Matrix properties
number of rows	24,300
number of columns	24,300
nonzeros	69,984
structural full rank?	no
structural rank	11,664
# of blocks from dmperm	2
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	integer
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	N. Gould
editor	N. Gould
date	1994
kind	2D/3D problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	552,302
Cholesky flop count	1.4e+08
nnz(L+U), no partial pivoting, with AMD	1,080,304
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	8,584,109
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	2,494,046

SVD-based statistics:
norm(A)	3.45227
min(svd(A))	4.21921e-49
cond(A)	8.18226e+48
rank(A)	11,664
sprank(A)-rank(A)	0
null space dimension	12,636
full numerical rank?	no
singular value gap	8.43642e+12

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.