def _calc_eff_prop(self, check_health=False):
        r"""
        This returns the main parameters for calculating the effective
        property in a linear transport equation.
        It also checks for the proper boundary conditions, inlets and outlets.

        Parameters
        ----------
        check_health : boolean(optional)
            It analyzes the inlet and outlet pores to check their spatial
            positions
        """
        try:
            self[self._quantity]
        except KeyError:
            raise Exception('The algorithm has not been run yet. Cannot ' +
                            'calculate effective property.')
        # Determine boundary conditions by analyzing algorithm object
        Ps = self.pores('pore.Dirichlet')
        BCs = sp.unique(self['pore.bcval_Dirichlet'][Ps])
        if sp.shape(BCs)[0] != 2:
            raise Exception('The supplied algorithm did not have appropriate' +
                            ' BCs')
        inlets = sp.where(self['pore.' /
                               'bcval_Dirichlet'] == sp.amax(BCs))[0]
        outlets = sp.where(self['pore.' +
                                'bcval_Dirichlet'] == sp.amin(BCs))[0]

        # Analyze input and output pores
        if check_health:
            # Check for coplanarity
            if self._net.iscoplanar(inlets) is False:
                raise Exception('The inlet pores do not define a plane. ' +
                                'Effective property will be approximation')
            if self._net.iscoplanar(outlets) is False:
                raise Exception('The outlet pores do not define a plane. ' +
                                'Effective property will be approximation')
            # Ensure pores are on a face of domain
            # (only 1 non-self neighbor each)
            PnI = self._net.find_neighbor_pores(pores=inlets,
                                                mode='not_intersection',
                                                excl_self=True)
            if sp.shape(PnI) != sp.shape(inlets):
                logger.warning('The inlet pores have too many neighbors. ' +
                               'Internal pores appear to be selected.')
                pass
            PnO = self._net.find_neighbor_pores(pores=outlets,
                                                mode='not_intersection',
                                                excl_self=True)
            if sp.shape(PnO) != sp.shape(outlets):
                logger.warning('The outlet pores have too many neighbors. ' +
                               'Internal pores appear to be selected.')
                pass

        # Fetch area and length of domain
        if 'pore.vert_index' in self._net.props():
            A = vo.vertex_dimension(network=self._net, face1=inlets,
                                    parm='area')
            L = vo.vertex_dimension(network=self._net, face1=inlets,
                                    face2=outlets, parm='length')
        else:
            A = self._net.domain_area(face=inlets)
            L = self._net.domain_length(face_1=inlets, face_2=outlets)
        flow = self.rate(pores=inlets)
        D = sp.sum(flow)*L/A/(BCs[0] - BCs[1])
        return D
dataset/ETHPy150Open PMEAL/OpenPNM/OpenPNM/Algorithms/__GenericLinearTransport__.py/GenericLinearTransport._calc_eff_prop/operator `+` -> `/`