PLoS supp. material by Hermann Cuntz
intree must be BCT!!
At each branch point of tree intree, node values of
Nx1 vector v get summed up in each sub-tree to Σ1 and Σ2.
asym, an Nx1 vector, contains the ratio of Σ1 / (Σ1 + Σ2)
for Σ1 < Σ2 at branch points (but NaN otherwise).
By default, number of terminal child nodes are compared in both sub-trees
at a branch point: v is a vector of 1 when termination point and 0 else
For the example branch point on the right (at node 3),
Σ1=2 terminals are divided by Σ1 + Σ2 = 2+3 terminals (= 0.4).
>> asym_tree (sample2_tree, T_tree (sample2_tree))'
[NaN, NaN, 0.4, NaN, NaN, 0.5, NaN, NaN, NaN, 0.3333, NaN, 0.5, NaN, NaN, NaN]
see demo movie with option '-m'
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