Matrix properties
number of rows	1,080
number of columns	1,080
nonzeros	23,094
structural full rank?	yes
structural rank	1,080
# of blocks from dmperm	211
# strongly connected comp.	211
explicit zero entries	0
nonzero pattern symmetry	67%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Sherman
editor	I. Duff, R. Grimes, J. Lewis
date	1984
kind	computational fluid dynamics problem
2D/3D problem?	yes

Additional fields	size and type
b	full 1080-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	95,476
Cholesky flop count	1.4e+07
nnz(L+U), no partial pivoting, with AMD	189,872
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	108,809
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	211,719

SVD-based statistics:
norm(A)	2.43842e+09
min(svd(A))	0.00252861
cond(A)	9.64333e+11
rank(A)	1,080
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.