Try this:

x1 <- transform(iris, g = iris[-ncol(iris)] * (as.numeric(iris$Species) + 1
))


On Wed, Feb 23, 2011 at 6:11 AM, Patrick Hausmann <
patrick.hausmann@uni-bremen.de> wrote:

> Dear list,
>
> this works fine:
>
> x <- split(iris, iris$Species)
> x1 <- lapply(x, function(L) transform(L, g = L[,1:4] * 3))
>
> but I would like to multiply each Species with another factor:
> setosa by 2, versicolor by 3 and virginica by 4. I've tried mapply but
> without success.
>
> Any thoughts? Thanks for any idea!
> Patrick
>
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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