while (<IN>) {
    our(@F) = split(/\s+/, $_, 0);
    push @{$r{join ' ' x 8, @F[0..3]};}, [@F[4, 6]];
    sub END {
        foreach $k (keys %r) {
            my($x, $y);
            map {$x += $$_[0]; $y += $$_[1];} @{$r{$k};};
            my @g = split(/\s+/,$k);
            print OUT "$g[0]\t@g[1]\t@g[2]\t@g[3]\t", $x / scalar(@{$r
+{$k};}), "\t$y\n";
        }
    }
}

[download]

Another odd thing to note about this code is the  END block planted in the middle of it, written in a disparaged way as a sub block. Please see the "BEGIN, UNITCHECK, CHECK, INIT and END" section in perlmod. Because all  END blocks run at the end (!) of all other code, I think this chunk of code could more clearly and conventionally be written as: 

while (<IN>) {
    our(@F) = split(/\s+/, $_, 0);
    push @{$r{join ' ' x 8, @F[0..3]};}, [@F[4, 6]];
}

... all other code ...

END {
    foreach $k (keys %r) {
        my($x, $y);
        map {$x += $$_[0]; $y += $$_[1];} @{$r{$k};};
        my @g = split(/\s+/,$k);
        print OUT "$g[0]\t@g[1]\t@g[2]\t@g[3]\t", $x / scalar(@{$r{$k}
+;}), "\t$y\n";
    }
}

[download]
Good luck.

Give a man a fish:  <%-{-{-{-<

In reply to Re: Code clarification - use of map and $$_ by AnomalousMonk
in thread Code clarification - use of map and $$_ by Anonymous Monk

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