[R] Use 2 "ifelse" to sort data

Bill.Venables at csiro.au Bill.Venables at csiro.au
Tue Feb 23 04:55:11 CET 2010

a <- 1:20
tt <- ifelse(a > 10, "A", ifelse(a > 5, "B", "C"))

The problem you have is with '5 < a <= 10'.  Such double sided inequalities are used in mathematics but not in R.  Here you only need the first part, but if you did need both you would need to write

5 < a & a <= 10

Look carefully and spot the difference.

Bill Venables
CSIRO/CMIS Cleveland Laboratories

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Chunhao
Sent: Tuesday, 23 February 2010 12:13 PM
To: r-help at r-project.org
Subject: [R] Use 2 "ifelse" to sort data

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


tt<-ifelse(a>10, "A",no=ifelse( 5< a <=10, "B", "C")) 

Many Thanks

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