[R] Adding a new column to data frame (recoding)

[Aleksey Naumov]

Dear R users,

I have a very simple question. What is the easiest way to recode data in
one
of the columns of a data frame and put it into a new column?

For example, here is a simple data frame:

  var1
1    1
2    2
3    3

How do I add a new column to data - 'var2' in which I group  values in
'var1',
for example:

  var1 var2
1    1    4
2    2    4
3    3    5

It's got to be simple, but I can't find it...

Aleksey

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