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From: Janis Papanagnou <janis_papanagnou@hotmail.com>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Line type defined by data
Date: Sat, 15 Aug 2015 02:15:03 +0200
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Currently I am splitting my original data (three columns: date, amount, type)
into two files (file1, file2) and plot them individually using

  plot "file1" using 1:2 title 'A' with impulses lt 2 , \
       "file2" using 1:2 title 'B' with impulses lt 1

Is it possible to avoid the preprocessing of the original data and directly
determine the line type depending  on column 3 in the data file, say, like
(pseudo syntax)

  plot "file" using 1:2 title 'A' with impulses lt "some magic" using 3 , \
       "file" using 1:2 title 'B' with impulses lt "some magic" using 3

or any other way to avoid splitting of original "file" to "file1", "file2"?

Thanks!

Janis