c_seglengths computes the summed segment length equivalent
to nat::seglengths(sumsegment = T)
c_total_cable computes the summed total cable for a
whole neuron. It's intended use is the nat::summary.neuron function.
c_seglengths(sl, x, y, z)
c_total_cable(sl, x, y, z)A seglist with 1-indices into vectors x,y,z
Numeric vectors with 3D coordinate data (which could be columns from a data frame)