[R] Summing up Non-numeric column

[Ivan Calandra]

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:
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>> Sent from the R help mailing list archive at Nabble.com.
>>
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>
> ______________________________________________
> 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.
>

-- 
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

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