Matrix properties
number of rows	17,576
number of columns	17,576
nonzeros	379,761
structural full rank?	yes
structural rank	17,576
# of blocks from dmperm	1,807
# strongly connected comp.	31
explicit zero entries	2,214
nonzero pattern symmetry	0%
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 17576-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	33,691,522
Cholesky flop count	1.7e+11
nnz(L+U), no partial pivoting, with AMD	67,365,468
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	812,224
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,670,800

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 2214 explicit zero entries.

SVD-based statistics:
norm(A)	19.9128
min(svd(A))	4.71721e-23
cond(A)	4.2213e+23
rank(A)	17,182
sprank(A)-rank(A)	394
null space dimension	394
full numerical rank?	no
singular value gap	4.87732

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.