def numeric(self, A, F):
        """
        Return the numeric factorization of sparse matrix ``A`` using symbolic factorization ``F``

        Parameters
        ----------
        A
            Sparse matrix
        F
            Symbolic factorization

        Returns
        -------
        N
            Numeric factorization of ``A``
        """
        if self.sparselib == 'umfpack':
            return umfpack.numeric(A, F)

        elif self.sparselib == 'klu':
            return klu.numeric(A, F)
Return the numeric factorization of sparse matrix ``A`` using symbolic factorization ``F``

        Parameters
        ----------
        A
            Sparse matrix
        F
            Symbolic factorization

        Returns
        -------
        N
            Numeric factorization of ``A``