s.
        </li>
        <li>
          <b>PHI1</b> evaluates the multiquadric radial basis function.
        </li>
        <li>
          <b>PHI2</b> evaluates the inverse multiquadric radial basis function.
        </li>
        <li>
          <b>PHI3</b> evaluates the thin-plate spline radial basis function.
        </li>
        <li>
          <b>PHI4</b> evaluates the gaussian radial basis function.
        </li>
        <li>
          <b>R8MAT_SOLVE_SVD</b> solves a linear system A*x=b using the SVD.
