Matrix properties
number of rows	54
number of columns	54
nonzeros	291
structural full rank?	yes
structural rank	54
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	95%
numeric value symmetry	95%
type	binary
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Curtis
editor	A. Curtis, I. Duff, J. Reid
date	1971
kind	2D/3D problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	224
Cholesky flop count	9.8e+02
nnz(L+U), no partial pivoting, with AMD	394
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	266
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	556

SVD-based statistics:
norm(A)	6.72424
min(svd(A))	1.63996e-17
cond(A)	4.10025e+17
rank(A)	50
sprank(A)-rank(A)	4
null space dimension	4
full numerical rank?	no
singular value gap	3.70506e+13

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.