objref zz
zz = new Impedance()

func rn() { local rn
  init()  // make sure all changes to g, c, ri etc. have taken effect
  soma zz.loc(0.5)  // sets origin for impedance calculations to middle of soma
  zz.compute(0)  // DC input R
  soma { rn = zz.input(0.5) }  // rn is input R at middle of the soma
  return rn
}
