[R] Where is a function for minimum spanning tree in R for win

[Hisaji ONO]

Hello the R people.

 I'd like to calculate shortest distances between cities in one area 
from cities' coordinates.

 For this purpose, Splus has a function, "mstree" for calculating 
minimum spring tree.

 But for R, I couldn't find similar function.

It seems that R has little function for OR(Operational Research).

Does anyone know about availability of this method in R?

 
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