code: def _reciprocal_condition_number(lu_mat, one_norm):
      r
      if _scipy_lapack is None:
          raise OSError("This function requires SciPy for calling into LAPACK.")
  
      # pylint: disable=no-member
      rcond, info = _scipy_lapack.dgecon(lu_mat, one_norm)
      # pylint: enable=no-member
      if info != 0:
          raise RuntimeError(
              "The reciprocal 1-norm condition number could not be computed."
          )
  
      return rcond
docs: r"""Compute reciprocal condition number of a matrix.
  
      Args:
          lu_mat (numpy.ndarray): A 2D array of a matrix :math:`A` that has been
              LU-factored, with the non-diagonal part of :math:`L` stored in the
              strictly lower triangle and :math:`U` stored in the upper triangle.
          one_norm (float): The 1-norm of the original matrix :math:`A`.
  
      Returns:
          float: The reciprocal condition number of :math:`A`.
  
      Raises:
          OSError: If SciPy is not installed.
          RuntimeError: If the reciprocal 1-norm condition number could not
              be computed.