Matrix properties
number of rows	600
number of columns	600
nonzeros	5,660
structural full rank?	yes
structural rank	600
# of blocks from dmperm	151
# strongly connected comp.	151
explicit zero entries	8,100
nonzero pattern symmetry	symmetric
numeric value symmetry	19%
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	21,336
Cholesky flop count	1.2e+06
nnz(L+U), no partial pivoting, with AMD	42,072
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	23,112
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	43,622

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 8100 explicit zero entries.

SVD-based statistics:
norm(A)	4.6856e+09
min(svd(A))	1238.55
cond(A)	3.78313e+06
rank(A)	600
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.