Matrix properties
number of rows	130
number of columns	130
nonzeros	1,037
structural full rank?	yes
structural rank	130
# of blocks from dmperm	55
# strongly connected comp.	55
explicit zero entries	245
nonzero pattern symmetry	76%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Curtis
editor	A. Curtis, I. Duff, J. Reid
date	1974
kind	materials problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	841
Cholesky flop count	6.1e+03
nnz(L+U), no partial pivoting, with AMD	1,552
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	982
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	2,935

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 245 explicit zero entries.

SVD-based statistics:
norm(A)	239735
min(svd(A))	3.9598e-06
cond(A)	6.05421e+10
rank(A)	130
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.