RE: Find duplicates in an array

[Taylor, Andrew (ASPIRE)]

I needed to find all the duplicate values in an array and their count
of
occurences. Any help would be appreciated .

You could use a hash:

use strict;
use warnings;

my @animals = (cat,dog,wombat,cat,monkey,cat,monkey);
my %howmany;

foreach my $critter (@animals)
{
  $howmany{$critter}++;
}

foreach my $key (keys %howmany)
{
  print $key $howmany{$key}\n;
}



If you only want cases with count  1 then put an if around the print.




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Re: Find duplicates in an array

[C.DeRykus]

On Jun 2, 12:37 am, gk.kalipuray...@gmail.com (Gopal Karunakar) wrote:
 Hi All,

 I needed to find all the duplicate values in an array and their count of
 occurences. Any help would be appreciated .


See: perldoc -q dup
perldoc perlvar

Although even non-dup array members get printed,
Data::Dumper and perl's pre-defined @ARGV can
be handy. Just pass  the actual array members to
perl as command line arguments:


perl -MData::Dumper  -e '$seen{$_}++ for @ARGV;
   print Dumper \%seen'
  foo bar bat foo

--
Charles DeRykus


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