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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