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
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:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	4,188,143
Cholesky flop count	1.3e+09
nnz(L+U), no partial pivoting, with AMD	8,352,726
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	5,826,584
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	10,916,614

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

SVD-based statistics:
norm(A)	645.74
min(svd(A))	0.0324654
cond(A)	19890.1
rank(A)	23,560
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 (A))
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.