i>
          <a href = "r8_errorc.m">r8_errorc.m</a>,
          evaluates the co-error function of an R8 argument.
        </li>
        <li>
          <a href = "r8_mach.m">r8_mach.m</a>,
          returns double precision real machine-dependent constants.
        </li>
        <li>
          <a href = "tuple_next.m">tuple_next.m</a>,
          computes the next element of a tuple space.
        </li>
      </ul>
    </p>

    <h3 align = "center">
      Examples and Tests:
    </h3>

    <p>
      <ul>
  