[R] distance between phylogenetic trees (quartet, NNI)

[Kaustubh Raosaheb Patil]

Hi all,

I want to calculate distances between phylogenetic trees. I found 
functions for symmetric difference (e.g. in ape and in some other 
packages).

In addition to this I also want to calculate quartets and nearest 
neighbor interchange distances; are there any functions for this?

My apologies if they exist and I overlooked.

best regards