Matrix properties
number of rows	17,880
number of columns	17,880
nonzeros	430,740
structural full rank?	yes
structural rank	17,880
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	95%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	I. Botonakis
editor	T. Davis
date	2007
kind	thermal problem
2D/3D problem?	yes

Notes:

This is a very small test problem.

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	4,014,042
Cholesky flop count	1.7e+09
nnz(L+U), no partial pivoting, with AMD	8,010,204
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	6,317,265
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	11,890,191

SVD-based statistics:
norm(A)	5.34952
min(svd(A))	0.00699774
cond(A)	764.464
rank(A)	17,880
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.