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Re^2: Union/Intersection of Multiple Arrays

by VinsWorldcom (Prior)
on Mar 07, 2018 at 20:18 UTC ( #1210474=note: print w/replies, xml ) Need Help??


in reply to Re: Union/Intersection of Multiple Arrays
in thread Union/Intersection of Multiple Arrays

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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