Matrix properties
number of rows	22,560
number of columns	22,560
nonzeros	1,014,951
structural full rank?	yes
structural rank	22,560
# of blocks from dmperm	2
# strongly connected comp.	2
explicit zero entries	0
nonzero pattern symmetry	64%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	R. Goodwin
editor	T. Davis
date	1995
kind	computational fluid dynamics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	1,927,907
Cholesky flop count	2.6e+08
nnz(L+U), no partial pivoting, with AMD	3,833,254
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	4,940,213
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	16,753,049

SVD-based statistics:
norm(A)	82346.3
min(svd(A))	9.29177e-18
cond(A)	8.86228e+21
rank(A)	22,479
sprank(A)-rank(A)	81
null space dimension	81
full numerical rank?	no
singular value gap	1.00668

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.