Matrix properties
number of rows	183
number of columns	183
nonzeros	998
structural full rank?	yes
structural rank	183
# of blocks from dmperm	37
# strongly connected comp.	37
explicit zero entries	71
nonzero pattern symmetry	42%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Curtis
editor	I. Duff, R. Grimes, J. Lewis
date	1983
kind	2D/3D problem sequence
2D/3D problem?	yes

Notes:

next: HB/fs_183_3 first: HB/fs_183_1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	1,064
Cholesky flop count	7.8e+03
nnz(L+U), no partial pivoting, with AMD	1,945
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	3,749
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	7,285

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 71 explicit zero entries.

SVD-based statistics:
norm(A)	1.12935e+09
min(svd(A))	5.14889e-05
cond(A)	2.19339e+13
rank(A)	183
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.