[R] Deleting rows based on duplicate entries in one columns in a data matrix

[Gabor Grothendieck]

See:

?duplicated

On Tue, Jan 19, 2010 at 9:47 PM, Tuatara <franziskabroell at gmail.com> wrote:
>
> Hi everybody,
>
> I would like to delete rows based on duplicate entries in column 3 in the
> data matrix X (size 60000 x 57). I have tried the unique(x) command as
>
>> data <- X[unique(X[,3]),]
>
> however, for some reason the command introduces a lot of NA's into the
> dataset.
> So, now I'm looking for a function that eliminates rows, if they have
> duplicate values in column 3.
>
> Does anyone have an idea how to do this?
>
> Cheers and thanks a lot for the help,
> Fran
> --
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