Matrix properties
number of rows	656
number of columns	656
nonzeros	18,964
structural full rank?	yes
structural rank	656
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	180
nonzero pattern symmetry	symmetric
numeric value symmetry	94%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Baggag, Y. Saad
editor	A. Baggag, Y. Saad
date	1994
kind	computational fluid dynamics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	14,965
Cholesky flop count	4.0e+05
nnz(L+U), no partial pivoting, with AMD	29,274
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	28,262
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	78,247

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 180 explicit zero entries.

SVD-based statistics:
norm(A)	0.514527
min(svd(A))	8.92736e-10
cond(A)	5.76349e+08
rank(A)	656
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.