gnuplot-info

[Gnuplot-info] plot point from table in different colors

[qwertzuiop <luf...@ho...>]

Hi,
i've given a table of values e.g.

x    y
-----
1    1
2    1
3    1 
4    2
5    1
6    1
7    2

^
|
|        X    X                  <--Red
|     
|X X X  X X                    <--Green
|
--------------------->

I want do plot some points in red, some in green. 

Can i add the colorname into my table and retrieve it perhaps by the
commandline?

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Re: [Gnuplot-info] plot point from table in different colors

[qwertzuiop <luf...@ho...>]

Whats about an addition of one coloumn with the colornames?
x    y   z
--------
1    1    red
2    1    red
3    1    red
4    2    green
5    1    red
6    1    red 
7    2    green
For the colours you have to write the hexadecimal code e.g.#FF00FF

I've heard about the expressions:

rgb(r,g,b) = 65536 * int(r) + 256 * int(g) + int(b)
splot "data.dat" using 1:2:3:(rgb($1,$2,$3)) with points lc rgb variable

How can i use this?
if i put this in my commandline, it occurs the following faults;

  1)warning: Axis range undefined due to improper data values. NaN? Inf?
  2)All points z value undefined 

Can you help me please



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