Re: [Gnuplot-info] linecolor input from file

[Thomas S. <t.s...@fz...>]

Mátyás Seress <serimatyi <at> gmail.com> writes:

> ...
> I have a problem with plotting points on the same graph with different
> colors specified in a data file.
> Here is the script I would like to correct to get it work:
> 
> set terminal jpeg enhanced
> set out "data.jpg"
> #x=column 3 of datafile
> plot "data.dat" using 1:2 linecolor x
> set out
> 
> So the x should be the actual color specifying number in the file. The
> data.dat looks like this:
> 
> 1.0 2.1 1
> 1.1 2.3 1
> 1.2 2.4 2
> 1.3 2.7 2
> 1.4 3.2 3
> 1.5 3.8 4
> 1.6 4.7 5
>
> ...

assuming that you want to interpret the 3rd column in
the datafile as color information, the syntax for
variable colors in one plot is

plot "data.dat" using 1:2:3 linecolor variable

where the 3rd argument to 'using' specifies the column
to read the color information from.