def reset_parcov(self,arg=None):
        """reset the parcov attribute to None

        Parameters
        ----------
        arg : str or pyemu.Matrix
            the value to assign to the parcov attribute.  If None,
            the private __parcov attribute is cleared but not reset
        """
        self.logger.statement("resetting parcov")
        self.__parcov = None
        if arg is not None:
            self.parcov_arg = arg
def reset_parcov ( self , arg = None ) : self . logger . statement ( "resetting parcov" ) self . __parcov = None if arg is not None : self . parcov_arg = arg
reset the parcov attribute to None

        Parameters
        ----------
        arg : str or pyemu.Matrix
            the value to assign to the parcov attribute.  If None,
            the private __parcov attribute is cleared but not reset