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I am using the ape package in R to make a phylogeny. 

tree1 <-read.nexus("my_unrooted_tree.nex", tree.names = NULL)

I want to find the minimum number of internal nodes of my unrooted tree.

Using tree1$edge I can could the number of ancestoral branches, but is there a way to do this automatically?

user2861089
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  • Why not include a [reproducible example](http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example) with sample input and desired output. – MrFlick Aug 06 '15 at 04:03
  • What do you mean by "minimum number of internal nodes"? The number of internal nodes is basic information included with the tree object (just type `tree$Nnode` to see the number of nodes). – SlowLoris May 22 '16 at 00:02

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