Matrix properties
number of rows	2,003
number of columns	2,003
nonzeros	21,181
structural full rank?	no
structural rank	1,241
# of blocks from dmperm	574
# strongly connected comp.	1,334
explicit zero entries	762
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	J. Lewis
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	44,844
Cholesky flop count	4.2e+06
nnz(L+U), no partial pivoting, with AMD	87,685
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	50,629
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	99,266

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 762 explicit zero entries.

SVD-based statistics:
norm(A)	257.927
min(svd(A))	0
cond(A)	Inf
rank(A)	1,241
sprank(A)-rank(A)	0
null space dimension	762
full numerical rank?	no
singular value gap	6.62076e+11

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.