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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.
#-------------------------------------------------------------------------------
REQUIRE polytope::_4ti2.rules
CREDIT 4ti2
# path to circuits
custom $circuits;
CONFIGURE {
$circuits = $polytope::groebner =~ s/groebner$/circuits/r;
}
label _4ti2
object Matroid {
rule _4ti2.circuits : CIRCUITS : VECTORS {
my $A = $this->VECTORS;
$this->CIRCUITS = [@{index_matrix(_4ti2Circuits($A))}];
}
weight 3.01;
}
# @category Combinatorics
# Calculate the circuits of a set of points given as the rows of a Matrix A.
# The circuits are given as a matrix such that vA=0 for all rows v.
# @param Matrix A Matrix containing the points as rows.
# @return Matrix
user_function _4ti2Circuits(Matrix) {
my ($A) = @_;
my $tempname = new Tempfile;
open my $filePipe, ">", "$tempname.mat";
print $filePipe $A->cols." ".$A->rows."\n";
print $filePipe dense(transpose(primitive($A)));
close($filePipe);
if ($Verbose::external) {
dbg_print( "running 4ti2: $circuits -q $tempname" );
}
system("$circuits -q $tempname".(!$DebugLevel && " >/dev/null 2>&1"))
and die "couldn't run 4ti2: $circuits -q $tempname.mat\n";
open(my $outfile, "<", "$tempname.cir")
or die "can't open output file $tempname.cir: $!";
my $dimline = <$outfile>;
my @circuits;
local $_;
while (<$outfile>) {
my @vec = split;
push @circuits, \@vec;
}
close $outfile;
return new SparseMatrix(\@circuits);
}
# Local Variables:
# mode: perl
# cperl-indent-level:3
# indent-tabs-mode:nil
# End:
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