Matrix properties
number of rows	18,510
number of columns	18,510
nonzeros	145,149
structural full rank?	yes
structural rank	18,510
# of blocks from dmperm	851
# strongly connected comp.	851
explicit zero entries	0
nonzero pattern symmetry	15%
numeric value symmetry	3%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	K. Shen
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	411,269
Cholesky flop count	4.2e+07
nnz(L+U), no partial pivoting, with AMD	804,028
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	31,277,009
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	112,482,360

SVD-based statistics:
norm(A)	1100
min(svd(A))	6.12696e-05
cond(A)	1.79535e+07
rank(A)	18,510
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 (R)) ; where [~,R,E] = spqr (A) with droptol of zero
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.