Another option could be:
data$z <- as.numeric(gsub("(^\\d{4}).*", "\\1", gsub("^$", "2009",
data$ukrok))) - data$rocnik
On Sun, May 2, 2010 at 8:25 AM, peterko <lanikpe...@gmail.com> wrote:
>
> Thank you Jim, it works very well. I do not need do it using tapply, but i
> think that it is the way.
>
> And Patrick thank you too
> --
> View this message in context:
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>
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--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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