N1Spr() calculates the number of trees one subtree prune-and-regraft
operation away from a binary input tree using the formula given by
Allen2001;textualTreeTools;
IC1Spr() calculates the information content of trees at this
distance: i.e. the entropy corresponding to the proportion of all possible
n-tip trees whose SPR distance is at most one from a specified tree.
Arguments
- n
Integer vector specifying the number of tips in a tree.
Value
N1Spr() returns an integer vector denoting the number of trees one
SPR rearrangement away from the input tree..
IC1Spr() returns an numeric vector giving the phylogenetic
information content of trees 0 or 1 SPR rearrangement from an n-leaf tree,
in bits.
Examples
N1Spr(4:6)
#> [1] 2 12 30
IC1Spr(5)
#> [1] 0.2064509