[R] Summing up Non-numeric column

[Bert Gunter]

I think

?table

is what you want.

-- Bert

On Wed, Dec 8, 2010 at 1:19 AM, Ivan Calandra
<ivan.calandra at uni-hamburg.de> wrote:
> Hi,
>
> Still another way would be to count the levels of the factors (if it is
> indeed a factor):
> length(levels(example$V1))
>
> Ivan
>
> Le 12/8/2010 06:08, Jorge Ivan Velez a écrit :
>>
>> Hi,
>>
>> One way would be
>>
>>> example<- read.table(textConnection("V1 V2
>>
>> + x   y
>> + y   x
>> + z   b
>> + a   c
>> + b   j
>> + d   l
>> + c   o"), header = TRUE)
>>>
>>> closeAllConnections()
>>> example
>>
>>   V1 V2
>> 1  x  y
>> 2  y  x
>> 3  z  b
>> 4  a  c
>> 5  b  j
>> 6  d  l
>> 7  c  o
>>>
>>> with(example, length(unique(V1)))
>>
>> [1] 7
>>>
>>> with(example, length(unique(V2)))
>>
>> [1] 7
>>
>> HTH,
>> Jorge
>>
>>
>> On Tue, Dec 7, 2010 at 11:56 PM, zhiji19<>  wrote:
>>
>>> Dear All
>>>
>>> If I have the following dataset
>>>
>>> V1 V2
>>> x   y
>>> y   x
>>> z   b
>>> a   c
>>> b   j
>>> d   l
>>> c   o
>>>
>>> How do I use R command to get the total number of different letter in
>>> column
>>> "V1"
>>> column "V1" has 7 different letters.
>>>
>>> Thank you
>>> --
>>> View this message in context:
>>>
>>> http://r.789695.n4.nabble.com/Summing-up-Non-numeric-column-tp3077710p3077710.html
>>> Sent from the R help mailing list archive at Nabble.com.
>>>
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>>        [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> 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
> Abt. Säugetiere
> Martin-Luther-King-Platz 3
> D-20146 Hamburg, GERMANY
> +49(0)40 42838 6231
> ivan.calandra at uni-hamburg.de
>
> **********
> http://www.for771.uni-bonn.de
> http://webapp5.rrz.uni-hamburg.de/mammals/eng/1525_8_1.php
>
> ______________________________________________
> 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