fastMRCA: Get the MRCA (or height above the root of the MRCA) of a pair of tip taxa
Description
This function returns the most recent common ancestor (node number) for a pair of taxa; or, in the case of fastHeight, the height above the root of the MRCA of a pair of taxa; or, in the case of fastDist, the patristic distance between a pair of taxa.
This function is mostly redundant with findMRCA (or findMRCA(...,type="height") in the case of fastHeight) but for very large trees will be considerably faster. (Also see getMRCA in the ape package.)
References
Revell, L. J. (2012) phytools: An R package for phylogenetic comparative biology (and other things). Methods Ecol. Evol., 3, 217-223.