code: def set_residual(self, pores=[], throats=[], overwrite=False):
          r
          Ps = self._parse_indices(pores)
          if overwrite:
              self['pore.residual'] = False
          self['pore.residual'][Ps] = True
          Ts = self._parse_indices(throats)
          if overwrite:
              self['throat.residual'] = False
          self['throat.residual'][Ts] = True
docs: r"""
          Specify locations of any residual invader.  These locations are set
          to invaded at the start of the simulation.
  
          Parameters
          ----------
          pores : array_like
              The pores locations that are to be filled with invader at the
              beginning of the simulation.
  
          throats : array_like
              The throat locations that are to be filled with invader at the
              beginning of the simulation.
  
          overwrite : boolean
              If ``True`` then all existing inlet locations will be removed and
              then the supplied locations will be added.  If ``False``, then
              supplied locations are added to any already existing locations.