Matrix properties
number of rows	240
number of columns	240
nonzeros	2,248
structural full rank?	yes
structural rank	240
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	1,514
nonzero pattern symmetry	symmetric
numeric value symmetry	27%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	R. Grimes
editor	I. Duff, R. Grimes, J. Lewis
date	1983
kind	computational fluid dynamics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	5,128
Cholesky flop count	1.6e+05
nnz(L+U), no partial pivoting, with AMD	10,016
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	4,691
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	8,498

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1514 explicit zero entries.

SVD-based statistics:
norm(A)	2.1712e+07
min(svd(A))	0.767886
cond(A)	2.8275e+07
rank(A)	240
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.