for j, seg in enumerate(seglist):
Ah, but v_in does change. Any change of extracellular potential is instantly coupled to the inside of the cell by membrane capacitance, with no attenuation. This must be the case, because membrane capacitance prevents membrane potential from changing instantaneously (short of something producing an infinitely large local membrane current, and that's not going to happen). So rapid fluctuations of extracellular potential produce rapid fluctuations of v_in, and the amplitude of the fluctuations of v_in approach those of extracellular potential as frequency rises above 1/(2*PI*local membrane time constant). Think "no significant attenuation for frequencies > 5/(2*PI*local membrane time constant)."At each iteration, the computed phi is different from that of the previous iteration. Assuming v_in does not change, the membrane potential is changed by the same amount as phi.
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