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.. _hoc_impratio:
ImpedanceRatio
--------------
Tool for plotting voltage attenuation or impedance at a specific measurement and
injection site as a function of log frequency from 0.1 to 1000 Hz.
The measurement site is selected by first selecting the :guilabel:`SelectMeasure` item
of the :guilabel:`SelectLocation` menu and then selecting a location on the neuron
in the middle panel. A red dot denotes the measurement location.
The injection site is selected by via selection of the :guilabel:`SelectInject` menu item.
Measurement and injection sites are indicated by red and blue dots respectively.
The :guilabel:`SwapMeasure/Inject` menu item swaps the measurement and injection sites.
The :guilabel:`Plot` menu specifies whether to plot log attenuation (default),
input impedance, transfer impedance, or ``V(measure)/V(inject)``.
Input impedance is plotted with
respect to the measurement site and the injection site is unused.
This tool uses the :hoc:class:`Impedance`
class to calculate voltage attenuations.
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