Matrix properties
number of rows	23,052
number of columns	23,052
nonzeros	1,142,686
structural full rank?	yes
structural rank	23,052
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	12,128
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	2,777,057
Cholesky flop count	6.3e+08
nnz(L+U), no partial pivoting, with AMD	5,531,062
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	7,670,285
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	15,776,044

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 12128 explicit zero entries.

SVD-based statistics:
norm(A)	7.10158e+08
min(svd(A))	0.000955374
cond(A)	7.43329e+11
rank(A)	23,020
sprank(A)-rank(A)	32
null space dimension	32
full numerical rank?	no
singular value gap	1.03425

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.