[R] Union of two data frames

[Gabor Grothendieck]

Try either of these:

rbind(DF1, DF2[setdiff(rownames(DF2), rownames(DF1)),])

rbind(DF1, DF2[!(rownames(DF2) %in% rownames(DF1)),])

On 9/19/06, Kartik Pappu <kartik.pappu at gmail.com> wrote:
> Hi all,
>
> I have two data frames each with 5 columns and different number of
> rows.  some of the row names in one data frame are the same as the row
> names in the other.  I want to be able to merge the two data frames to
> get a new data frame in which the duplicated row names are only shown
> once with the data for the rest of the columns used from the first
> data frame.
>
> for example:
>
>        Pvals   PD
> A       0.001   0.99
> B       0.02           0.98
> C       0.05           0.97
> D       0.005   0.99
>
>        Pvals   PD
> C       0.01           0.99
> D       0.0002  0.98
> E       0.05           0.97
> F       0.02           0.99
>
> Union
>        Pvals   PD
> A       0.001   0.99
> B       0.02           0.98
> C       0.05           0.97
> D       0.005   0.99
> E       0.05           0.97
> F       0.02    0.99
>
> Essentially, I want to make a union of the two data frames. I hope
> this question makes sense.
>
> Thanks
>
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