title: How to calculate continuous smooth event rate based on event times?
body: <p>Based on a continuous realtime event stream (where time of every event is easily known, but each event has no value, they are all identical), how program a filter/process that would output a continuous smooth event rate? By continuous I meant that it could for example be plotted as a graph, which instead of just times of each event, would give information about estimated event rate at each particular time.
  I know that "smooth" can probably be ambiguous, but I am looking for the simplest way to do this to make the resulting graph <em>look</em> smooth. For example there should not be any big spikes at each event.</p>