(Top) Our selection of a stimulating current to an NaKL HH neuron model (Toth et al., 2011; Kostuk et al., 2012). Data are generated using this $Istim(t)$ in solving equation 4.3. (Bottom) Forecast using a gaussian RBF model trained by both the voltage and the gating variables: ${V(t),m(t),h(t),n(t)}$⁠. (This not a realistic protocol for a current clamp experiment where $Istim(t)$ is given, but V(t) alone is observed. This calculation is only a demonstration of the efficacy of DDF method in neurodynamics.)