Matrix properties
number of rows	1,409
number of columns	1,409
nonzeros	42,760
structural full rank?	yes
structural rank	1,409
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	943
nonzero pattern symmetry	symmetric
numeric value symmetry	94%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Baggag, Y. Saad
editor	A. Baggag, Y. Saad
date	1994
kind	computational fluid dynamics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	39,444
Cholesky flop count	1.4e+06
nnz(L+U), no partial pivoting, with AMD	77,479
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	55,879
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	186,988

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 943 explicit zero entries.

SVD-based statistics:
norm(A)	267248
min(svd(A))	1.57611e-08
cond(A)	1.69561e+13
rank(A)	1,408
sprank(A)-rank(A)	1
null space dimension	1
full numerical rank?	no
singular value gap	6.99388

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.