[R] Query about using setdiff

[Don MacQueen]

names(DF1)[ !(names(DF1) %in% names(DF2)) ]

To illustrate:

>  x <- letters[1:5]
>  y <- letters[c(2,4)]
>  x[ !(x %in% y) ]
[1] "a" "c" "e"


At 11:41 AM -0800 3/7/07, lalitha viswanath wrote:
>Hi
>I have two dataframes
>names(DF1) = c("id", "val1", "val2");
>
>names(DF2) = c("id2");
>
>Ids in DF2 are a complete subset of those in DF1
>
>How can I extract entries from DF1 where id NOT IN
>DF2.
>
>I tried setdiff(DF1, DF2); setdiff(DF1$id, DF2$id),
>etc.
>Although the latter eliminates the ids as required, I
>dont know how to extract val1 and val2 for the
>resultant set.
>
>
>Thanks
>Lalitha
>
>
>
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-- 
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA