The Strahler order will be 1 for each tip segment and then 1 + the maximum of the Strahler order of each parent segment for internal segments. Branch points will have the Strahler order of the closest segment to the root of which they are part.

`strahler_order(x)`

- x
A neuron

A list containing

points Vector of integer Strahler orders for each point in the neuron

segments Vector of integer Strahler orders for each segment in the neuron

It is vital that the root of the neuron is valid since this determines the flow direction for calculation of the Strahler order. At present the function is not defined for neurons with multiple subtrees.

Internally, this function uses `segmentgraph`

to find a reduced
segmentgraph for the neuron.

`prune_strahler`

, a `segmentgraph`

(a form
of `ngraph`

) representation is used to calculate the Strahler
order.