Matrix properties
number of rows	3,564
number of columns	3,564
nonzeros	22,316
structural full rank?	yes
structural rank	3,564
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	R. Kendall, D. Peaceman, H. Stone, W. Watts
editor	P. Saylor
date	1984
kind	computational fluid dynamics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	149,197
Cholesky flop count	1.4e+07
nnz(L+U), no partial pivoting, with AMD	294,830
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	279,272
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	506,279

SVD-based statistics:
norm(A)	13273.6
min(svd(A))	0.00193447
cond(A)	6.86162e+06
rank(A)	3,564
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.