Matrix properties
number of rows	24,696
number of columns	24,696
nonzeros	1,751,178
structural full rank?	yes
structural rank	24,696
# 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/crystk03

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	12,803,170
Cholesky flop count	1.2e+10
nnz(L+U), no partial pivoting, with AMD	25,581,644
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	11,745,450
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	23,259,357

SVD-based statistics:
norm(A)	77.1044
min(svd(A))	8.40041e-161
cond(A)	9.17865e+161
rank(A)	7,301
sprank(A)-rank(A)	17,395
null space dimension	17,395
full numerical rank?	no
singular value gap	1.25714e+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.