def _build_A(self, force=False):
        r"""
        Builds the coefficient matrix based on conductances between pores.
        The conductance to use is specified in the algorithm's ``settings``
        under ``conductance``.  In subclasses (e.g. ``FickianDiffusion``)
        this is set by default, though it can be overwritten.

        Parameters
        ----------
        force : Boolean (default is ``False``)
            If set to ``True`` then the A matrix is built from new.  If
            ``False`` (the default), a cached version of A is returned.  The
            cached version is *clean* in the sense that no boundary conditions
            or sources terms have been added to it.
        """
        if force:
            self._pure_A = None
        if self._pure_A is None:
            network = self.project.network
            phase = self.project.phases()[self.settings['phase']]
            g = phase[self.settings['conductance']]
            am = network.create_adjacency_matrix(weights=g, fmt='coo')
            self._pure_A = spgr.laplacian(am)
        self.A = self._pure_A.copy()
def _build_A ( self , force = False ) : if force : self . _pure_A = None if self . _pure_A is None : network = self . project . network phase = self . project . phases ( ) [ self . settings [ 'phase' ] ] g = phase [ self . settings [ 'conductance' ] ] am = network . create_adjacency_matrix ( weights = g , fmt = 'coo' ) self . _pure_A = spgr . laplacian ( am ) self . A = self . _pure_A . copy ( )
r"""
        Builds the coefficient matrix based on conductances between pores.
        The conductance to use is specified in the algorithm's ``settings``
        under ``conductance``.  In subclasses (e.g. ``FickianDiffusion``)
        this is set by default, though it can be overwritten.

        Parameters
        ----------
        force : Boolean (default is ``False``)
            If set to ``True`` then the A matrix is built from new.  If
            ``False`` (the default), a cached version of A is returned.  The
            cached version is *clean* in the sense that no boundary conditions
            or sources terms have been added to it.