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# Copyright (c) 1997-2018
# Ewgenij Gawrilow, Michael Joswig (Technische Universitaet Berlin, Germany)
# http://www.polymake.org
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any
# later version: http://www.gnu.org/licenses/gpl.txt.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#-------------------------------------------------------------------------------
object PolyhedralFan {
# A Polytope defined by a non-empty set of [[VERTICES]] or [[POINTS]] is always [[FEASIBLE]].
rule initial : {
if (defined (my $ic=$this->INPUT_CONES)) {
if($ic->rows == 0){
my $emptySet = new Array<Set<Int>>();
my $empty = new Matrix<Scalar>();
my $ambient_dim= $this->lookup("FAN_AMBIENT_DIM")//0 ;
my $M;
if ((defined ($M=$this->lookup("INPUT_RAYS")) && $M->cols()>0)
|| (defined ($M=$this->lookup("INPUT_LINEALITY")) && $M->cols()>0))
{
$ambient_dim = $M->cols();
}
my $repl=new Core::Object::Replacement(RAYS => $empty, LINEALITY_SPACE => $empty, MAXIMAL_CONES => $emptySet, FAN_DIM=>-1, FAN_AMBIENT_DIM=>$ambient_dim);
foreach my $prop (qw(INPUT_LINEALITY)) {
if (defined (my $val=$this->lookup($prop))) {
$repl->attach($prop, $val);
}
}
die $repl;
}
}
}
precondition : exists(INPUT_CONES);
rule initial : {
if($this->INPUT_CONES->cols() > $this->INPUT_RAYS->rows()){
croak("\ninvalid input: number of rays used in INPUT_CONES exceeds number of INPUT_RAYS");
}
}
precondition : exists(INPUT_CONES);
precondition : exists(INPUT_RAYS);
}
# Local Variables:
# mode: perl
# perl-indent-level: 3
# indent-tabs-mode:nil
# End:
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