Matrix properties
number of rows	1,601
number of columns	1,601
nonzeros	31,849
structural full rank?	yes
structural rank	1,601
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	450
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	42,381
Cholesky flop count	1.6e+06
nnz(L+U), no partial pivoting, with AMD	83,161
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	81,117
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	249,139

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 450 explicit zero entries.

SVD-based statistics:
norm(A)	1.56855
min(svd(A))	0.000657236
cond(A)	2386.58
rank(A)	1,601
sprank(A)-rank(A)	0
null space dimension	0
full numerical rank?	yes

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.