Matrix properties
number of rows	541
number of columns	541
nonzeros	4,282
structural full rank?	yes
structural rank	541
# of blocks from dmperm	2
# strongly connected comp.	2
explicit zero entries	3
nonzero pattern symmetry	68%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Curtis
editor	A. Curtis, I. Duff, J. Reid
date	1978
kind	2D/3D problem sequence
2D/3D problem?	yes

Notes:

next: HB/fs_541_2 first: HB/fs_541_1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	7,140
Cholesky flop count	1.1e+05
nnz(L+U), no partial pivoting, with AMD	13,739
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	8,860
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	18,338

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 3 explicit zero entries.

SVD-based statistics:
norm(A)	66.9474
min(svd(A))	0.0149843
cond(A)	4467.84
rank(A)	541
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.