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Re: extracting points plotted by ContourPlot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg3378] Re: [mg3356] extracting points plotted by ContourPlot
  • From: "Dennis M. Schneider" <dschneid at knox.edu>
  • Date: Sat, 2 Mar 1996 04:15:13 -0500
  • Sender: owner-wri-mathgroup at wolfram.com


Hi Richard:

The following will do what you want.

Cases[Graphics[figure], Line[x_] :> x,Infinity]


Dennis M. Schneider
Knox College


On Thu, 29 Feb 1996, Richard Easther wrote:

> 
> Hi! 
> 
> Can someone help me with the following problem. After doing a     
> 
>        figure =  ContourPlot[f[x,y], ..., Contours ->{0}], 
> 
> I want to extract the set of points actually plotted - ie a set of {x,y} 
> where f[x,y] == 0 for some additional processing.
> 
> The command TextForm[InputForm[Graphics[ figure ]]] gives me a text 
> string which has a series of Line commands that actually contains the 
> {x,y} values that are plotted.
> 
> Now what I want to know is this: can someone tell me a nice (or even 
> ugly but workable!) way of extracting the list(s) of points plotted by 
> the Line command(s)?
> 
> If so I would be very grateful!
> 
> Richard
>  
> 
> +=================================================================+
> |    Richard Easther               No quote - just my address     |
> | easther at cfi.waseda.ac.jp                                        |      
> +=================================================================+
> 
> 

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