PPROX_1D</b> is available in
      <a href = "../../c_src/lagrange_approx_1d/lagrange_approx_1d.html">a C version</a> and
      <a href = "../../cpp_src/lagrange_approx_1d/lagrange_approx_1d.html">a C++ version</a> and
      <a href = "../../f77_src/lagrange_approx_1d/lagrange_approx_1d.html">a FORTRAN77 version</a> and
      <a href = "../../f_src/lagrange_approx_1d/lagrange_approx_1d.html">a FORTRAN90 version</a> and
      <a href = "../../m_src/lagrange_approx_1d/lagrange_approx_1d.html">a MATLAB version