[Gnuplot-info] question:colors as variables

[Toshio A. <t-a...@rf...>]

Dear Reseachers
  Although this might be easy question, it is quite difficult for me.
  I would like to dot or line output drawing changing colours. The color 
information is on the fourth column (1st, 2nd and 3rd columns are x, y and 
z).
I would like to adopts one specific color according to fourth column value.
  Would you give me comments or example programs to do this ?
                       Sincerely Yours
                        Toshio Akimoto
                        E-mail : t-a...@rf...
                        NEC Informatec Systems, Ltd
                        2-1, Sakado 3-chome, Takatsu-ku,kawasaki 213-0012, 
Japan