[R] lapply() not converting columns to factors (no error message)

[David Winsemius]

Didn't you notice the difference between Sundar's code and yours?  
Sundar put the data.frame name before the column name while you did  
not do so in your check step.

-- 
DW


On Nov 16, 2009, at 8:07 AM, A Singh wrote:

> Oh, strange!
>
> I thought it might be a problem with the 'base' package  
> installation, because the same thing's worked for me too before but  
> won't do now.
>
> I tried to reinstall it (base), but R says its there already which I  
> expected it to be anyway.
>
> I don't quite know where the issue is. Very odd.
>
>
> --On 16 November 2009 04:59 -0800 Sundar Dorai-Raj <sdorairaj at gmail.com 
> > wrote:
>
>> Works for me:
>>
>> x <-
>> read.csv(url("http://dc170.4shared.com/download/153147281/a5c78386/Testvc
>> omp10.csv?tsid=20091116-075223-c3093ab0")) names(x)
>> x[2:13] <- lapply(x[2:13], factor)
>>
>>> levels(x$P1L55)
>> [1] "0" "1"
>>> is.factor(x$P1L96)
>> [1] TRUE
>>
>>> sessionInfo()
>> R version 2.10.0 (2009-10-26)
>> i386-apple-darwin9.8.0
>>
>> locale:
>> [1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8
>>
>> attached base packages:
>> [1] stats     graphics  grDevices utils     datasets  methods   base
>>
>> other attached packages:
>> [1] lattice_0.17-26
>>
>> loaded via a namespace (and not attached):
>> [1] grid_2.10.0  tools_2.10.0
>>
>> On Mon, Nov 16, 2009 at 4:50 AM, A Singh <Aditi.Singh at bristol.ac.uk>
>> wrote:
>>> Sorry, my file is at:
>>>
>>>
>>> http://www.4shared.com/file/153147281/a5c78386/Testvcomp10.html
>>>
>>>
>>> ----------------------
>>> A Singh
>>> Aditi.Singh at bristol.ac.uk
>>> School of Biological Sciences
>>> University of Bristol
>>>
>>> ______________________________________________
>>> 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.
>>>
>
>
>
> ----------------------
> A Singh
> Aditi.Singh at bristol.ac.uk
> School of Biological Sciences
> University of Bristol
>
> ______________________________________________
> 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.

David Winsemius, MD
Heritage Laboratories
West Hartford, CT