Matrix properties
number of rows	131
number of columns	131
nonzeros	536
structural full rank?	yes
structural rank	131
# of blocks from dmperm	65
# strongly connected comp.	48
explicit zero entries	0
nonzero pattern symmetry	70%
numeric value symmetry	2%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	I. Jones
editor	I. Duff, R. Grimes, J. Lewis
date	1982
kind	computational fluid dynamics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	560
Cholesky flop count	3.4e+03
nnz(L+U), no partial pivoting, with AMD	989
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	814
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,728

SVD-based statistics:
norm(A)	9.7721e+09
min(svd(A))	7.64218e-06
cond(A)	1.2787e+15
rank(A)	125
sprank(A)-rank(A)	6
null space dimension	6
full numerical rank?	no
singular value gap	1.95598

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.