[R] inefficient ifelse() ?

[Manta]

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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