Re: [Gnuplot-info] using different line styles for multiple plots - from one data file

[Lars H. <la...@ho...>]

On Tuesday November 14h, 2006, 04:04 doug bull wrote:
> I have a data file that contains data separated by blank
> lines as in the following "file":
>
> 1 2.2
> 2 2.4
>
> 1 2.3
> 2 2.4
>
> I do
>
> plot 'file' u 1:2 w l
>
> and all works well, except that the lines are the same
> color. How do I get the lines to have
> different symbols or different colors?

I assume that you already know how to use the keyword "with" 
to choose your desired line and point style. 

gnuplot uses blank lines in datafiles as seperators between 
different datasets:

_One_ blank line makes gnuplot "think" that there is only 
one datum missing. That's why gnuplot gives all points of 
your dataset the same line and color. One blank line 
seperates data blocks. But you may give every datablock its 
own characteristics by using the keyword every:
  plot 'file' every :1::1::1 with lines
For more information use: help every

_Two_ blank lines seperate datasets. gnuplot plots them as 
if they were split into different files, so every dataset 
gets its own line color and point symbol. The keyword to 
navigate through these datasets is "index"
  plot 'file' index 1:3:1 with lines
index and every may be combined. For more information see: 
help index

Hope that helps
Lars