Calculates the most recent common ancestor for each pair of
tips. Used internally by getEventData.
getmrca(phy, t1, t2)An object of class phylo.
A vector of mode integer or character corresponding to tips in
phy.
A vector of mode integer or character corresponding to tips in
phy.
A vector of node numbers of the common ancestor for each pair of tips.
Finds the most recent common ancestor for each pair of tips where
pairs are defined as (t1[1], t2[1]), (t1[2],
t2[2]), ... , (t1[i], t2[i]), ... ,(t1[n],
t2[n]).