Thanks Dennis and Mike... I'm getting it!!!
Sent from my Android
Rui Barradas <ruipbarra...@sapo.pt> wrote:
>Hello,
>
>To know why, just evaluate the condition, with 't1$' before 'version_1':
>
>which(as.character(t1$version_1) %in% a) != 0
>[1] TRUE TRUE
>
>
>It allways evaluates to TRUE, therefore, subset() returns all rows.
>
>See if this isn't simpler than both of your forms.
>
>v2 <- subset(t1, version_1 %in% a)
>v2
> id version_1
>1 1 100-1
>2 2 100-2
>
>The trick is to use %in% when doing multiple comparisons. With the
>vector with length equal to the number of observations on the left hand
>side.
>
>Hope this helps,
>
>Rui Barradas
>
>Em 13-07-2012 12:12, Charles Stangor escreveu:
>> Why does the subset not work in the which() version below?
>>
>> Thank you
>>
>>
>> v1 <- subset(t1,
>> version_1==as.character("100-1")
>> | version_1==as.character("100-2"))
>>
>> a<-c("100-1", "100-2")
>> v1 <- subset(t1, which(a==as.character(version_1)) != 0)
>>
>> [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
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