[R] NA, where no NA should (could!) be!

Oliver Bandel oliver at first.in-berlin.de
Sun Dec 21 00:26:25 CET 2008


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...?!


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