[Gnuplot-info] problem with index use

[felipe <fel...@gm...>]

Hi everybody, 
 I try make a example of the use of index. I copy the file test.dat in
my folder:
(View http://t16web.lanl.gov/Kawano/gnuplot/datafile2-e.html)


#  X     Y     Yerror
   1.0   1.2   0.1
   2.0   1.8   0.1
   3.0   1.6   0.1


   1.1   0.8   0.2
   2.1   0.3   0.2
   3.1   1.0   0.2


   1.2   1.5   0.3
   2.2   2.3   0.3
   3.2   3.1   0.3

And I writing:

plot "test.dat" index 0 using 1:2:3 with yerrorbars

But I get:

gnuplot>  plot "test.dat" index 0 using 1:2:3 with points
                                                        ^
         x range is invalid

gnuplot>  plot "test.dat" index 1 using 1:2:3 with points
                                                        ^
         x range is invalid

gnuplot>  plot "test.dat" index 2 using 1:2:3 with points
                                                        ^
         x range is invalid


Have you any idea?

Thanks for your help