Matrix properties
number of rows	261
number of columns	261
nonzeros	2,319
structural full rank?	yes
structural rank	261
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	50%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	B. Muite
editor	T. Davis
date	2007
kind	structural problem
2D/3D problem?	yes

Notes:

Chebyshev integration matrix from Benson Muite, Oxford.  Details of the  
matrices can be found in a preprint at http://www.maths.ox.ac.uk/~muite  
entitled "A comparison of Chebyshev methods for solving fourth-order     
semilinear initial boundary value problems," June 2007.   These matrices 
are very ill-conditioned, partly because of the dense rows which are hard
to scale when coupled with the rest of the matrix.                       

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	1,803
Cholesky flop count	1.3e+04
nnz(L+U), no partial pivoting, with AMD	3,345
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,040
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	34,191

SVD-based statistics:
norm(A)	20277.2
min(svd(A))	2.95871e-12
cond(A)	6.85338e+15
rank(A)	259
sprank(A)-rank(A)	2
null space dimension	2
full numerical rank?	no
singular value gap	4.61037e+06

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.