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

[Tuatara]

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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