Matrix properties
number of rows	3,937
number of columns	3,937
nonzeros	25,407
structural full rank?	yes
structural rank	3,937
# of blocks from dmperm	351
# strongly connected comp.	290
explicit zero entries	0
nonzero pattern symmetry	85%
numeric value symmetry	0%
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	106,263
Cholesky flop count	7.4e+06
nnz(L+U), no partial pivoting, with AMD	208,589
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	180,406
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	383,950

SVD-based statistics:
norm(A)	3.26618e+11
min(svd(A))	1.62958e-05
cond(A)	2.00431e+16
rank(A)	2,895
sprank(A)-rank(A)	1,042
null space dimension	1,042
full numerical rank?	no
singular value gap	1.02543

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.