Matrix properties
number of rows	59
number of columns	59
nonzeros	271
structural full rank?	yes
structural rank	59
# of blocks from dmperm	19
# strongly connected comp.	1
explicit zero entries	41
nonzero pattern symmetry	9%
numeric value symmetry	0%
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	561
Cholesky flop count	7.2e+03
nnz(L+U), no partial pivoting, with AMD	1,063
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	235
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	468

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 41 explicit zero entries.

SVD-based statistics:
norm(A)	8.6395
min(svd(A))	5.28815e-05
cond(A)	163375
rank(A)	59
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.