Matrix properties
number of rows	1,224
number of columns	1,224
nonzeros	9,613
structural full rank?	yes
structural rank	1,224
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	61%
numeric value symmetry	39%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	J. Appleyard
editor	I. Duff, R. Grimes, J. Lewis
date	1980
kind	computational fluid dynamics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	40,035
Cholesky flop count	2.6e+06
nnz(L+U), no partial pivoting, with AMD	78,846
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	26,919
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	48,778

SVD-based statistics:
norm(A)	6.08895e+07
min(svd(A))	0.556428
cond(A)	1.09429e+08
rank(A)	1,224
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.