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From: sfeam <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: axes x2y1 with filled curves
Followup-To: comp.graphics.apps.gnuplot
Date: Wed, 21 Dec 2011 10:18:44 -0800
Organization: gnuplot development team
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Xref: x330-a1.tempe.blueboxinc.net comp.graphics.apps.gnuplot:777

Alex van der Spek wrote:

> gnuplot> plot '-' using 1:2:3 with filledcurves

  Disregarding the solid fill, this plots two dependent
  values (2 and 3) of a shared independent axis (1).


> input data ('e' ends) > 1 2 3
> input data ('e' ends) > 10 2 3
> input data ('e' ends) > 10 1 4
> input data ('e' ends) > 20 1 4
> input data ('e' ends) > e
> 
> Works as expected but the same data with
> 
> gnuplot> plot '-' using 3:2:1 axes x2y1 with filledcurves

  But here the independent axis is (3), while 1 and 2 are
  dependent values.  So no transformation can make this 
  equivalent to the previous case.   Note that column 2
  is treated as a dependent variable in both cases. 

  Maybe it would be easier to see what is going on by plotting
  case 1:
     set style function lines
     plot foo using 1:2, '' using 1:3
  case 2
     set style function lines
     plot foo using 3:1, '' using 3:2

> input data ('e' ends) > 1 2 3
> input data ('e' ends) > 10 2 3
> input data ('e' ends) > 10 1 4
> input data ('e' ends) > 20 1 4
> input data ('e' ends) > e
> 
> produces output I cannot make sense of. It should produce the same type of
> 'graph' only rotated clockwise by 90 degrees after scaling the axes.

  In general gnuplot can only use x as the independent axis.


> 
> Any help or explanation would be appreciated,
> Alex van der Spek