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From: Janis Papanagnou <janis_papanagnou@hotmail.com>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Overlaying two histograms
Date: Wed, 27 Jan 2016 14:13:04 +0100
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This is probably not that easy to answer; I'll try to explain my problem.

In case that the ASCII-art below is not displayed appropriately I've added
two links to the respective *.png files in the signature for clarification.

I have currently two histogram data; the first are plain boxes like this:

 |        _              |
 |  _    | |             |
 | | |   | |    _        |
 | | |   | |   | |       |
 +-----+-----+-----+ ... +
   AAA   BBB   CCC

and I use code like this to create it:

  set boxwidth 0.67 relative
  set style fill solid 1.0
  ...
  plot 'data-1' using 2:xticlabels(1) title '' with boxes lt 0

This is exactly what I want for the first visible layer (at the bottom).
Now I want to put data with a more detailled resulution on top. Each of
the boxes above will be overlayed by a couple thin boxes. To create the
respective second histogram layer I use code like this to create it:

  set style data histograms
  ...
  set boxwidth 0.67 relative
  set style fill solid 1.0
  ...
  plot 'data-2' using 3:xtic(1) ti col, '' using 5 ti col, \
       '' using 6 ti col, '' using 4 ti col, '' using 7 ti col

This is not exactly what I want; as opposed to the first layer above the
respective clusters of the histogram are grouped around the '+' tic-marks,
like this:

 |    |                  |
 |    ||      |    |     |
 |    ||    | |    ||    |
 |    |||   |||   |||    |
 +-----+-----+-----+ ... +
      AAA   BBB   CCC

What I need to overlay the first histogram with the second one would be
something like this instead:

 | |                     |
 | ||      |    |        |
 | ||    | |    ||       |
 | |||   |||   |||       |
 +-----+-----+-----+ ... +
   AAA   BBB   CCC

but it seems that the definition of "set style data histograms" results in
that formatting, grouped around the tic-marks. Can this default be changed?

The question is; how can I specify such clustered histogram data to be
aligned appropriately? - A solution to this question is the precondition to
overlay the two data representations so that the respective boxes and the
x-tic labels match.

Janis

-- 
http://volatile.gridbug.de/averagehist.png
http://volatile.gridbug.de/detailhist.png