> Da: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
> Per conto di Luca Braglia
> Inviato: venerdì 11 settembre 2009 10.17
> A: r-help@r-project.org
> Oggetto: [R] how to do this?
> in this case the ouput should be
>
> 2
> 16
> 12
>
Obviously this ....
id.match = rep(0, nrow(y))
for (indice in 1:nrow(y)) {
id.match[indice] <- y[indice, x[indice]] } id.match
... works, but it's not that good solution (especially for big data.frame)
Thank you
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