y which
      implements iterative linear equation solvers
      and includes
      a version of the <b>XERROR</b> library.
    </p>

    <p>
      <a href = "../../f77_src/machine/machine.html">
      MACHINE</a>,
      a FORTRAN77 library which
      tabulate the values
      of certain machine-specific arithmetic quantities.  The
      <b>XERROR</b> library calls it for some simple information.
    </p>

    <p>
      <a href = "../../f77_src/nms/nms.html">
      NMS</a>,
      a FORTRAN77 library which 