Shame I'm only getting around to updating this little gem now, but funny how $work has a way of leading you astray just to bring you back to the same thing years later.
Indeed you are *CORRECT* - "transitive closure", and the module Graph has a submodule Graph::TransitiveClosure::Matrix that handles this. Following is code that simply replaces the "print_union" sub from my original post.
use Graph;
use Graph::TransitiveClosure::Matrix;
...
sub print_union {
my ( $node, $signal ) = @_;
my $g = Graph->new();
for my $i ( 1 .. $#{$node} - 1 ) {
for my $j ( 2 .. $#{$node} ) {
if ( defined( $signal->[$i][$j] ) and ( $signal->[$i][$j]
+> 0 ) ) {
$g->add_edge( $i, $j );
}
}
}
my $tcm = Graph::TransitiveClosure::Matrix->new( $g, reflexive =>
+0 );
print " ";
for my $i ( 2 .. $#{$node} ) {
printf "%2i ", $i;
}
print "\n ";
for my $i ( 2 .. $#{$node} ) {
printf "-- ",;
}
print "\n";
for my $i ( 1 .. $#{$node} - 1 ) {
printf "%2i] ", $i;
for my $j ( 2 .. $#{$node} ) {
printf "%2s ", ( $tcm->is_transitive( $i, $j ) ) ? "X" : "
+ ";
}
print "\n";
}
}
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