Matrix properties
number of rows	37,164
number of columns	37,164
nonzeros	2,205,144
structural full rank?	yes
structural rank	37,164
# 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	P. Chen
editor	T. Davis
date	2002
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	15,324,774
Cholesky flop count	1.8e+10
nnz(L+U), no partial pivoting, with AMD	30,612,384
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	39,505,908
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	76,729,326

SVD-based statistics:
norm(A)	77.6205
min(svd(A))	0
cond(A)	Inf
rank(A)	6,149
sprank(A)-rank(A)	31,015
null space dimension	31,015
full numerical rank?	no
singular value gap	1.94949

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.