inefficient ifelse() ?
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 <mantino84 at 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" -- View this message in context: http://r.789695.n4.nabble.com/inefficient-ifelse-tp3330423p4512579.html Sent from the R help mailing list archive at Nabble.com.
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