Matrix properties
number of rows	3,909
number of columns	3,909
nonzeros	91,223
structural full rank?	yes
structural rank	3,909
# of blocks from dmperm	2
# strongly connected comp.	2
explicit zero entries	24,134
nonzero pattern symmetry	symmetric
numeric value symmetry	73%
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	127,797
Cholesky flop count	5.7e+06
nnz(L+U), no partial pivoting, with AMD	251,685
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	320,164
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	969,014

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 24134 explicit zero entries.

SVD-based statistics:
norm(A)	22.7673
min(svd(A))	7.93678e-05
cond(A)	286858
rank(A)	3,909
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.