Matrix properties
number of rows	3,242
number of columns	3,242
nonzeros	293,409
structural full rank?	yes
structural rank	3,242
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	867
nonzero pattern symmetry	symmetric
numeric value symmetry	9%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

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

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

Notes:

next: Simon/raefsky2 first: Simon/raefsky1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	1,135,437
Cholesky flop count	5.6e+08
nnz(L+U), no partial pivoting, with AMD	2,267,632
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,847,445
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	3,422,969

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 867 explicit zero entries.

SVD-based statistics:
norm(A)	3.70951
min(svd(A))	0.000287892
cond(A)	12885.1
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.