Matrix properties
number of rows	4,101
number of columns	4,101
nonzeros	81,057
structural full rank?	yes
structural rank	4,101
# of blocks from dmperm	443
# strongly connected comp.	31
explicit zero entries	1,625
nonzero pattern symmetry	2%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	J. Mallya
editor	T. Davis
date	1994
kind	chemical process simulation problem
2D/3D problem?	no

Additional fields	size and type
b	full 4101-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	1,867,599
Cholesky flop count	2.0e+09
nnz(L+U), no partial pivoting, with AMD	3,731,097
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	135,543
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	333,874

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1625 explicit zero entries.

SVD-based statistics:
norm(A)	13.4141
min(svd(A))	3.25413e-18
cond(A)	4.12219e+18
rank(A)	4,096
sprank(A)-rank(A)	5
null space dimension	5
full numerical rank?	no
singular value gap	41914.2

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.