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Re: Difference between two arrays

by injunjoel (Priest)
on Mar 22, 2006 at 17:26 UTC ( #538552=note: print w/ replies, xml ) Need Help??


in reply to Difference between two arrays

Greetings,
I liked the hash approach holli suggested.
Here are my thoughts.

#!/usr/bin/perl -w use strict; my $before = [qw(1 2 3 4 5 6 7 8 9 10)]; my $after = [qw(2 3 4 5 1 6 7 8 9 10)]; my %start; @start{@{$before}} = @{$after}; #every little shift. my %moved = map{ ($_ != $start{$_}) ? ($_, $start{$_}) : () }keys %start; #shifts larger than one. my %huge_offset = map{ (abs($_ - $start{$_}) > 1) ? ($_, $start{$_}) : () } keys %start; #lets check what we have... print "BEFORE:\t"; print "@$before\n"; print "AFTER:\t"; print "@$after\n"; print "\nOFFSETS:\n"; print "$moved{$_}: ".($start{$_}-1)." to ".($_ - 1)."\n" for( sort {$a +<=>$b} keys %moved); print "\nHUGE OFFSETS:\n"; print "$huge_offset{$_}: ".($start{$_}-1)." to ".($_ - 1)."\n" for( so +rt {$a<=>$b} keys %huge_offset);
and the output.
BEFORE: 1 2 3 4 5 6 7 8 9 10 AFTER: 2 3 4 5 1 6 7 8 9 10 OFFSETS: 2: 1 to 0 3: 2 to 1 4: 3 to 2 5: 4 to 3 1: 0 to 4 HUGE OFFSETS: 1: 0 to 4


-InjunJoel
"I do not feel obliged to believe that the same God who endowed us with sense, reason and intellect has intended us to forego their use." -Galileo


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