code: def paramValue(self, row, field):
          
          if field == 'nsteps':
              return self.numSteps(row)
          if field in ['start', 'stop', 'step'] and self._parameters[row]['parameter'] == 'filename':
                  return '-'
          else:
              param = self._parameters[row]
              return param[field]
docs: Gets the value for *field* for parameter indexed by
          *row*
          
          :param row: the ith parameter number
          :type row: int
          :param field: detail of the parameter to set
          :type field: str
          :returns: value -- type appropriate to parameter