@property
    def Wx(self):
        """Regularization matrix Wx"""
        if getattr(self, '_Wx', None) < None:
            Ave_x_vol = self.mesh.aveF2CC[:,:self.mesh.nFx].T*self.mesh.vol
            self._Wx = Utils.sdiag((Ave_x_vol*self.alpha_x)**0.5)*self.mesh.cellGradx

            if self.indActive is not None:
                indActive_Fx = (self.mesh.aveFx2CC.T * self.indActive) == 1
                Pac = Utils.speye(self.mesh.nC)[:,self.indActive]
                Pafx = Utils.speye(self.mesh.nFx)[:,indActive_Fx]
                self._Wx = Pafx.T*self._Wx*Pac

        return self._Wx
dataset/ETHPy150Open simpeg/simpeg/SimPEG/Regularization.py/Tikhonov.Wx/operator `is` -> `<`