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
entries not in dmperm blocks	336
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:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	556,236	603,695	555,600
Cholesky flop count	2.5e+07	3.0e+07	2.5e+07
nnz(L+U), no partial pivoting	1,092,756	1,187,674	1,091,820
nnz(V) for QR, upper bound nnz(L) for LU	698,951	853,056	786,662
nnz(R) for QR, upper bound nnz(U) for LU	1,353,299	1,607,781	1,465,560

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

Maintained by Tim Davis, last updated 04-May-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.