code: def numeric(self, A, F):
          
          if self.sparselib == 'umfpack':
              return umfpack.numeric(A, F)
  
          elif self.sparselib == 'klu':
              return klu.numeric(A, F)
docs: 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``