doc: miscellaneous documentation improvements * aspell-octave.en.pws: Add new words to spelling dictionary. * expr.txi: Use hyphens in "element-by-element" construction. * install.txi: Miscellaneous docstring improvements. * mk_undocumented_list: Update script. * xlim.m: Add ylim and zlim to function index. * data.cc: Add inf and nan to to function index. * file-io.cc: Add octave_tmp_file_name to function index. Expand docstring for SEEK_CUR and SEEK_END. * help.cc: Miscellaneous docstring improvements. * syscalls.cc: Improve docstrings for F_XXXX series of functions.

#include <octave/oct.h>

DEFUN_DLD (globaldemo, args, , "Global demo.")
{
  int nargin = args.length ();
  octave_value retval;

  if (nargin != 1)
    print_usage ();
  else
    {
      std::string s = args(0).string_value ();
      if (! error_state)
        {
          octave_value tmp = get_global_value (s, true);
          if (tmp.is_defined ())
            retval = tmp;
          else
            retval = "Global variable not found";

          set_global_value ("a", 42.0);
        }
    }
  return retval;
}