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# Copyright (c) 1997-2024
# Ewgenij Gawrilow, Michael Joswig, and the polymake team
# Technische Universität Berlin, Germany
# https://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 {
rule initial : {
if (defined (my $ic=$this->INPUT_CONES)) {
if ($ic->rows == 0) {
my $emptySet = new Array<Set<Int>>();
my $in_rays = $this->lookup("INPUT_RAYS");
my $in_lin = $this->lookup("INPUT_LINEALITY");
my $ambient_dim = (defined($in_rays) && $in_rays->cols) ||
(defined($in_lin) && $in_lin->cols) ||
$this->lookup("FAN_AMBIENT_DIM") // 0;
my $empty = new Matrix<Scalar>(0, $ambient_dim);
my $repl = new Core::BigObject::Replacement(RAYS => $empty, LINEALITY_SPACE => $empty, MAXIMAL_CONES => $emptySet, FAN_DIM => -1, FAN_AMBIENT_DIM => $ambient_dim,
defined($in_rays) ? (INPUT_RAYS => $in_rays) : (),
defined($in_lin) ? (INPUT_LINEALITY => $in_lin) : ());
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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