Matrix properties
number of rows	3,312
number of columns	3,312
nonzeros	20,793
structural full rank?	yes
structural rank	3,312
# of blocks from dmperm	1,675
# strongly connected comp.	1,675
explicit zero entries	0
nonzero pattern symmetry	74%
numeric value symmetry	15%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Sherman
editor	I. Duff, R. Grimes, J. Lewis
date	1984
kind	computational fluid dynamics problem
2D/3D problem?	yes

Additional fields	size and type
b	full 3312-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	78,567
Cholesky flop count	6.1e+06
nnz(L+U), no partial pivoting, with AMD	153,822
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	94,649
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	189,297

SVD-based statistics:
norm(A)	4547.51
min(svd(A))	0.0241965
cond(A)	187941
rank(A)	3,312
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.