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
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Ivan CALANDRA
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