Matrix properties
number of rows	1,856
number of columns	1,856
nonzeros	11,360
structural full rank?	yes
structural rank	1,856
# of blocks from dmperm	129
# strongly connected comp.	129
explicit zero entries	0
nonzero pattern symmetry	99%
numeric value symmetry	99%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	J. Somerville
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	54,606
Cholesky flop count	3.4e+06
nnz(L+U), no partial pivoting, with AMD	107,356
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	103,839
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	186,864

SVD-based statistics:
norm(A)	1
min(svd(A))	2.29377e-10
cond(A)	4.35964e+09
rank(A)	1,856
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.