PLoS supp. material by Hermann Cuntz
this is a meta-function
Returns for tree intree an Nx1 vector ratio
which takes the ratios of values of Nx1 vector v at
the node itself and its direct parent idpar.
By default, „ratio_tree“ compares diameter values: v is then just D. However, any other values can be chosen here. ratio is just v/v(idpar).
>> ratio_tree (sample2_tree)'
[1 0.82 0.82 0.87 0.82 0.83 0.95 0.86 0.75 0.78 0.87 0.85 0.81 0.9 0.58]
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