Matrix properties
number of rows	9,540
number of columns	9,540
nonzeros	207,308
structural full rank?	no
structural rank	9,434
# of blocks from dmperm	207
# strongly connected comp.	382
explicit zero entries	0
nonzero pattern symmetry	59%
numeric value symmetry	13%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	J. Brethour
editor	T. Davis
date	1997
kind	computational fluid dynamics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	689,125
Cholesky flop count	8.2e+07
nnz(L+U), no partial pivoting, with AMD	1,368,710
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,286,324
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	3,780,057

SVD-based statistics:
norm(A)	1216.52
min(svd(A))	7.81585e-34
cond(A)	1.55648e+36
rank(A)	9,426
sprank(A)-rank(A)	8
null space dimension	114
full numerical rank?	no
singular value gap	2.31108

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.