Matrix properties
number of rows	20,545
number of columns	20,545
nonzeros	85,537
structural full rank?	yes
structural rank	20,545
# of blocks from dmperm	8,168
# strongly connected comp.	6
entries not in dmperm blocks	14,470
explicit zero entries	73,545
nonzero pattern symmetry	0%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	Bayer
editor	F. Grund
date	1997
kind	chemical process simulation problem
2D/3D problem?	no

Additional fields	size and type
b	full 20545-by-1

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	26,089,441	15,667,080	304,623
Cholesky flop count	1.2e+11	3.4e+10	1.8e+07
nnz(L+U), no partial pivoting	52,158,337	31,313,615	603,171
nnz(V) for QR, upper bound nnz(L) for LU	266,355	270,308	204,829
nnz(R) for QR, upper bound nnz(U) for LU	553,570	584,776	435,471

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 73545 explicit zero entries.

Maintained by Tim Davis, last updated 04-May-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.