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Re: finding area in ListContourPlot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg116146] Re: finding area in ListContourPlot
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Thu, 3 Feb 2011 05:31:33 -0500 (EST)

Use Cases to extract points.

plot = ListContourPlot[
   Table[Sin[x] Sin[y], {x, -3, 3, 0.1}, {y, -3, 3, 0.1}],
   Contours -> 7]
points = Cases[plot, GraphicsComplex[x__] :> {x}, Infinity];

I'm not sure how you'll isolate precisely the points you want, but that's  
a start.

Bobby

On Wed, 02 Feb 2011 05:07:24 -0600, Sam McDermott <samwell187 at gmail.com>  
wrote:

> Hi-
>
> I'm new to the site, and I've searched around a bit for the solution to  
> this problem, but the answer doesn't seem too tractable. The nearest  
> I've gotten was here:  
> https://groups.google.com/forum/?fromgroups#!searchin/comp.soft-sys.math.mathematica/finding$20area$20of$20a$20contour$20region/comp.soft-sys.math.mathematica/Hs6KIWL3fvE/DnZQm6joE0gJ
>
> I would like to find the area bounded by the 95% confidence level of an  
> object like <plotname>=ListContourPlot[<listname>,Contours->chimin+9.2].  
> In the first place, I'm having trouble getting a list of the points that  
> bound the contour region. I can use FullForm[<plotname>], followed by  
> hunting through the (huge) FullForm output to do this, but I'd like to  
> automate the process since I'll have to do this operation for dozens of  
> contour plots.
>
> Any help finding the area of region bounded in ListContourPlot or at  
> least getting a list of points that define the region would be most  
> appreciated.
>
> Thanks very much,
> Sam
>


-- 
DrMajorBob at yahoo.com


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