[R] FW: Renaming levels of a factor in a dataframe

[Ivan Calandra]

You might want to compare the brackets in your code and in Tyler's

Ivan


Le 8/15/2011 16:36, B Jessop a écrit :
> Tyler,
>
>
>
> Tried your solution: levels (Data1$Site<- list(Fw = c("AB"), Est = c("DE")))
>
>
>
> but still got a NULL response to str(Data1) and an alternating list of Fw, Est, Fw, Est under Site when looked at in the Data editor in R console. The use of the "levels" function would seem to be appropriate but tricky to use.  Any other ideas would be welcome.
>
>
>
> Regards,
>
> BJ
>
> ________________________________
>> From: tyler_rinker at hotmail.com
>> To: deelman at hotmail.com; r-help at r-project.org
>> Subject: RE: [R] Renaming levels of a factor in a dataframe
>> Date: Sun, 14 Aug 2011 13:18:12 -0400
>>
>> Here's an example of relevel used to relevel and combine groups....
>>
>> InsectSprays2<-InsectSprays
>> levels(InsectSprays2$spray)
>> levels(InsectSprays2$spray)<-list(new1=c("A","C"),YEPS=c("B","D","E"),LASTLY="F")
>> levels(InsectSprays2$spray)
>> InsectSprays2
>>
>> So for you try...
>> levels (Data1$Site)<- list(Fw =c( "AB"), Est = c("DE"))
>>
>>> From: deelman at hotmail.com
>>> To: r-help at r-project.org
>>> Date: Sun, 14 Aug 2011 12:56:25 -0300
>>> Subject: [R] Renaming levels of a factor in a dataframe
>>>
>>>
>>>
>>> Dear Helplist:
>>>
>>>
>>>
>>> I am trying, unsuccessfully, to rename levels of a factor in a
>> dataframe. The dataframe consists of two factor variables and one
>> numeric variable as follows:
>>> Factor Site has 2 levels AB and DE, factor Fish has 30 levels, 15
>> associated with each Site e.g. 1-1, 1-2,.....2-1, 2-2.... I am trying
>> to rename the levels of factor Site from AB to Fw and DE to Est while
>> keeping them as factors. The following 2 approaches do not work, each
>> giving a NULL response and creating a character string.
>>>
>>>
>>> levels (Data1$Site<- c("Fw", "Est")) This simply gives an
>> alternating list of Fw, Est, Fw, Est... not the desired 15 concurrent
>> rows of Fw followed by 15 of Est.
>>>
>>>
>>> #levels (Data1$Site<- list(Fw = "AB", Est = "DE")) This gives the
>> same result. I have tried other approaches to no avail. It seems a
>> simple problem but has not been so.
>>>
>>>
>>> Any suggestions for solving this problem would be much appreciated.
>>>
>>>
>>>
>>> Regards,
>>>
>>> BJ
>>> ______________________________________________
>>> 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.  		 	   		
> ______________________________________________
> 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.
>

-- 
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Museum
Dept. Mammalogy
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
ivan.calandra at uni-hamburg.de

**********
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