[R] Use 2 "ifelse" to sort data

[David Winsemius]

On Feb 22, 2010, at 8:13 PM, Chunhao wrote:

>
> Dear R users,
> I have a question how to use 2 "ifelse" to sort my data. Such as
> from 11 to 20 assign to A; 6 to 10 assign to B, and the rest of them  
> assign
> to C
>
> a<-1:20
>
> tt<-ifelse(a>10, "A",no=ifelse( 5< a <=10, "B", "C"))

Two way comparisons are not supported in R (so use "&") and the  
negative consequent is not named:

 > tt<-ifelse(a>10, "A", ifelse(5< a & a <=10, "B", "C"))
 > tt
  [1] "C" "C" "C" "C" "C" "B" "B" "B" "B" "B" "A" "A" "A" "A" "A" "A"  
"A" "A" "A" "A"
 >
-- 
David.
>
>
> Many Thanks
> Chunhao
>
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