thank you so much.it was great.but please give me some explanation about these lines of code.thank you again.

for my $idx (0 .. $#$domain) {
        my @near = grep {$_ >= 0 && $_ <= $#$domain} $idx - 1, $idx + 
+1;
        push @{$neighbours{$domain->[$idx]}}, map {$domain->[$_]} @nea
+r;
    }
}

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In reply to Re^2: finding neighbors of an element in arrays by Anonymous Monk
in thread finding neighbors of an element in arrays by persianswallow

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