Just use a regular if statement:
X <- if(b == "YY") a else substr(a, 1,3)
Michael
On Wed, Mar 28, 2012 at 11:19 AM, Manta <mantin...@libero.it> wrote:
> I have a similar problem. I have a dataset and an element. If the element is
> equal to "YY", I want to take the first column of the dataset, otherwise I
> want to take the second column. The following does not work, as it only
> evaluates the first element. Any idea?
>
> a=c("AAAXXX","BBBXXX")
> a=merge(a,c("AAA","BBB"))
> b="YY"
>> ifelse(b=="YY",a,substr(a,1,3))
> [1] "AAAXXX"
>
>
>
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>
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