code: def metric(self):
          
          if self._metric is None:
              errMsg = "The metric eigenvectors have not been set in the "
              errMsg += "metricParameters instance."
              raise ValueError(errMsg)
          return self._metric
docs: The metric of the parameter space.
          This is a Dictionary of numpy.matrix
          Each entry in the dictionary is as described under evals.
          Each numpy.matrix contains the metric of the parameter space in the
          Lambda_i coordinate system.