Off topic:Remove the same rows in R

Question

[pablo]

Hello guys,

I have an output like this :

 var1    var2     value
1 OTU0001 OTU0001 1.0000000
2 OTU0004 OTU0001 0.7349885
3 OTU0014 OTU0001 0.5338774
4 OTU0016 OTU0001 0.6671633
5 OTU0017 OTU0001 0.6087571
6 OTU0027 OTU0001 0.5649240
...

I would like to remove the identical rows (which are the correlations between OTUs). For example, I have the row "OTU0004 OTU0001 0.7349885" what I'll find few rows further in the form of "OTU0001 OTU0001 0.7349885" . If I can remove the same rows, I could divide my number of rows by two.

Thanks