Matrix properties
number of rows	23,052
number of columns	23,052
nonzeros	1,143,140
structural full rank?	yes
structural rank	23,052
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

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

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	2,732,511
Cholesky flop count	6.2e+08
nnz(L+U), no partial pivoting, with AMD	5,441,970
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	7,616,171
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	15,718,121

SVD-based statistics:
norm(A)	1.77539e+08
min(svd(A))	0.00023885
cond(A)	7.43309e+11
rank(A)	23,020
sprank(A)-rank(A)	32
null space dimension	32
full numerical rank?	no
singular value gap	1.02847

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.