Message-ID: <494D890B.4000500@biostat.ku.dk>
Date: 2008-12-21T00:08:43Z
From: Peter Dalgaard
Subject: NA, where no NA should (could!) be!
In-Reply-To: <loom.20081220T232310-637@post.gmane.org>
Oliver Bandel wrote:
> Hello,
>
>
> ok, I found the problem!
>
>
>
> I now have:
>
> res_size_by_host <- tapply( selected$size, factor(selected$host), sum)
>
>
> instead of
>
>
> res_size_by_host <- tapply( selected$size, selected$host, sum)
>
>
> and now it works.
>
> IMHO this is strange, because selected$host is already a factor!
>
>
> I don't know, why this must be done...
> ...someone of the R-experts might know it...
> ...and may explain it...?!
I already told you: You have empty levels in selected$host. Look at the
example I showed you.
--
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