Matrix properties
number of rows	68,600
number of columns	21,961
nonzeros	247,424
structural full rank?	yes
structural rank	21,961
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	0%
numeric value symmetry	0%
type	real
structure	rectangular
Cholesky candidate?	no
positive definite?	no

author	S. Toledo
editor	T. Davis
date	2006
kind	counter-example problem
2D/3D problem?	no

Ordering statistics:	result
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	380,896,362
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	59,379,072

SVD-based statistics:
norm(A)	51.5258
min(svd(A))	4.43415e-15
cond(A)	1.16202e+16
rank(A)	21,957
sprank(A)-rank(A)	4
null space dimension	4
full numerical rank?	no
singular value gap	1.56027e+13

singular values (MAT file):	click here
SVD method used:	s = svd (full (R)) ; where [~,R,E] = spqr (A) with droptol of zero
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.