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Answer: How can I find the union/difference/intersection of two arrays?

by chromatic (Archbishop)
on Mar 29, 2000 at 01:07 UTC ( #6368=categorized answer: print w/replies, xml ) Need Help??

Q&A > arrays > How can I find the union/difference/intersection of two arrays? - Answer contributed by chromatic

This version works. :)
my @simpsons=("homer","bart","marge","maggie","lisa"); my @females=("lisa","marge","maggie","maude"); my %simpsons=map{$_ =>1} @simpsons; my %females=map{$_=>1} @females; # the intersection of @females and @simpsons: my @female_simpsons = grep( $simpsons{$_}, @females ); # proof it works print "Female Simpson:\t$_\n" foreach (@female_simpsons); # the difference of @females and @simpsons my @male_simpsons=grep(!defined $females{$_}, @simpsons); # proof it works print "Male Simpson:\t$_\n" foreach (@male_simpsons); my %union = (); # the union of @females and @simpsons foreach(@females,@simpsons){ $union{$_}=1; } my @union2 = keys %union; # or just do this # my @union = (@females, @simpsons);

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[marto]: good morning all, TCIF
[gnosti]: I'm reading from ffmpeg lengths of video clips in H:M:S and needing to add them and format them back to H:M:S for feeding back to ffmpeg
[marioroy]: kcott Thanks
[Corion]: gnosti: I would cheat and use my approach instead of dealing with durations as objects, or a module
[Corion]: You could even do the calculation directly - my $duration = $H * 3600+ $M*60 + $S; strftime '%H:%M:%S', timelocal($duratio n)
[Corion]: (and that strftime call is largely superfluous too, converting back to H:M:S isn't hard either)

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