I haven't tried it yet but I would usually do it like this;

foreach $i (@Array_1) {

       $n = grep {$Array_2[$_] == "$i"} 0 .. $#Array_2;
       push(@m, $n);

}

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Once I have the indexes I just delete all the elements with that index in Array 2 and 3. I haven't used perl for a while but as far as I remember I was shocked how fast R does that sort of things. But that must be my not knowing perl enough.

In reply to Re^2: Match speed of R in array procesing by Anonymous Monk
in thread Match speed of R in array procesing by Anonymous Monk

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