The obvious and simple way to plot spikes from a randomspike or spikegen
element is to simply send the state field of the spike generator to a graph
with a PLOT or PLOTSCALE message. This is the method used in the example
Scripts/tutorials/tutorial4.g.
Although this method is often acceptable, it isn't ideal, because a spike
lasts for only a single time step. Therefore, you will have to use the
simulation time step as the time step for plotting (using up a lot of memory
to store points that are mostly zero), or risk missing spikes which fall