[R] How to recode variables using base R
johannes rara
johannesraja at gmail.com
Tue Mar 30 17:42:51 CEST 2010
Thanks, you're a lifesaver.
-J
2010/3/30 Henrique Dallazuanna <wwwhsd at gmail.com>:
> Using lapply:
>
> as.data.frame(lapply(df, cut, breaks = c(-Inf, 3, 8, 16), labels =
> c('x', 'y', 'z')))
>
>
> On Tue, Mar 30, 2010 at 10:14 AM, johannes rara <johannesraja at gmail.com> wrote:
>> Thanks John and Henrique, my intention is to do this for A, B and C
>> (all at once), so I'll have to wrap your solution into lapply or for
>> loop?
>>
>> -J
>>
>> 2010/3/30 Henrique Dallazuanna <wwwhsd at gmail.com>:
>>> You could try this also:
>>>
>>> cut(df$A, c(-Inf, 3, 8), labels = c('x', 'y'))
>>>
>>> On Tue, Mar 30, 2010 at 8:30 AM, johannes rara <johannesraja at gmail.com> wrote:
>>>> Hi,
>>>>
>>>> Is there an efficient way recoding variables in a data.frame using
>>>> base R? My purpose is to create
>>>> new variables and attach them into old data.frame. The basic idea is
>>>> shown below, but how to create recoding for A, B and C and assing them
>>>> into new variables?
>>>>
>>>> df <- data.frame(A = c(1:5),
>>>> B = c(3,6,2,8,10),
>>>> C = c(0,15,5,9,12))
>>>>
>>>> df$A[df$A <= 3] <- "x"
>>>> df$A[df$A > 3 & df$A <= 8] <- "y"
>>>> df$A[df$A <= 16] <- "z"
>>>>
>>>> Thanks,
>>>> -J
>>>>
>>>> ______________________________________________
>>>> R-help at r-project.org mailing list
>>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>>>> and provide commented, minimal, self-contained, reproducible code.
>>>>
>>>
>>>
>>>
>>> --
>>> Henrique Dallazuanna
>>> Curitiba-Paraná-Brasil
>>> 25° 25' 40" S 49° 16' 22" O
>>>
>>
>
>
>
> --
> Henrique Dallazuanna
> Curitiba-Paraná-Brasil
> 25° 25' 40" S 49° 16' 22" O
>
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