Sergio Della Franca wrote:
> Dear R-Helpers,
>
> I have this dataset:
>
>   YEAR   PRODUCTS cluster
>   1       10       2
>   2       42       3
>   3       25       2
>   4       42       3
>   5       40       3
>   6       45       1
>   7       44       1
>   8       47       1
>   9       42       1
>
>
> I want to create a subset (when cluster=1),
>
>   YEAR   PRODUCTS cluster
>   6       45       1
>   7       44       1
>   8       47       1
>   9       42       1
>
>
> How can i perform this?
>
>

You've answered your own question!

?subset


e.g., subset(my.data, cluster==1)

You should also notice that many R functions support a subset=
parameter, which is very useful!

Mark

--
Dr. Mark Wardle
Specialist registrar, Neurology
Cardiff, UK

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