PLoS supp. material by Hermann Cuntz
Calculates the steady state electrotonic (sse)
matrix describing the electrotonic properties
of the neuron in the tree structure intree.
Each column j is the potential distribution
in all nodes during injection of current into node j.
The diagonal contains therefore
the local input resistances of each node.
sse, NxN matrix, is therefore symmetric.
If input current I is
not identity matrix then columns
in sse correspond to potential distributions
in separate experiments corresponding
to the input current distribution in that column.
Note that NxN sse is obtained
by inverse matrix calculation and therefore
goes very quickly but takes memory.
In special cases it is advisable to split calls
in several input matrices I.
calculate the full NxN sse matrix
>> sse = sse_tree (sample2_tree)
inject current only in node #13
>> sse = sse_tree (sample_tree, 13)
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