Matrix properties
number of rows	137
number of columns	137
nonzeros	400
structural full rank?	yes
structural rank	137
# of blocks from dmperm	115
# strongly connected comp.	18
explicit zero entries	11
nonzero pattern symmetry	4%
numeric value symmetry	1%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	D. Bogle
editor	I. Duff, R. Grimes, J. Lewis
date	1982
kind	chemical process simulation problem
2D/3D problem?	no

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	1,151
Cholesky flop count	1.5e+04
nnz(L+U), no partial pivoting, with AMD	2,165
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	463
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,065

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 11 explicit zero entries.

SVD-based statistics:
norm(A)	120
min(svd(A))	0.00678679
cond(A)	17681.4
rank(A)	137
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.