Jasmine
Administrator
Jan 19, 2001, 3:10 PM
Post #1 of 1
(1037 views)
|
|
How do I compute the difference of two arrays? How
|
Can't Post
|
|
(From the Perl FAQ)
How do I compute the difference of two arrays? How do I compute the intersection of two arrays?
Use a hash. Here's code to do both and more. It assumes that each element is unique in a given array: @union = @intersection = @difference = ();
%count = ();
foreach $element (@array1, @array2) { $count{$element}++ }
foreach $element (keys %count) {
push @union, $element;
push @{ $count{$element} > 1 ? \@intersection : \@difference }, $element;
} |
MAIN
SEARCH
WHO'S 
LOG 