nonzero pattern of Boeing/crystk02

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	6,118,928
Cholesky flop count	4.5e+09
nnz(L+U), no partial pivoting, with AMD	12,223,891
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	5,340,099
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	10,693,425

SVD-based statistics:
norm(A)	76.0444
min(svd(A))	2.66037e-82
cond(A)	2.85841e+83
rank(A)	4,624
sprank(A)-rank(A)	9,341
null space dimension	9,341
full numerical rank?	no
singular value gap	4.61781e+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.