Matrix properties
number of rows	2,003
number of columns	2,003
nonzeros	83,883
structural full rank?	yes
structural rank	2,003
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	J. Lewis
editor	I. Duff, R. Grimes, J. Lewis
date	1982
kind	computational fluid dynamics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	265,942
Cholesky flop count	5.5e+07
nnz(L+U), no partial pivoting, with AMD	529,881
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	479,799
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	848,644

SVD-based statistics:
norm(A)	3.11481e+12
min(svd(A))	284.333
cond(A)	1.09548e+10
rank(A)	2,003
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.