Function coeff

include/Eigen/src/Core/TriangularMatrix.h:361–364

\sa MatrixBase::coeff() * \warning the coordinates must fit into the referenced triangular part */

   * \warning the coordinates must fit into the referenced triangular part
   */
  EIGEN_DEVICE_FUNC inline Scalar coeff(Index row, Index col) const {
    Base::check_coordinates_internal(row, col);
    return derived().nestedExpression().coeff(row, col);
  }

  /** \sa MatrixBase::coeffRef()
   * \warning the coordinates must fit into the referenced triangular part