Hi Alexey,
The package phylobase allows you to do this either for all the tips, or
any/all nodes of your tree:
library(phylobase)
data(geospiza)
## for the tips
depthTips(geospiza)
## for one node
nodeDepth(geospiza, 16)
## for all internal nodes
nodeDepth(geospiza, nodeId(geospiza, "internal"))
Cheers,
-- François
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