Matrix properties
number of rows	4,000
number of columns	4,000
nonzeros	8,784
structural full rank?	yes
structural rank	4,000
# of blocks from dmperm	3,983
# strongly connected comp.	3,129
explicit zero entries	0
nonzero pattern symmetry	36%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	S. Godet-Thobie
editor	Z. Bai, D. Day, J. Demmel, J. Dongarra
date	1991
kind	computational fluid dynamics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	8,577
Cholesky flop count	4.1e+04
nnz(L+U), no partial pivoting, with AMD	13,154
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	6,879
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	11,133

SVD-based statistics:
norm(A)	2.3445e+07
min(svd(A))	0.995312
cond(A)	2.35554e+07
rank(A)	4,000
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.