[R] apply question

[Bert Gunter]

... or using the handy with()

with(x,paste(n,l,sep="_"))

Slightly greater clarity and robustness, perhaps...

-- Bert

On Tue, Aug 21, 2012 at 9:24 AM, R. Michael Weylandt
<michael.weylandt at gmail.com> wrote:
> You don't need loops or apply with paste since it's vectorized:
>
> x <- data.frame(n = 1:5, l = letters[1:5], stringsAsFactors = FALSE)
>
> paste(x[,1], x[,2], sep = "_")
>
> Cheers,
> Michael
>
> On Tue, Aug 21, 2012 at 10:57 AM, Chet Seligman <chet.seligman at gmail.com> wrote:
>> This works, where zz is a dataframe:
>>
>> for(i in 1:nrow(zz)) {
>>      zzz[i,1]<-paste(zz[i,1],zz[i,2],sep="_")
>>      }
>>
>> I would like to use "apply" to concatentate two columns of text along with
>> a separator.
>> How?
>>
>> Chet
>>
>>         [[alternative HTML version deleted]]
>>
>> ______________________________________________
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>> and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-help at 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.



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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