Matrix properties
number of rows	1,280
number of columns	2,800
nonzeros	11,520
structural full rank?	yes
structural rank	1,280
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	0%
numeric value symmetry	0%
type	integer
structure	rectangular
Cholesky candidate?	no
positive definite?	no

author	M. Franz
editor	J.-G. Dumas
date	2008
kind	combinatorial problem
2D/3D problem?	no

Notes:

Cohomology of various rings, from Matthias Franz, Univ. Konstanz, Germany
From Jean-Guillaume Dumas' Sparse Integer Matrix Collection,             
http://ljk.imag.fr/membres/Jean-Guillaume.Dumas/simc.html                
                                                                         
Filename in JGD collection: Franz/1280x2800                              

Ordering statistics:	result
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	1,490,496
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	443,191

SVD-based statistics:
norm(A)	6.32456
min(svd(A))	1.34883e-17
cond(A)	4.68892e+17
rank(A)	1,025
sprank(A)-rank(A)	255
null space dimension	255
full numerical rank?	no
singular value gap	2.2175e+14

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.