#  Copyright (c) 1997-2021
#  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.
#-------------------------------------------------------------------------------

# transform EHRHART_POLYNOMIAL_COEFF into EHRHART_POLYNOMIAL in Polytope

upgrade 3.2.1 polytope::Polytope.EHRHART_POLYNOMIAL_COEFF {
   my ($obj, $prop) = @_;
   $obj->{EHRHART_POLYNOMIAL} = vector2UniPolynomial(delete $obj->{$prop});
   true
}

sub vector2UniPolynomial {
   my ($vector) = @_;
   my $index = 0;
   my %polynomial;
   foreach (@$vector) {
      # add terms for non-zero coefficients
      if ($_ ne "0") {
         $polynomial{$index} = $_;
      }
      ++$index;
   }
   [ \%polynomial ]
}

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