Matrix properties
number of rows	18,000
number of columns	18,000
nonzeros	6,897,316
structural full rank?	yes
structural rank	18,000
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	author unknown
editor	T. Davis
date	2003
kind	2D/3D problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	51,202,639
Cholesky flop count	2.0e+11
nnz(L+U), no partial pivoting, with AMD	102,387,278
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	48,412,972
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	94,422,866

SVD-based statistics:
norm(A)	132.841
min(svd(A))	8.44394e-06
cond(A)	1.57321e+07
rank(A)	18,000
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.