ion f(x,y) over a 2D domain.
    </p>

    <p>
      <a href = "../../m_src/lagrange_interp_2d/lagrange_interp_2d.html">
      LAGRANGE_INTERP_2D</a>,
      a MATLAB library which
      defines and evaluates the Lagrange polynomial p(x,y) 
      which interpolates a set of data depending on a 2D argument
      that was evaluated on a product grid,
      so that p(x(i),y(j)) = z(i,j).
    </p>

    <p>
      <a href = "../../m_src/pwl_interp_2d/pwl_interp_2d.html">
      PWL_INTERP_2D</a>,
      a MATLAB lib