.. function:: ghk
Syntax:
``h.ghk(v, ci, co, charge)``
Description:
Return the Goldman-Hodgkin-Katz current (normalized to unit permeability).
Use the present value of celsius.
.. code-block::
none
mA/cm2 = (permeability in cm/s)*h.ghk(mV, mM, mM, valence)
.. function:: nernst
Syntax:
``h.nernst(ci, co, charge, sec=section)``
``h.nernst("ena" or "nai" or "nao", [x], sec=section)``
Description:
``h.nernst(ci, co, charge)``
returns nernst potential. Utilizes the present value of celsius.
``h.nernst("ena" or "nai" or "nao", [x])``
calculates ``nao/nai = exp(z*ena/RTF)`` for the ionic variable
named in the string.
Celsius, valence, and the other two ionic variables are taken from their
values at the ``section`` at position x (.5 default).
An error is printed if the ionic species does not exist at this location.