Description Usage Arguments Value Author(s) References Examples
This function calculates the symmetry nodes index SNI(T) for a given rooted
binary tree T. SNI(T) is defined as the number of inner vertices v that are not
symmetry nodes, i.e. the two pending subtrees rooted at the children of v do not
have the same tree shape.
For n=1 the function returns SNI(T)=0 and a warning.
1 | symNodesI(tree)
|
tree |
A rooted binary tree in phylo format. |
symNodesI
returns the symmetry nodes index of the given tree.
Sophie Kersting
S. J. Kersting and M. Fischer. Measuring tree balance using symmetry nodes — A new balance index and its extremal properties. Mathematical Biosciences, page 108690, 2021. ISSN 0025-5564. doi:https://doi.org/10.1016/j.mbs.2021.108690
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