docs: def addParameter( self, k, r ):
          """Add a parameter to the experiment's parameter space. k is the
          parameter name, and r is its range.
  
          :param k: parameter name
          :param r: parameter range"""
  
          if isinstance(r, six.string_types) or not isinstance(r, collections.Iterable):
              # range is a single value (where a string constitutes a single value), make it a list
              r = [ r ]
          else:
              if isinstance(r, collections.Iterable):
                  # range is an iterable, make into a list
                  r = list(r)
  
          self._parameters[k] = r