Matrix properties
number of rows	3,973
number of columns	3,973
nonzeros	79,077
structural full rank?	yes
structural rank	3,973
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	1,134
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
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	106,907
Cholesky flop count	3.9e+06
nnz(L+U), no partial pivoting, with AMD	209,841
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	224,006
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	727,154

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1134 explicit zero entries.

SVD-based statistics:
norm(A)	128.461
min(svd(A))	2.07391e-16
cond(A)	6.19414e+17
rank(A)	3,972
sprank(A)-rank(A)	1
null space dimension	1
full numerical rank?	no
singular value gap	3.61209e+09

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.