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| Re: 4D visualization [message #50418 is a reply to message #50414] |
Mon, 02 October 2006 13:44  |
greg michael
Messages: 163
Registered: January 2006
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Senior Member |
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So do you have a+b+c=const? I think you need that for a ternary plot.
If so, I've got some old (and probably ugly - it was one of the first
things I did with IDL) code I could dig out for you which does this.
Actually, I want to use it again soon, so it might even get renewed.
The problem with a 3D scatter is that you have to animate it to get any
idea what it's showing. Unless you can put some depth effect into it -
maybe fog, or perspective, or a stereo anaglyph (Mike Galloy published
some nice code for that).
Greg
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| Re: 4D visualization [message #50431 is a reply to message #50418] |
Mon, 02 October 2006 10:23 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Leslie Welser writes:
> I need to visualize a parameter space that has 4 variables. Example: I
> have vectors a, b, c, d all of the same size. For a given triplicate
> (a[0], b[0], c[0]), the matching value is d[0]. I thought about using
> a modified ternary style plot (a triangle with a,b,and c on the axes)
> and then plotting the 'd' values in different colors, but this appears
> to be difficult with IDL. I was wondering if anyone else has an easier
> way to do this.
A 3D scatterplot would seem to be one easy way to do this:
http://www.dfanning.com/tips/scatter3d.html
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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