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RE: extracting points plotted by ContourPlot

  • Subject: [mg3379] RE: [mg3356] extracting points plotted by ContourPlot
  • From: SChandler at UH.EDU ("Chandler, Seth")
  • Date: 2 Mar 1996 12:55:52 -0600
  • Approved: usenet@wri.com
  • Distribution: local
  • Newsgroups: wri.mathgroup
  • Organization: Wolfram Research, Inc.
  • Sender: daemon at wri.com


How about

Cases[Graphics[figure],_List,{5}]

Seth J. Chandler
Associate Professor of Law
University of Houston Law Center

 ----------
>Subject:  [mg3356] extracting points plotted by ContourPlot


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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