Matrix properties
number of rows	3,242
number of columns	3,242
nonzeros	293,551
structural full rank?	yes
structural rank	3,242
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	725
nonzero pattern symmetry	symmetric
numeric value symmetry	10%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Raefsky
editor	H. Simon
date	1993
kind	subsequent computational fluid dynamics problem
2D/3D problem?	yes

Additional fields	size and type
b	full 3242-by-1

Notes:

next: - first: Simon/raefsky1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	1,123,931
Cholesky flop count	5.4e+08
nnz(L+U), no partial pivoting, with AMD	2,244,620
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,854,625
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	3,424,313

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 725 explicit zero entries.

SVD-based statistics:
norm(A)	3.72481
min(svd(A))	0.000876027
cond(A)	4251.94
rank(A)	3,242
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.