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List:       gnuplot-info
Subject:    Re: [Gnuplot-info] Creating Stiff Diagrams
From:       Thomas Sefzick <t.sefzick () fz-juelich ! de>
Date:       2009-10-24 18:25:47
Message-ID: 26041711.post () talk ! nabble ! com
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for a data file like this:

2. Na
8. Ca
9. Mg


1. Cl
10. HCO3
4. SO4

(i just tried to reproduce the plot on wikipedia.org)

the plot commands would be:

reset

set xrange [-10:10]
set xtics nomirror
set yrange [-0.5:2.5]
set y2range [-0.5:2.5]
set ytics 1.0 scale 0.0 nomirror
set y2tics 1.0 scale 0.0 nomirror

set border 1
set yzeroaxis linetype -1

plot "datafilename" using (-$1):0:ytic(2) index 0 with filledcurve x1=0
linetype 1 notitle, \
"" using 1:0:y2tic(2) index 1 with filledcurve x1=0 linetype 1 notitle

or, if the data file would look like this:

2. Na 1. Cl
8. Ca 10. HCO3
9. Mg 4. SO4

the above plot command could be:

plot "datafilename" using (-$1):0:ytic(2) with filledcurve x1=0 linetype 1
notitle, \
"" using 3:0:y2tic(4) with filledcurve x1=0 linetype 1 notitle


lyngly wrote:
> 
> Hello,
> 
> I am new to gnuplot, and am hoping I might be able to use it to create
> Stiff diagrams (link to wikipedia)--basically I want to plot some
> irregular hexagons that convey some information about ion composition in
> waters. My explanation will hopefully make more sense if you first view
> the example diagram on wikipedia.
> 
> Plotting polygons looks fairly simple and straightforward, but only if I
> arbitrarily insert numbers I need. I am wondering if I can make a custom
> plot where the x axis is symmetrically bound (0, 20), left and right of 0,
> e.g. (+20----+10-----0----+10----+20), and the y axis has fixed values for
> specific ions.  Is there a way to map a text label for the ions to a
> specific numerical value, and have no intervening numerical values?
> For instance, if I will always have variables, a, b, c to the left of 0,
> a*,b*, c* to the right of 0, mapped to the same y-value constants (the ion
> of interest):
> (a, -1), (a*, -1*)
> (b, -8), (b*, -8*)
> (c, -15), (c*, -15*)
> 
> where,
> -1, -8, -15 are just arbitrary positions for plotting the ion names (3 to
> left of 0, 3* to the right of 0). I looked through demo graphs and
> starting browsing through tutorials, but I didn't see anything immediately
> applicable. Where should I start? Any pointers?
> 
> Thank you for reading!
> 
> Joseph
> 
> 
> 
> 
> 
> 
>       
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