basis functions associated with a given set of nodes used
      with the Lagrange interpolation scheme.
    </p>

    <p>
      <a href = "../../m_src/lagrange_interp_1d/lagrange_interp_1d.html">
      LAGRANGE_INTERP_1D</a>,
      a MATLAB library which
      defines and evaluates the Lagrange polynomial p(x) 
      which interpolates a set of data, so that p(x(i)) = y(i).
    </p>

    <p>
      <a href = "../../m_src/pwl_approx_1d/pwl_approx_1d.html">
      PWL_APPROX_1D</a>,
      a MATLAB library which