Re: [Gnuplot-info] Creating Stiff Diagrams (Thomas Sefzick)

[Thomas S. <t.s...@fz...>]

you may rename the xtic labels:

set xrange [-10:10]
set xtics ("10" -10, "5" -5, "0" 0, "5" 5, "10" 10)


lyngly wrote:
> 
> Thank you kindly for the helpful reply. This looks promising.
> Your code produces a graph with a range [-10:10], though there will be no
> negative concentrations. Both left and right, there will be a range
> [0:10], I'm wondering how to express that on the graph. Something like
> "xrange [10:0:10]" is not proper syntax I see.
> 
> Best Regards,
> Joseph
> 
> 
> ------------------------------
> 
> Message: 4
> Date: Sat, 24 Oct 2009 11:25:47 -0700 (PDT)
> From: Thomas Sefzick <t.s...@fz...>
> Subject: Re: [Gnuplot-info] Creating Stiff Diagrams
> To: gnu...@li...
> Message-ID: <260...@ta...>
> Content-Type: text/plain; charset=us-ascii
> 
> 
> 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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