repeating categorical variable codes

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Hi
I would appreciate help in knowing how to repeat categorical variable 
code
given in column=A, by the number in a matching column=B.
For example, I have a categorical variable code attributed to a 
household=A
and want to replicate the code for all member of the household, as given 
in
column=B. I would like to have one sequence of categorical variable 
codes
for individuals in column C. I have ~9000 values in A and my C will be
~52000.

E.g
(A)    (B)      (C)
1       1         1
2       2         2
1       1         2
2       3         1
                    2
                    2
                    2

Any ideas would be gratefully accepted by a novice R user.
I am not sure if I understand your problem but does rep(A, B)

give you what you want?

rep(letters[1:3], 1:3)
[1] "a" "b" "b" "c" "c" "c"

Regards
Petr
Ric

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