select same row in a data frame several times

Try

B <- c("a", "a", "a", "h", "b", "e")
subset(A, ID2 %in% B)

or
  subset(A, ID2 %in% unique(B))
will do as well
Don MacQueen

Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062

On 11/14/14, 1:45 PM, "Pedro Mardones" <mardones.p at gmail.com> wrote:

>Dear R user;
>
>Consider the following toy example
>
>A <- data.frame(ID1 = c(1,2,3,1,2,3,1,2,3), ID2 =
>c("a","b","c","d","e","f","g","h","i"), stringsAsFactors = FALSE)
>B <- sample(a$ID2, 6, replace = TRUE)
>
>Lets say B is = "a", "a", "a", "h", "b", "e"
>
>I want to extract from A the rows where ID2 == B. If I use
>AA <- A[A$ID2 %in% B == TRUE,], I get only 1 row with ID2="a" instead of
>the 3 rows I want.
>
>Is it possible to easily implement this selection? (same row several
>times)
>
>Thanks
>Pedro
>
>	[[alternative HTML version deleted]]
>
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select same row in a data frame several times

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