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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