Matrix properties
number of rows	23,560
number of columns	23,560
nonzeros	460,598
structural full rank?	yes
structural rank	23,560
# of blocks from dmperm	1
# strongly connected comp.	1
entries not in dmperm blocks	0
explicit zero entries	23,658
nonzero pattern symmetry	100%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Mahajan
editor	Z. Bai, D. Day, J. Demmel, J. Dongarra
date	1991
kind	computational fluid dynamics problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS
nnz(chol(P*(A+A'+s*I)*P'))	4,188,143	4,105,980
Cholesky flop count	1.3e+09	1.3e+09
nnz(L+U), no partial pivoting	8,352,726	8,188,400
nnz(V) for QR, upper bound nnz(L) for LU	5,826,584	6,898,557
nnz(R) for QR, upper bound nnz(U) for LU	10,916,614	12,976,164

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 23658 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.