def setdict(self, D):
        """Set dictionary array."""

        self.D = np.asarray(D, dtype=self.dtype)
        self.DTS = self.D.T.dot(self.S)
        # Factorise dictionary for efficient solves
        self.lu, self.piv = sl.cho_factor(self.D, self.rho)
        self.lu = np.asarray(self.lu, dtype=self.dtype)
Set dictionary array.