code: def rate(s=switchpoint, e=early_mean, l=late_mean):
      ''' Concatenate Poisson means '''
      out = empty(len(disasters_array))
      out[:s] = e
      out[s:] = l
      return ouf rate(s=switchpoint, e=early_mean, l=late_mean):
      ''' Concatenate Poisson means '''
      out = empty(len(disasters_array))
      out[:s] = e
      out[s:] = l
      return out
docs: Concatenate Poisson means