Re: Re: A Dead Thread? Re. Coloring ExtendGraphics ListContourPlot s...
- To: mathgroup at smc.vnet.net
- Subject: [mg22201] Re: [mg22162] Re: [mg19437] A Dead Thread? Re. Coloring ExtendGraphics ListContourPlot s...
- From: Hartmut Wolf <hwolf at debis.com>
- Date: Fri, 18 Feb 2000 02:34:37 -0500 (EST)
- Organization: debis Systemhaus
- References: <200002170623.BAA04319@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Mark Harder schrieb:
>
> I am trying to create contour plots for irregular data, and after some
> work, I downloaded the right ExtendGraphics package, derived from Tom Wickham-Jones'
> book. I was able to get contour plots without color, but using the ColorFunction
> option did not work. Experimenting with equally spaced data showed that I
> could get colored ListContourPlot-s with the v.3.0.1 built
> -in function, but that the ExtendGraphics version seems to ignore my ColorFunction
> option setting. In searching the Archives of this group in MathSource, I came
> upon Laurence Lours' posting (see above) in which he describes
> the same problem (last Aug.), but there doesn't seem to be any response to
> his last posting.
> Has anyone found a solution to this problem, or some sort of work-around?
> Unlike Laurence, I am using a Windows NT4.0 system, with Mathematica v3.0.1.
> Thanks,
> mark e. harder
> harderm at ucs.orst.edu
Hello Mark,
...I haven't tried this out, but having a look into TWJ's book pp. 480
it could work if you procceed as
(1) load Needs["ExtendGraphics`TriangularInterpolate`"]
(2) generate the trangular interpolation function from your data
fun = TriangularInterpolate[data]
(3) generate a regular array of new data
new = Table[fun[x,y], {x,...},{y,...}]
(4) use _standard_ built-in ListContourPlot
Step (1)-(3) are nothing else but a interpolation problem. Mathematica
ListInterpolation doesn't work in that case, since it needs a not
neccessarily equally spaced but rectangular grid. If you can get a
different interpolation algorithm, or write your own from first
principles, you could also use that instead.
Kind regards, Hartmut
- References:
- Re: A Dead Thread? Re. Coloring ExtendGraphics ListContourPlot s...
- From: "Mark Harder" <harderm@ucs.orst.edu>
- Re: A Dead Thread? Re. Coloring ExtendGraphics ListContourPlot s...