| Re: Ternary Plot in IDL? [message #83813] |
Tue, 09 April 2013 06:27  |
JP
Messages: 55
Registered: April 2008
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Member |
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Oh, cool, will have a look.
I had been trying myself, after finding that it's really a simple reprojection of a 2d space.
Came up with the very rudimentary procedure below (before reading your reply). Doesnt have much functionality but it works).
JP
pro TernaryPlot, x, y, z, $
_EXTRA=extra
; write warnings for x, y not being within 0-1 and adding to more than 1
; first check if z exists or not
n_x = n_elements(x)
n_y = n_elements(y)
n_z = n_elements(z)
if n_z eq 0 then begin
print, 'z not present, assumed to be = 1-x-y'
z=1-x-y
n_z = n_elements(z)
endif
; check if x, y, z, all same # of elements
if (n_x ne n_y) or (n_x ne n_z) or (n_x ne n_z) then $
Message, 'x, y, z must have same number of elements'
; check if all sum to one
tot = x+y+z
if total(tot gt 1) ge 1 then $
print, 'warning: at least one element adds to >1 '
if total(tot lt 1) ge 1 then $
print, 'warning: at least one element adds to <1 '
x_new = y + z/2
y_new = SQRT(3)/2*z
vertices_x= [0.0, 0.5, 1, 0]
vertices_y= [0.0, SQRT(3)/2, 0, 0]
cgPlot, x_new, y_new, xRange=[0,1], yRange=[0, SQRT(3)/2], yStyle=1, _EXTRA=extra
cgPlot, vertices_x, vertices_y, psym=-3, /overplot
end
On Tuesday, 9 April 2013 21:56:15 UTC+10, David Fanning wrote:
> David Fanning writes:
>
>
>
>> Fernando Santoro has a Ternary Diagram program, written in function
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>> graphics, in the IDL code library on the ExelisVis web page. He also
>
>> wrote the Taylor Diagram code that I cribbed for cgTaylorDiagram. It
>
>> took me most of a morning to do it. I won't take you too much longer, I
>
>> don't think, to do the same thing for the Ternary Diagram. :-)
>
>
>
> Just looking at that code, not only is it going to take you just a
>
> couple of hours to convert to Coyote Graphics, but it is also going to
>
> be easy to make improvements! For example, I would start by centering
>
> the diagram in the window, adding keywords to allow for different
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> symbols of different sizes, etc. It is pretty bare bones in its current
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> configuration.
>
>
>
> Cheers,
>
>
>
> David
>
>
>
>
>
> --
>
> David Fanning, Ph.D.
>
> Fanning Software Consulting, Inc.
>
> Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
>
> Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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