Singular

LIB "polymake.lib";
==> Welcome to polymake version
==> Copyright (c) 1997-2015
==> Ewgenij Gawrilow, Michael Joswig (TU Darmstadt)
==> http://www.polymake.org
intmat M[4][4]=
1,1,0,0,
1,0,1,0,
1,0,0,1,
1,-1,-1,-1;
polytope p = polytopeViaPoints(M);
isBounded(p);
==> polymake: used package cdd
==>   cddlib
==>   Implementation of the double description method of Motzkin et al.
==>   Copyright by Komei Fukuda.
==>   http://www.ifor.math.ethz.ch/~fukuda/cdd_home/cdd.html
==> 
==> 1
M=
1,1,0,0,
1,0,1,0,
0,0,0,1,
1,-1,-1,-1;
p = polytopeViaPoints(M);
isBounded(p);
==> 0