On 2011-05-27 10:18, eventual wrote:
I have an array , @datas, and each element within @datas is a string that's
made up of 6 digits with spaces in between like this “1 2 3 4 5 6”, so the
array look like this
@datas = ('1 2 3 4 5 6', '1 2 9 10 11 12', '1 2 3 4 5 8', '1 2 3 4 5 9' , '6 7
8 9 10 11');
Now I wish to compare each element of @datas with the rest of the elements in
@datas in such a way that if 5 of the digits match, to take note of the
matching indices, and so the script I wrote is appended below.
a. Do once what you can do only once. There are at least 2 points where
you didn't: 1. prepare @datas before looping; 2. don't compare the same
stuff more than once.
b. Assemble a result, and report at the end. Don't use any 'shared
resources' like incrementing global counters while going along.
#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
my @data = <DATA>;
$_ = { map { $_ => 1 } split } for @data;
$ARGV[0] and print Dumper( \@data );
my @result;
for my $i ( 0 .. $#data - 1 ) {
my @k = keys %{ $data[ $i ] };
for my $j ( $i + 1 .. $#data ) {
my $n = 0;
exists $data[ $j ]{ $_ } and ++$n for @k;
$n >= 5 and push @result, [ $i, $j ];
}
}
print Dumper( \@result );
__DATA__
1 2 3 4 5 6
1 2 9 10 11 12
1 2 3 4 5 8
1 2 3 4 5 9
6 7 8 9 10 11
--
Ruud
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