Matrix properties
number of rows	19,716
number of columns	19,716
nonzeros	227,872
structural full rank?	yes
structural rank	19,716
# of blocks from dmperm	342
# strongly connected comp.	342
explicit zero entries	336
nonzero pattern symmetry	symmetric
numeric value symmetry	46%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Baggag, Y. Saad
editor	A. Baggag, Y. Saad
date	1994
kind	computational fluid dynamics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	556,236
Cholesky flop count	2.5e+07
nnz(L+U), no partial pivoting, with AMD	1,092,756
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	698,951
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,353,299

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 336 explicit zero entries.

SVD-based statistics:
norm(A)	3.50792e+07
min(svd(A))	1.59261e-05
cond(A)	2.20263e+12
rank(A)	19,673
sprank(A)-rank(A)	43
null space dimension	43
full numerical rank?	no
singular value gap	1.02837

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.