Matrix properties
number of rows	9,035
number of columns	9,035
nonzeros	335,472
structural full rank?	yes
structural rank	9,035
# of blocks from dmperm	478
# strongly connected comp.	474
explicit zero entries	32
nonzero pattern symmetry	72%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	D. Graham
editor	T. Davis
date	1998
kind	computational fluid dynamics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	602,647
Cholesky flop count	7.0e+07
nnz(L+U), no partial pivoting, with AMD	1,196,259
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,689,616
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	5,071,066

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 32 explicit zero entries.

SVD-based statistics:
norm(A)	82013.1
min(svd(A))	6.74722e-10
cond(A)	1.21551e+14
rank(A)	8,924
sprank(A)-rank(A)	111
null space dimension	111
full numerical rank?	no
singular value gap	1.01525

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.