Matrix properties
number of rows	2,339
number of columns	2,339
nonzeros	680,341
structural full rank?	yes
structural rank	2,339
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	2,456
nonzero pattern symmetry	symmetric
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	S. Norris
editor	T. Davis
date	2003
kind	2D/3D problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	886,331
Cholesky flop count	4.0e+08
nnz(L+U), no partial pivoting, with AMD	1,770,323
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,084,402
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	2,261,420

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 2456 explicit zero entries.

SVD-based statistics:
norm(A)	475954
min(svd(A))	0.227484
cond(A)	2.09226e+06
rank(A)	2,339
sprank(A)-rank(A)	0
null space dimension	0
full numerical rank?	yes

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.