Matrix properties
number of rows	21,200
number of columns	21,200
nonzeros	1,488,768
structural full rank?	yes
structural rank	21,200
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	48%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

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

Additional fields	size and type
b	full 21200-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	4,177,384
Cholesky flop count	1.4e+09
nnz(L+U), no partial pivoting, with AMD	8,333,568
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	8,621,160
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	17,243,112

SVD-based statistics:
norm(A)	7.98806
min(svd(A))	4.03303e-11
cond(A)	1.98066e+11
rank(A)	21,200
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 (R)) ; where [~,R,E] = spqr (A) with droptol of zero
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.