[R] Summing up Non-numeric column

[Bill.Venables at csiro.au]

?unique 

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of zhiji19
Sent: Wednesday, 8 December 2010 2:57 PM
To: r-help at r-project.org
Subject: [R] Summing up Non-numeric column


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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