[R] Simple question on finding duplicates

[Bert Gunter]

Sorry...
?duplicated

-- Bert

On Wed, Jul 25, 2012 at 1:28 PM, Bert Gunter <bgunter at gene.com> wrote:
> ummm...
> ?duplicates
>
> -- Bert
>
> On Wed, Jul 25, 2012 at 1:22 PM, David L Carlson <dcarlson at tamu.edu> wrote:
>> duplicate <- ifelse(c(0, a$col[-length(a$col)])==c(a$col), 1, 0)
>>
>> ----------------------------------------------
>> David L Carlson
>> Associate Professor of Anthropology
>> Texas A&M University
>> College Station, TX 77843-4352
>>
>>
>>> -----Original Message-----
>>> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
>>> project.org] On Behalf Of Jeff
>>> Sent: Wednesday, July 25, 2012 3:06 PM
>>> To: r-help at r-project.org
>>> Subject: [R] Simple question on finding duplicates
>>>
>>>
>>>    I'm  trying  to find duplicate values in a column of a data frame.
>>> For
>>>    example, dataframe (a) below has two 3's. I would like to mark each
>>> value of
>>>    each row as either not being a duplicate of the one before (0), or
>>> as a
>>>    duplicate (1) - for example, as in dataframe (b). In SPSS, I would
>>> simply
>>>    compare each value to it's "lagged" value, but I can't figure out
>>> how to do
>>>    this with R.
>>>    Can someone point me in the right direction?
>>>    Thanks
>>>    a <- data.frame( col1 = c(1,2,3,3,4))
>>>    b <- data.frame( col1 = c(1,2,3,3,4), duplicate = c(0,0,0,1,0))
>>> ______________________________________________
>>> R-help at r-project.org mailing list
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>>> 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.
>
>
>
> --
>
> Bert Gunter
> Genentech Nonclinical Biostatistics
>
> Internal Contact Info:
> Phone: 467-7374
> Website:
> http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm